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Force and Newton’s 1st & 2nd Law
1.
Which is not a force?
a. friction
b. momentum
c. gravity
d. weight
2. You push on a box and are unable to move it. What force opposes your push?
a. static friction
c. rolling friction
b. sliding fiction
d. air resistance
3. Air resistance depends on
a. the velocity of a moving object
b. the weight of a moving object
c. the mass of a moving object
d. the inertia of a moving object
4. Newton’s first law of motion is sometimes called
a. inertia
b. momentum
c. conservation
d. resistance
5. Which represents Newton’s second law?
a. v = d/t
b. F = m x v
c. a = f/m
d. F = 0
6. Three forces act on a wooden crate that is initially at rest
as shown below. Determine the net force acting on the
crate and describe the resulting motion of the crate.
7. Suppose two 4-Newton forces act on an object in the same direction. What is the net force on the
object?
8. What happens to an object when an unbalanced force acts on it?
9. You push harder and harder on a box until it begins sliding across the floor. Which was the stronger of
the forces acting on the box, static or sliding friction?
10. How do ball bearings reduce friction in machinery?
11. Explain why a falling object subjected to Earth’s gravity does not continue to accelerate forever.
12. When shooting an arrow at a target, why is it advisable to aim above the bull’s-eye rather than directly
act it?
13. The graph shows the relationship between the force
acting on an object and the acceleration of the object.
What is the acceleration of the object when a 3newton force acts on it? What is the objects mass?
14. During a fuel economy test of a sports car, the car achieved more miles per gallon of gasoline when its
convertible top was up. Explain how the convertible top being up or down is related to the car’s fuel
economy.
15. What are the two ways in which the acceleration of an object can be increased?
16. A 100 kg crate, sliding on a floor, is brought to a stop by 25 N force. What is the deceleration of the
crate?
17. Which of the following correctly lists friction types (excluding fluid friction) from weakest to
strongest?
a. sliding, static, magnetic
c. weak, strong, nuclear
b. static, rolling, sliding
d. rolling, sliding, static
e. static, sliding, rolling
Use the diagram to answer questions 18 and 19.
18. If A = 60 N, B = 20 N, C = 30 N, D = 30 N and E = 30 N,
which of the following statements is FALSE?
a. A net force of 50 N acts on the crate and the crate
moves to the right
b. the crate accelerates to the right
c. the net force in the vertical direction is zero
d. force C represents the weight of the crate
e. Forces C and E represent balanced forces acting in the
vertical direction
19. Which force represents the sliding friction force?
a. A
b. B
c. C
d. D
e. E
20. What is the acceleration of a 1500 kg truck with a net force of 7500 N?