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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

Why does a passenger jerk forward when a fast-moving bus suddenly applies the brakes?

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. Why does a passenger jerk forward when a fast-moving bus suddenly applies the brakes?

  1. Due to the backward force of gravity
  2. Due to inertia resisting the change in forward motion
  3. Due to impulse generated by the brake pads
  4. Due to the conservation of kinetic energy
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Answer: B

By Newton's First Law, the passenger's body tends to maintain its state of forward motion due to inertia.

2. A stone is thrown vertically upwards with an initial velocity of 15 m s⁻¹. Assuming g = 9.81 m s⁻² and neglecting air resistance, what is its velocity at the maximum height?

  1. 15.0 m s⁻¹
  2. 9.81 m s⁻¹
  3. 0 m s⁻¹
  4. -15.0 m s⁻¹
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Answer: C

At maximum height, an object momentarily comes to a complete stop, so its velocity v = 0 m s⁻¹.

3. 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.

4. Impulse is defined as the change in momentum. Its SI unit is equivalent to:

  1. N m
  2. N s
  3. N s⁻¹
  4. kg m s⁻²
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Answer: B

Impulse J = F × t (Newton-seconds, N s), which is equivalent to kg m s⁻¹.

5. 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.

6. 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.

7. 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.

8. An object in free fall near Earth's surface accelerates at approximately 9.81 m s⁻². This means that during every second of fall:

  1. Its displacement increases by 9.81 m
  2. Its velocity increases by 9.81 m s⁻¹
  3. Its mass decreases by 9.81 kg
  4. Its weight increases by 9.81 N
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Answer: B

Acceleration of 9.81 m s⁻² means velocity increases by 9.81 m s⁻¹ every second.

9. 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.

10. 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).

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