Motion and Forces Test Review
Name: _______________
Name the SI units for the following measures:
kilogram
1. Mass: _________
meter
2. Distance: __________
m/s2
5. Acceleration: ____________
second
3. Time: __________
kg x m/s
6. Momentum: ___________
m/s
4. Velocity: _________
kg x m/s2
7. Force: ____________
Calculate the Net force and draw the resulting force vector and with the correct net force.
Resulting Vectors
100 N
50 N
8.
50 N
______________________
Balance/Unbalanced
Unbalanced
________________________
135 N
75 N
9.
50 N
110 N
______________________
Unbalanced
________________________
50 N
10.
75 N
25 N
______________________
90 N
Unbalanced
________________________
90 N
11.
0N
______________________
Balanced
________________________
force
12. A _________________ is often described as a push or pull.
weight
Mass
13. ________________ is a measure of the amount of matter in an object while _______________ is a measure
of the force of gravity acting on an object.
1st Law
14. Which of Newton's Laws is sometimes called the Law of Inertia. ____________________.
inertia
15. The tendency of an object to resist a change in motion is called _________________.
elephant
16. Which has more inertia, a full grown elephant or a dog? _________________
vector
17. Velocity, acceleration, force and momentum are ___________
quantities. They have magnitude and direction.
unbalanced
18. For an object to accelerate (velocity changes) it must be acted on by an __________________ force.
Balanced
19. __________________forces
produce no change in motion.
net
20. The combination of all the forces acting on an object is called the _______ force.
21. Which of Newton’s Laws describes the mathematical relationship between force, mass, and acceleration? 2nd
pairs
action
22. Newton’s Third Law states that forces exist in _______________, and for every __________ force there is an
reaction
equal and opposite _____________ force.
23. Which of Newton’s Laws does each example illustrate?
a. A elephant sitting is hard to move, but a charging elephant is hard to stop. 1st
b. A gun pushes the bullet forward while the bullet pushes the gun back into your shoulder. 3rd
c. If full grocery cart requires a greater net force to accelerate compared to an empty cart. 2nd
24. Identify the forces
a.
Gravity
Engine’s
Push
b.
Air Resistance
d.
Rolling Frictionc.
Normal Force e.
Static
25. _____________ friction exists between two objects in contact when neither are moving.
26. If a stationary object has a net force of 25 Newtons acting on it, the object will (remain at rest/accelerate).
27. If an object is pushed with a constant net force, reducing its mass would cause the object’s acceleration to
(increase/decrease).
gravity
28. The principal forces acting on a object that is given an initial forward velocity are __________________
Air resistance
and _____________________.
29. Which shows the path an object would follow if pushed off a table.
a.
b.
c.
Projectile
motion
What is the name given to this type of motion? _________________ ________________
30. A feather and a golf ball fall from 10 meters above the ground. Which hits the ground first?
Using the terms air resistance and terminal velocity explain why?
The golf ball, because it has a smaller surface area so there is less air resistance.
velocity
mass
31. Momentum is the product of an object’s _____________ and ________________, both of which affect
equally
momentum __________.
Problem Solving
31. Jim takes 45 seconds to walk 180 meters north to a store. What is Jim’s velocity in meters per second?
32. A car moving west slows down from a velocity of 50 m/s to 20 m/s in 15 seconds. What is its acceleration?
33. Over the last ten seconds of his walk Jim increased his velocity from 2 m/s north to 6 m/s north to cross the
street before the light changed. What was Jim's acceleration?
34. An object with a mass of 25 kg accelerates east at a rate of 7 m/s2. What net force is acting on the object?
35. A force of 3,200 kg x m/s2 (Newtons) acts on a truck giving it an acceleration of 2 m/s2. What is the mass of
the truck?
36. A force of 150 kg x m/s2 (Newtons) acts on a 0.5kg object. What rate of acceleration will result?
37. If a bulldozer traveling east at 5 m/s runs into a grocery cart rolling west at 5 m/s. Which has more
momentum?
Why?
What will happen?
38. If 5 year old Johnny is pushing a full grocery cart and big brother decides to help push. Will the cart
accelerate? Why or why not?
39. If Jim has a mass of 70 kg and is running at a rate of 6 m/s, what would his momentum be?
40. What Net Force would be required for Jim to accelerate at a rate of 1.5m/s2 from 6 m/s to 9 m/s? (Remember,
Jim has a mass of 70kg.)
How long would the net force need to be applied?