EOC Physics 1 ā Questions and Answers
Question 1: A car accelerates from rest to 20 m/s in 5 seconds. What is its acceleration?
- 2 m/sĀ²
- 4 m/sĀ² (Correct answer)
- 10 m/sĀ²
- 100 m/sĀ²
Correct answer: 4 m/sĀ²
Acceleration = change in velocity / time = (20 - 0) / 5 = 4 m/sĀ².
Question 2: According to Newton's First Law, an object at rest will remain at rest unless:
- it loses mass
- a net external force acts on it (Correct answer)
- gravity decreases
- friction increases
Correct answer: a net external force acts on it
Newton's First Law (inertia) states that objects remain in their state of motion unless acted upon by a net external force.
Question 3: A 10 kg object is pushed with a net force of 30 N. What is its acceleration?
- 0.3 m/sĀ²
- 3 m/sĀ² (Correct answer)
- 20 m/sĀ²
- 300 m/sĀ²
Correct answer: 3 m/sĀ²
Newton's Second Law: F = ma, so a = F/m = 30/10 = 3 m/sĀ².
Question 4: Which of the following is a scalar quantity?
- Velocity
- Force
- Speed (Correct answer)
- Displacement
Correct answer: Speed
Speed is a scalar quantity because it has magnitude only, while velocity, force, and displacement are vectors with both magnitude and direction.
Question 5: A ball is thrown horizontally from a cliff. Which statement about its motion is correct?
- Horizontal and vertical motions are dependent on each other
- Horizontal velocity increases due to gravity
- Vertical acceleration is 9.8 m/sĀ² downward (Correct answer)
- The ball travels in a straight line
Correct answer: Vertical acceleration is 9.8 m/sĀ² downward
Gravity causes a constant vertical acceleration of 9.8 m/sĀ² downward, while horizontal velocity remains constant (projectile motion).
Question 6: When two objects collide and stick together, what type of collision has occurred?
- Elastic collision
- Perfectly inelastic collision (Correct answer)
- Explosive collision
- Nuclear collision
Correct answer: Perfectly inelastic collision
A perfectly inelastic collision occurs when two objects collide and stick together, moving as one unit afterward, with maximum kinetic energy loss.
Question 7: What is the momentum of a 5 kg object moving at 8 m/s?
- 1.6 kgĀ·m/s
- 13 kgĀ·m/s
- 40 kgĀ·m/s (Correct answer)
- 3 kgĀ·m/s
Correct answer: 40 kgĀ·m/s
Momentum p = mv = 5 kg Ć 8 m/s = 40 kgĀ·m/s.
EOC Physics 1
A car accelerates from rest to 20 m/s in 5 seconds.
What is its acceleration?