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Quiz Chapter 2: Force and Motion I

10 questions · Form 4 Physics Bab 2: Force and Motion I

Question 1 of 10Score: 0

According to Newton's Second Law of Motion, acceleration is:

Full Question List & Answer Key

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1. According to Newton's Second Law of Motion, acceleration is:

  1. Directly proportional to resultant force and inversely proportional to mass
  2. Inversely proportional to resultant force and directly proportional to mass
  3. Directly proportional to both resultant force and mass
  4. Independent of resultant force and mass
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Answer: A

From F = ma => a = Fm. Thus, a ∝ F and a ∝ 1m.

2. Which of the following actions increases the impulsive force in an activity?

  1. Bending knees upon landing after a high jump
  2. Using thick mattresses in pole vaulting
  3. Using a hard wooden bat instead of a soft rubber bat to hit a baseball
  4. Wearing seatbelts with stretchable fabric
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Answer: C

A hard wooden bat decreases contact duration t, resulting in a significantly higher impulsive force F.

3. A gun fires a bullet forward. According to the Principle of Conservation of Momentum, why does the gun recoil backward?

  1. To increase the total kinetic energy of the system
  2. Because impulse is negative during firing
  3. To ensure the total final momentum remains zero, matching initial momentum at rest
  4. Because mass of bullet is greater than mass of gun
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Answer: C

Initial momentum is 0. Backward recoil momentum (-m_gun × v_gun) balances forward bullet momentum (m_bullet × v_bullet) so total momentum stays 0.

4. What is the momentum of a 1200 kg car traveling at a constant velocity of 15 m s⁻¹?

  1. 80 kg m s⁻¹
  2. 1800 kg m s⁻¹
  3. 18000 kg m s⁻¹
  4. 27000 kg m s⁻¹
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Answer: C

Momentum p = mv = 1200 kg × 15 m s⁻¹ = 18,000 kg m s⁻¹.

5. What is the physical quantity defined as the rate of change of displacement?

  1. Speed
  2. Velocity
  3. Acceleration
  4. Momentum
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Answer: B

Velocity is defined as the rate of change of displacement (v = st in a specific direction).

6. Calculate the weight of an astronaut of mass 70 kg on the Moon, where gravitational field strength g = 1.6 m s⁻².

  1. 112 N
  2. 43.75 N
  3. 686 N
  4. 700 N
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Answer: A

W = mg = 70 kg × 1.6 m s⁻² = 112 N.

7. In an elastic collision between two objects, which of the following quantities are conserved?

  1. Total momentum only
  2. Total kinetic energy only
  3. Both total momentum and total kinetic energy
  4. Neither momentum nor kinetic energy
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Answer: C

In elastic collisions, both total momentum and total kinetic energy are conserved.

8. A soccer player kicks a 0.5 kg stationary ball, giving it a speed of 20 m s⁻¹. If the foot stays in contact with the ball for 0.05 s, calculate the average force exerted on the ball.

  1. 10 N
  2. 100 N
  3. 200 N
  4. 400 N
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Answer: C

F = mv - mut = 0.5 × 20 - 00.05 = 100.05 = 200 N.

9. A ticker timer operates at a frequency of 50 Hz. What is the time duration for a 5-tick strip of ticker tape?

  1. 0.02 s
  2. 0.05 s
  3. 0.10 s
  4. 0.25 s
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Answer: C

1 tick = 150 s = 0.02 s. Therefore, 5 ticks = 5 × 0.02 s = 0.10 s.

10. The inertia of an object depends EXCLUSIVELY on its:

  1. Velocity
  2. Volume
  3. Weight
  4. Mass
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Answer: D

Mass is the sole measure of inertia. Larger mass means greater inertia.

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