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Force Review Questions
Name__________________Period ___ Date ________
(Alternate Title: Get a Grip)
1. What are two examples of contact forces and two examples of field forces?
2. A rope holds a 50 kg sign in the air above your head. What force keeps the
sign from crashing on your head?
3. What is the best definition of a normal force?
4. What are two examples of elastic forces?
5. Which of the following experiences the largest force due to gravity?
a. A 65 kg table
b. A 20 kg dog
c. A 3 kg rock
d. They all experience the same amount force due to gravity
Explain your answer
6. What is the Earth’s gravitational constant?
7. How is this different from the Force of gravity?
8. A dog has a mass of 15 kg. Knowing that the
strength of the gravitational field (g) is 9.8 N/kg,
what is the force of gravity (weight) of the dog?
FWAU
9. Create a force diagram for the dog?
10. Mr. Smith has a weight of 450 N. What is Mr. Smith’s mass in kg?
FWAU
11. This 95 kg astronaut has been transported to the moon. If the
gravitational field strength on the moon is 1.6 N/kg, what is the
weight of the man on the moon?
(Get it, man on the moon?) FWAU
12. If the man on the moon now picked up a rock, and its weight was 100 N, what is the mass
of the rock? FWAU
13. If this rock that was found on the moon was returned to Earth, what is the weight of the
rock now that it is back on Earth? FWAU
14. What is net force on the basketball?
a. 3 N to the left
b. 3 N to the right
4N
7N
c. 7 N to the right
d. 7 N to the left
e. 11 N
15. What is the net force on the plant?
8N
a. 0 N
b. 8 N up
c. 8 N down
d. 16 N
8N
16. A swing is suspended by two ropes. Amy and Ryan sit together on
the swing. The force of gravity on the swing is 50 N. The force of
gravity on Amy is 420 N and on Ryan is 470 N. What is the tension
force in each rope to support the kids and the swing? Identify the
total downward weight force and the tension on each rope.
Newton’s Laws
17. What is Newton’s 1st law?
18. What is Newton’s 2nd Law?
19. What is Newton’s 3rd Law?
20. You are helping your friend move a desk to a different location in her room. You push the
desk along the floor to its new location. Does it take more force
to____________________________?
a. Get the desk started
b. Keep the desk moving at constant speed
c. Getting the desk started and moving it at a constant speed take the same amount
of force
21. Explain #20 using Newton’s 1st Law.
22. Whenever the net force on an object is zero, could the object be moving? Explain your
answer using an example from our class and Newton’s 1st Law of Motion.
23. Jack is shopping with his little brother and pushing him in the empty shopping car while
applying a constant force. What happens to the acceleration of the cart as the cart is
loaded with items? Explain this using Newton’s 2nd Law.
24. Now that Jack is ready to check out, his little brother keeps throwing
things out of the cart. Jack is still applying a constant force, but what now
happens to the velocity of the cart? Explain this using Newton’s 2nd Law.
25. A motorcycle has a mass of 300 kg and accelerates at 8 m/s2. What
is the magnitude of the net force exerted on the motorcycle? FWAU
26. A tow truck exerts a force of 5000 N on a vehicle, accelerating it at 1.5 m/s2.
What is the mass of the vehicle? FWAU
27. If the tow truck exerts a force of 5000N on the car,
what is the force of the car on the Truck? Explain
using Newton’s 3rd Law.
28. A bowler pushes a 15 kg bowling ball with a horizontal force of 60 N. What is the
acceleration of the bowling ball at the moment it is released? FWAU
29. What are the forces acting on the bowling ball once it is released and is traveling down
the lane? Does the ball accelerate or travel with a constant velocity? Explain your answer
Using Newton’s 1st Law.
30. A 20 kg block and a 10 kg block lie on a level frictionless table. How much force would you
have to apply to each block so that they have equal acceleration of 4 m/sec2?
31. Finish this sentence about #30… When we doubled the mass, to have equal acceleration of
the blocks, we had to ___________________________________________________.
32. A 3 kg block is dragged in a straight line with a force of 10 N. If there is 4 N of friction
between the block and the surface, what is the acceleration of the block?
a. 2 m/s2
b. 3 m/s2
c. 4 m/s2
d. 5 m/s2
e. 10 m/s