Newton’s Laws Test Review

1. Newton’s Laws Test Review

2. 1 A motorcycle traveling 35 mi/hr slows as it approaches a stop sign. This is an example of — • acceleration • distance • speed • velocity

3. 2 • A released balloon flies across the room. The balloon slows down as the forces become — • balanced • frictional • restricted • unbalanced

4. 3 A bike racer travels 17 mi/hr in a southerly direction. This is an example of — • distance • speed • velocity • acceleration

5. 4 • The net force of balanced force pairs is ____. a. positive. b. negative. c. either positive or negative. d. zero

6. Between which two locations would the greatest change in speed most likely occur? • Between S and T • Between T and U • Between U and X • Between T and X

7. 6 • What force is necessary to accelerate a 1,250 kg car at a rate of 40 m/s2? a. 31.25 N b. 40.0 N c. 1,250 N d. 50,000 N

8. Based on the observations, the runners do not accelerate during — • Segment A • Segments A and C • Segments B and C • Segments C and D

9. 8 • What is the net force acting on the object? • Are the forces balanced or unbalanced? 30 N left 50 N right 20 N right unbalanced

10. 9 How does Newton’s first law of motion apply to a ball rolling across the gym floor after an unbalanced force is applied? • The ball will stop at the line halfway across the gym. • The ball will continue to roll until an unbalanced force is applied. • The ball will start bouncing until it hits the wall. • The ball will roll in a zigzag pattern to the other end of the gym.

11. 10 The law requires all people riding in a car to wear seat belts. If the car suddenly stops, the seat belts hold the passengers in place. How does Newton’s first law of motion apply when a person is not wearing a seat belt? • A The passengers will continue moving forward due to inertia. • B The passengers will move backward into the seat. • C The passengers will lean into another passenger’s seat. • D The passengers will not be affected by the sudden stop of the car.

12. 11 When the air is released from a balloon, the air moves out one end and the balloon moves in the other direction. Which statement does this situation best illustrate? A What goes up must come down. B For every action there is an equal and opposite reaction. C The shape and size of an object affect air resistance. D The acceleration due to Earth’s gravity is 9.8 m/s2.

13. 12 Which of these statements best describes the action-reaction force needed to launch a space shuttle? • The ground pushes up on the rocket when exhaust gases push down on the ground. • Exhaust gases push down on air, while the ground pushes up on the rocket. • The rocket pushes exhaust gases down, while the exhaust gases push the rocket up. • Gravity pulls the rocket exhaust down, while friction pushes up against the atmosphere.

14. If a force of 50 N is applied to each of the three objects, which one will have the least acceleration? • Object X, because it has the greatest mass • Object Y, because it has the least volume • Object Z, because it has the least mass • Object Z, because it has the greatest volume

15. How much force is needed to accelerate a 3 kg toy car at a rate of 1.5 m/s2? F = M x A F = 3kg x 1.5m/s2 F= 4.5 N