Mid Term Exam Review
Mid-Term 2013-2014
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Conversions and Vectors
1.
2.
3.
4.
Convert 25km/h to m/s
Convert 1,239 meters to centimeters
Add two vectors A and B. Vector A = 5m @ 20 degrees, Vector B = 7m @ 80 degrees
Add three vectors A, B and C. Vector A = 2m @ 0 degrees, Vector B = 3.5m @ 45 degrees and
Vector C = 7m @ 90 degrees.
Average Velocity Average Acceleration
1. Heather and Matthew drive away from a red light at a constant 2m/s2. What is the velocity of
the car 15s after their starting point?
2. A car can travel at a maximum velocity of 34m/s. If a car travels at a constant acceleration from
rest for 23 seconds, what is the acceleration of the car if it achieves maximum velocity at
23seconds?
3. An Olympic sprinter can travel speeds up to 10m/s. In the 100m dash a particular woman ran
the first half of the race in 4.3seconds, what was her acceleration during this time?
4. If a plane lands on a runway with a velocity of 186km/h and can decelerate at -1.5m/s2, how far
will the plane move on the runway as it comes to a stop?
5. Draw graphs of d vs. t, v vs. t and a vs. t for an object moving with constant positive velocity
6. Draw graphs of d vs. t, v vs. t and a vs. t for an object moving with constant positive
acceleration.
Kinematics and Free Fall
1. The kinematic equations can be used when what value is held constant?
2. A graph of displacement vs. time for a particle that undergoes constant acceleration would look
like a __________________.
3. A ball is dropped from a tall building. It takes the ball 4.5s to hit the ground. How tall is the
building?
4. A heavy ball accelerates from rest down an incline. In the first second the object travels a
displacement of 3.3m. How far does the ball travel between the intervals 3s-4s?
5. An object thrown straight into the air. While it is rising:
a. Its velocity and acceleration are both positive.
b. Its velocity is positive and its acceleration is negative
c. Its velocity and acceleration are both negative
d. Its velocity is negative and its acceleration is positive
6. A baseball is hit straight up and caught by a catcher 2 seconds later. Calculate the maximum
height of the ball.
7. A stone is thrown downward at a velocity of 10m/s. What is the velocity of the stone after 20s?
8. A mass is given a velocity of Xm/s straight into the air. How much higher does an object travel if
it is shot up at a velocity of 2*Xm/s?
Mid Term Exam Review
Methacton High School Physics Department
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9. A car slams on the brakes to avoid a collision. The car decelerates at 5m/s2 for a distance of
40m where it stops. What was the velocity of the car just before the brakes were applied?
10. If a car is traveling to the right at a constant velocity and then the brakes are applied, what is the
direction of the acceleration?
11. What is true about an object that has reached maximum height?
12. If a plane has an initial velocity of 150m/s and accelerates to a velocity of 200m/s in 2 seconds,
what is its acceleration?
13. A ball is thrown upwards on the moon where gravity is 1/6 the amount here on Earth. If the
initial velocity is 30m/s, what is the maximum height reached by the ball?
14. A boat wants to cross a 125m wide stream. If the boat can travel at 5m/s and heads directly
across, how long will it take for the boat to cross if the stream is moving at 2m/s perpendicular
to its motion? How fast relative to an outside observer is the boat moving?
Projectile Motion
For questions 1-3 state whether it applies to a case 1, case 2, or case 3 projectile – More than one
answer MAY apply.
1.
2.
3.
4.
The initial velocity in the x direction remains constant throughout flight
Time of fall = Time of flight
Time to max height is ½ the total time
Explain what happens to the y-component of velocity throughout the entire flight of a case II
projectile.
5. Define Range.
6. An object is launched horizontally from the top of a 40m building with an initial velocity of
20m/s, what is the range of the projectile?
7. A bullet is launched from the ground such that it will have maximum range. If the initial velocity
of the bullet is 300m/s, how long is the bullet in the air? Neglect air resistance.
Newton’s Laws
1.
2.
3.
4.
5.
6.
7.
8.
Define Inertia.
State all three of Newton’s laws of motion.
A force of 12 N acts on a 2kg mass, calculate the acceleration of the mass
What is the net force on a 20kg bowling ball moving at a constant 20m/s, initially given 13N of
force
A 4kg mass is resting on a 30degree incline. Draw the free-body diagram (Frictionless)
Using the information in problem 5 calculate the acceleration of the mass down the incline
Calculate the acceleration of an Atwood’s machine that has mass m2 = 10g and m1 = 5g
Three forces act on a mass of 5kg. The mass is initially at the origin. Calculate the net force on
the object, the acceleration and the direction it will move.
i. F1 = 5N @ 0 degrees, F2 = 10N @ 45 degrees, F3 = 8N @ 200 degrees
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Methacton High School Physics Department
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9. Two ropes hold a sign. If the sign has a weight of 1200N and the angle between the ropes is 80
degrees, find the tension in each rope.
10. A mass slides to rest after 3m. If the initial velocity of the mass was 10m/s, what is the
coefficient of friction?
11. A force of 12N is pushing a mass of 1kg upwards from Earth. What is the acceleration of the
mass?
12. A mass slides down an incline with a constant velocity. If the incline is at an angle of 25 degrees
what is the coefficient of friction?
13. Joe pulls a box with a rope using a force of 25N at an angle of 30 degrees. What is the
acceleration of the box if the box has a mass of 2kg and the coefficient of friction is .22?
14. An object is pulled up an incline using a rope. The angle of the incline is 20 degrees and the box
accelerates at 2m/s2. If the mass of the object is 2kg, what force must be applied to move the
object at that acceleration if the coefficient of friction is .14?
15. An incline vertical system has a hanging mass of 2kg and an incline mass of 1kg. What is the
acceleration of the mass if the angle is 10 degrees?
16. A horizontal force of 400N is required to pull a 1760N trunk across the floor at a constant
velocity. What is the coefficient of friction?
17. A 3kg box slides from rest down a 35 degree incline. How long does it take the box to reach the
bottom of the 4.75m incline if the coefficient of friction is .2?
18. A freight train has a mass of 1.5x107kg. If the locomotive can exert a constant pull of 7.5x105N,
how long would it take to increase the velocity of the train from rest to 85km/h?
19. A 5kg bucket of water is raised from a well by a rope. If the upward acceleration of the bucket is
3m/s2, find the force exerted by the rope on the bucket of water.
20. Two forces are pulling on a 1kg mass, 8N to the left and 15N to the right. What is the
acceleration of the mass?
Torque
1. A force of 25N acts at an angle of 30 degrees to a door. If the force acts .7m from the hinges,
what torque is produced by the force?
2. A 3m long seesaw is supported at its center. A 240N child sits .7m to the left of the support,
where should a 190N child sit in order to maintain equilibrium?
Mid Term Exam Review
Methacton High School Physics Department
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