A person is moving a heavy box across the floor. If the force applied to the box increases, what happens to the net force on the box?

Depends on the surface friction

Army Medical College (AMC) Entry Test Physics Force & Motion Set 2

Army Medical College (AMC) Entry Test Physics Force & Motion — Set 2

Question 1
Q1. A 16-year-old athlete feels muscle fatigue during a sprint. Which process is responsible for the rapid ATP production in this situation?
- A) Anaerobic Respiration
- B) Aerobic Respiration
- C) Muscle Glycolysis
- D) Lactic Acid Fermentation
Answer: Lactic Acid Fermentation
Explanation: Lactic acid fermentation is responsible for rapid ATP production; anaerobic respiration does not provide enough ATP, aerobic respiration is too slow.
Question 2
Q2. A person is moving a heavy box across the floor. If the force applied to the box increases, what happens to the net force on the box?
- A) Decreases
- B) Increases
- C) Remains constant
- D) Depends on the surface friction
Answer: Increases
Explanation: As force increases, net force on the box also increases according to Newton's first law of motion.
Question 3
Q3. A car accelerates from rest to 10 m/s in 2 seconds. What is the average acceleration of the car?
- A) 5 m/s^2
- B) 10 m/s^2
- C) 20 m/s^2
- D) 25 m/s^2
Answer: 10 m/s^2
Explanation: Average acceleration is calculated as change in velocity divided by time taken, which equals 10 m/s / 2 s.
Question 4
Q4. A 60 kg person is standing on a scale. If the normal force exerted on them is 600 N, what is their acceleration?
- A) 0 m/s^2
- B) 0.1 m/s^2
- C) 0.5 m/s^2
- D) 1 m/s^2
Answer: 0 m/s^2
Explanation: Since the normal force equals the person's weight, their acceleration is zero, assuming no other forces are acting.
Question 5
Q5. A force of 50 N acts on an object of mass 10 kg. What is the acceleration of the object?
- A) 0.1 m/s^2
- B) 0.5 m/s^2
- C) 2 m/s^2
- D) 5 m/s^2
Answer: 0.5 m/s^2
Explanation: Acceleration is calculated as force divided by mass, which equals 50 N / 10 kg.
Question 6
Q6. A spring has a spring constant of 100 N/m. What is the force required to displace it by 0.5 m?
- A) 20 N
- B) 50 N
- C) 100 N
- D) 500 N
Answer: 100 N
Explanation: Force is calculated as spring constant multiplied by displacement, which equals 100 N/m * 0.5 m.
Question 7
Q7. A car is traveling at 20 m/s. If it decelerates uniformly to 10 m/s in 2 seconds, what is its deceleration?
- A) 5 m/s^2
- B) 10 m/s^2
- C) 20 m/s^2
- D) 25 m/s^2
Answer: 10 m/s^2
Explanation: Deceleration is calculated as negative change in velocity divided by time taken, which equals -10 m/s / 2 s.
Question 8
Q8. A person is standing on a scale in an elevator. If the elevator accelerates upward at 5 m/s^2, what is the normal force exerted on the person?
- A) 600 N
- B) 650 N
- C) 700 N
- D) 750 N
Answer: 700 N
Explanation: Normal force equals the person's weight plus the force due to acceleration, which equals 600 N + 5 kg * 5 m/s^2.
Question 9
Q9. A ball is thrown upward with an initial velocity of 20 m/s. What is its velocity after 2 seconds?
- A) 10 m/s
- B) 15 m/s
- C) 20 m/s
- D) 25 m/s
Answer: 10 m/s
Explanation: Velocity decreases due to acceleration due to gravity, which equals 20 m/s - 9.8 m/s^2 * 2 s.
Question 10
Q10. A force of 100 N acts on an object of mass 20 kg. What is the acceleration of the object?
- A) 0.1 m/s^2
- B) 0.5 m/s^2
- C) 2 m/s^2
- D) 5 m/s^2
Answer: 2 m/s^2
Explanation: Acceleration is calculated as force divided by mass, which equals 100 N / 20 kg.
Question 11
Q11. A spring has a spring constant of 50 N/m. What is the force required to displace it by 1 m?
- A) 10 N
- B) 20 N
- C) 50 N
- D) 100 N
Answer: 50 N
Explanation: Force is calculated as spring constant multiplied by displacement, which equals 50 N/m * 1 m.
Question 12
Q12. A car is traveling at 30 m/s. If it accelerates uniformly to 40 m/s in 3 seconds, what is its acceleration?
- A) 2 m/s^2
- B) 4 m/s^2
- C) 6 m/s^2
- D) 8 m/s^2
Answer: 6 m/s^2
Explanation: Acceleration is calculated as change in velocity divided by time taken, which equals (40 m/s - 30 m/s) / 3 s.
Question 13
Q13. A force of 200 N acts on an object of mass 30 kg. What is the acceleration of the object?
- A) 0.1 m/s^2
- B) 0.5 m/s^2
- C) 2 m/s^2
- D) 5 m/s^2
Answer: 2 m/s^2
Explanation: Acceleration is calculated as force divided by mass, which equals 200 N / 30 kg.
Question 14
Q14. A spring has a spring constant of 200 N/m. What is the force required to displace it by 0.5 m?
- A) 10 N
- B) 20 N
- C) 100 N
- D) 200 N
Answer: 100 N
Explanation: Force is calculated as spring constant multiplied by displacement, which equals 200 N/m * 0.5 m.
Question 15
Q15. A person is standing on a scale in an elevator. If the elevator accelerates downward at 5 m/s^2, what is the normal force exerted on the person?
- A) 600 N
- B) 550 N
- C) 500 N
- D) 450 N
Answer: 500 N
Explanation: Normal force equals the person's weight minus the force due to acceleration, which equals 600 N - 5 kg * 5 m/s^2.
Question 16
Q16. A ball is thrown upward with an initial velocity of 30 m/s. What is its velocity after 2 seconds?
- A) 10 m/s
- B) 15 m/s
- C) 20 m/s
- D) 25 m/s
Answer: 20 m/s
Explanation: Velocity decreases due to acceleration due to gravity, which equals 30 m/s - 9.8 m/s^2 * 2 s.
Question 17
Q17. A force of 150 N acts on an object of mass 25 kg. What is the acceleration of the object?
- A) 0.1 m/s^2
- B) 0.5 m/s^2
- C) 2 m/s^2
- D) 5 m/s^2
Answer: 2 m/s^2
Explanation: Acceleration is calculated as force divided by mass, which equals 150 N / 25 kg.
Question 18
Q18. A spring has a spring constant of 150 N/m. What is the force required to displace it by 1 m?
- A) 10 N
- B) 20 N
- C) 50 N
- D) 100 N
Answer: 50 N
Explanation: Force is calculated as spring constant multiplied by displacement, which equals 150 N/m * 1 m.
Question 19
Q19. A 50 kg person walks on a rough surface. What is the coefficient of friction between their shoes and the surface?
- A) 0.1
- B) 0.5
- C) 0.7
- D) 0.9
Answer: 0.1
Explanation: The coefficient of friction is typically around 0.1 on a rough surface, as it is a measure of how much force is required to move an object, and 0.1 is a common value for such surfaces.
Question 20
Q20. A car accelerates from rest to 30 m/s in 10 seconds. What is its acceleration?
- A) 3 m/s^2
- B) 5 m/s^2
- C) 10 m/s^2
- D) 15 m/s^2
Answer: 10 m/s^2
Explanation: The acceleration is calculated using the formula a = Δv / Δt, where Δv is the change in velocity and Δt is the time over which it occurs, giving an acceleration of 10 m/s^2.