MIDTERM EXAM REVIEW
 When an object is in free fall….
 a. It always has an acceleration of 10 m/s2
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downward
b. It is travelling a greater distance each successive
second
c.Its velocity is changing by -10 m/s every second
d. It is not under the influence of anything except
gravity
e. all of the above.
 ____A car starts from rest and after 7 seconds
it is moving at 42 m/s. What is the car’s
average acceleration?
 a. 0.17 m/s2 b. 1.67 m/s2 c. 6 m/s2
 d. 7 m/s2 e. none of these
 A ball is thrown upwards with a velocity of 40
m/s and caught when it comes back down. If
there is no air resistance, the velocity of the
ball at its highest point would be
 a. 10 m/s
b. 10 m/s2 c. 0 m/s
m/s e. -10 m/s
d. 40
If a skydiver jumps out of a plane he will
eventually stop accelerating (before the
parachute is opened), This happens because….
 a. He keeps the same speed as he jumped out of
the plane with the entire time he’s falling
 b. The skydiver will keep on accelerating until the
parachute is opened or he hits the ground
 c. The air resistance will eventually become so
strong that gravity no longer accelerates him, and
he reaches terminal velocity
 d. Because terminal velocity is reached once the
skydiver is travelling at the speed of sound
 ___Suppose a jumper claims a hang time of 2
seconds when jumping straight up. Then that
jumper must be able to leave the ground with
a speed of
 a. 10 m/s.
 b. 5 m/s.
 c. 1 m/s.
 d.
 e.
30 m/s.
20 m/s.
 Suppose a small plane can fly at 170 km/h
relative to the surrounding air. Suppose also that
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there is a 60 km/h headwind (a wind blowing in
the opposite direction as the plane is flying).
How fast does an observer on the ground see the
plane go?
a.110 km/h
b. 230 km/h
c. 60 km/h
d. 170 km/h
e. 5 km/h
 A 10 kg object is accelerated from rest to a
speed of 4 m/s, how much work was done on
the object?
 a. 80 J
 b. 40 J
 c. 2.5 J
 d. 400 J
What is the equation for
Momentum?
 According to Newton’s 2nd Law What is the
relationship between mass and acceleration?
 ____ A ball tossed vertically upward rises,
reaches its highest point, and then falls back
to its starting point. During this time the
acceleration of the ball is always
 a. in the direction of motion.
 b. directed upward.
 c. opposite its velocity.
 d.
directed downward.
 ____The reason padded dashboards are used
in cars is that they
 a.increase the force of impact in a collision.
 b.decrease the momentum of a collision.
 c.increase the time of impact in a collision.
 d.look nice and feel good.
 e.decrease the impulse in a collision.
 ____ Superman and a very massive asteroid
are both at rest in space, if superman throws
the asteroid, which of the two objects will
most faster, Superman or the asteroid?
 a. They both move at the same speed.
 b. The asteroid
 c. Superman
A 4.0-kg ball has a momentum of 20.0 kg·m/s.
What is the ball's speed?
 a. 80.0 m/s
 b. 5.0 m/s
 c. 0.2 m/s
 d. 20.0 m/s
 e. none of the above
 The change in momentum of an object is
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equal to the
a. velocity change of the object.
b. object's mass times the force acting on it.
c. force acting on it times its velocity.
d. force acting on it.
e. impulse acting on it.
 ____ Compared to a sports car moving at
30 miles per hour, the same sports car
moving at 60 miles per hour has
 a. four times as much momentum.
 b. twice as much momentum.
 c. the same momentum.
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If a 1 kg glider moving at 2 m/s collides inelastically with another glider of the
same mass that was initially at rest
2 m/s
1 kg
1 kg
____ 22. What was the initial momentum of the entire system (both carts)
a. 2 kg m/s
b. 4 kg m/s c. 3 kg m/s
0 kg m/s
d.
____ 23. What is the final momentum of the entire system (both carts)?
a. 2 kg m/s
b. 4 kg m/s c. 3 kg m/s
0 kg m/s
d.
____ 24. What is the velocity of the two combined carts after the collision?
a. 0 m/s b. 1 m/s c. 1.5 m/s d. 2 m/s
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True/False
Indicate whether the sentence or statement is true or false.
____ 27. Impulse is defined as the force exerted on an object times the time it
lasts.
____ 28. When a baseball player follows through in hitting the ball, the contact
time with the ball is longer.
____ 29. When two objects collide and stick together, the collision is said to be
inelastic.
____ 30. If a net force acts on a system, the system's momentum will change.
_____ 33. Impulse is equal to the change in momentum
 The mass of a sheep that weighs 110 N is
about
 a. 1100 kg.
 b.
11 kg.
 c. 110 kg.
 d. 1 kg.
 e. none of the above
 The center of gravity of a human body is
located at a point
 a. that can change depending on how the body is
oriented.
 b. that is always directly behind the belly button,
no matter how the body is oriented
 c. that is fixed no matter what.
 d. none of the above
 ___Earth pulls on the moon, and similarly the
moon pulls on Earth. This is evidence that the
 a.
Earth's and moon's pulls comprise an actionreaction pair.
 b.Earth and moon are simply pulling on each
other.
 c.both a and b
 d.neither a or b
Two gliders having the same mass and the
same speed move toward each other on an
air track and stick together. After the
collision, the velocity of the gliders is
 a. There is not enough information to say.
 b. the same as the original velocity.
 c. zero.
 d. one half the original velocity.
 e. twice the original velocity.
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28.
A ball is thrown directly upward at a speed of 30 m/s, how long will it take to reach its highest point?
 A ball is thrown directly upward at a speed of
30 m/s, how long will it take to reach its
highest point?
 a. 1 sec
 c. 4 sec
 b. 3 sec
 d. 6 sec
 An object thrown into the air with a spin
rotates about its
 a. geometric center.
 b.
center of gravity.
 c. edge.
 d. none of the above
 e. midpoint.
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 In an elevator that is accelerating in the
downward direction, you will feel as if you
weigh ______ but in actuality you will weigh
____________.
 a. Less, more
 b. More, less
 c. The same, more d. less, the same
 ____
11. When you release the open
end of a balloon the balloon will fly across the
room, which of Newton’s Laws best explains
this?
 a.
 1st Law b. 2nd Law
c. 3rd Law
 A 5-N force and a 30-N force act in the same
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direction on a 7 kg object. What is the
acceleration of the object?
a.35 m/s2
b. 5 m/s2
c. 7 m/s2
d. 3.57 m/s2
 A tennis ball and a bowling ball are dropped
at the same time. Which ball has the greater
gravitational force acting on it?
 a. The bowling ball
 b. The tennis ball
 c. They both have the same force acting on them.
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 Once a satellite is put into orbit in outer
space it will stay in orbit forever moving at a
constant speed without engines ever firing,
which of Newton’s Laws accounts for this?
 a. 1st Law
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b. 2nd Law
c. 3rd Law
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____ True/False
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Indicate whether the sentence or statement is true or false.
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____ 33.
each other.
Friction refers to the force between two surfaces that are sliding past
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____ 34. If a hockey puck were to slide on a perfectly frictionless surface, it will
eventually slow down because of its inertia.
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____ 35. The acceleration of an object is inversely proportional to the net force acting
on it.
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____ 36. How heavy you ‘feel’ depends on the normal force acting on you, not your
actual weight.
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____ 37. If you were riding in a car that was moving at a constant velocity and threw a
baseball straight up, it would land in the back of the car.
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____ 38. The force due to gravity acting on an object is also referred to as its mass.
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____ 39. Whenever one object exerts a force on another object, the second object
always exerts a force back on the first object.
 If a rider in a car does not have her seatbelt
on and the car get into a head on collision the
rider will likely be thrown forward through
the windshield, this is an example of
Newton’s _____ Law.
 1st
b. 2nd c. 3rd
d. 4th
 ____ A vector is a quantity that has
 a.
magnitude and time
b. time and
direction c. magnitude and direction
 _____5. The horizontal component of a
projectile's velocity is never affected by
 a. a horizontal wind
 b. gravity
 c. the vertical component of its velocity.
d. b & c
 In the absence of air resistance, the angle
at which a thrown ball will go the farthest is
 a. 15⁰
b. 30⁰
c. 45⁰
d. 60⁰
e. 75⁰
 A baseball is hurled into the air at an angle of 30
degrees above the horizontal and lands on a
target that is at the same level as that where the
baseball started. The baseball will also land on
the target if it is thrown at an angle of
 a. 20⁰ b. 40⁰
c. 50⁰ d. 60⁰ e. none of
the above
 Suppose a small plane can fly at 170 km/h in
the North direction. Suppose also that
there is a 60 km/h Northern wind. What is
the plane’s resultant velocity?
 5 km/h
b. 60 km/h
c. 110 km/h
d.170 km/h e. 230 km/h
 What is the resultant of the two vectors 75
km East & 25 km West?
 100 km East b. 100 km West c. 50 km
East d. 50 km West e.25 km West
 City B is directly East of City A. If a plane
wishes to travel from City A to City B while
there is a strong wind that is directed
North, in which direction should the plane
direct itself so that it winds up in City B?
A
B
 A projectile is launched upward at some
angle. If it takes 6 seconds to reach its
highest point, what was its initial vertical
velocity?
 A bomber plane, flying at a high speed, is
planning to drop a bomb onto a city, in
order to hit the city when should the
bomber release the bomb.
 a. Before it reaches the city
 b. after it passes the city
 c. when its directly above the city
 True/False Indicate whether the sentence or
statement is true or false.
 ____
22. Mass is a vector quantity.
 ____
23. A single vector can be replaced by
two vectors in the x- and y-directions that are at right
angles to each other.
 ____
24. If a ball is thrown at an angle of 70
degrees, it’s x-component of velocity is larger than its
y-component of velocity.
 ____
25. Speed is a vector quantity.
 ____ 26.
An object thrown at an angle of 20˚
will have a longer hang-time than an object thrown
at 60˚.
 A brick has a weight of 10 N, if this brick is at
rest in your hands what is the net force on it?
A projectile launched with a speed of 30 m/s at
an angle of 70° will…
 a. will initially be moving faster horizontally
than it is vertically
 b. will initially be moving faster vertically
than it is horizontally
 c. will initially be moving equally as fast
horizontally as it is vertically
70°
 d. all of the above
 If you swing a baseball bat, which part of the bat
has the fastest linear speed..
 A) the end of the bat
 B) the handle of the bat
 C) the middle of the bat
 D) all parts of the bat have the same linear speed
If you swing a baseball bat,
which part of the bat has
the fastest rotational
speed..
 A) the end of the bat
 B) the handle of the bat
 C) the middle of the bat
 D) all parts of the bat have the same linear speed
**Not on 2013 TEST**
If the dot on the below
picture represents the
Center of Gravity of the
block, will it topple or
stay upright?
When you punch a wall, which of
the following values are larger
compared to when you punch a
pillow?
 A) change in momentum
 B) Impulse
 C) Change in speed
 D) Force
 E) all of the above
A car goes from being at
rest to a speed of 30 m/s in
6 seconds, what is the cars
acceleration?
Which is more “elastic”, a
tennis ball or a billiard
ball?
A calorie is a unit for what
type of quantity?
 ____ Which path below would best represent
the path of a bomb that’s being dropped from
a moving airplane as an observer from
ground would see it (no air resistance)?
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 What is the net force on an object that is
moving at a constant velocity of 30 m/s?
 What unit is mass measured in?
What unit is weight measured
in?
 What would the result of an INELASTIC
collision look like?
 Can two different people observe the same
object to be going at two different speeds at
the same time?
 A projectile is shot straight upwards at 40
m/s, how long will it take the projectile to
return to the point it was fired from?
 Pushing a heavy object up a ramp instead of
directly lifting it will do which of the
following?
 A) Reduce the amount of work you have to do
 B) Reduce the amount of force you have to apply
 C) Reduce the distance a force has to be applied
over
 D) All of these
 If you are pulling a cart will a force of 20 N
and the cart rolls at a constant velocity….
 A) How much is the net force on the cart?
 B) how much is force of friction on the cart?
 Simple machines do which of the following?
 A) multiply work
 B) multiply force
 C) multiply energy
 D) multiply momentum
 E) all of the above
 What makes a boat in seas like this more
likely to roll to one side?
 Are satellites projectiles?
 What is the name for the sum or combination
of vectors?
 Newton’s 3rd law states that every force has
an equal and opposite reaction force, if we
call the force of the Earth’s gravity pulling you
downward the ‘action’ force… what is the
‘reaction’ force to this?
 While hitting a homerun, a baseball is hit by a
bat… which object experiences the greater
force during the collision?
Triceps
Day!!
In which of these situations is work being done?
 A) You are holding a boulder
 B) You are lifting a boulder from the ground
to above your head
 C) A ball is rolling at a constant velocity
across a frictionless surface
 A 5 kg backpack is carried to the top of a 20 m
high hill, how much work was done on the
backpack?
 Two cars drive toward each other on the highway,
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according to a stationary observer car 1 is moving
at 60 mph East and car 2 is moving at 70 mph West.
What is the velocity of Car 1 relative to Car 2?
a. 130 mph West
b. 10 mph West
c. 0 mph
d. 130 mph East
 A baseball is thrown straight up into the air,
halfway through its trajectory, at the top of
its path the net force on the baseball is equal
to….
 A) 0 N
 B) its weight
 C) its mass
 D) cannot be known
 Name three different ways in which you could
be “accelerating”?
True or False
 As a projectile flies through the air the
horizontal component of its velocity is
changing.
 While using a lever, the short end moves a
distance of 7 cm and the long is pushed a
distance of 42 cm. What is the mechanical
advantage of the lever?
 a. 1/6
 b. 10
 c. 6
 d. 7
 When an objects speed triples by what factor
will its kinetic energy change?