Unit 5: Laws of Motion — Online MCQ Test
PHYSICS · CLASS 11 INTERMEDIATE 1 YEAR · Telangana State Board
Practice Unit 5: Laws of Motion with a free chapter-wise online MCQ test.
This chapter covers: Focusing on dynamics this chapter details intuition of force Newton three laws of motion linear momentum conservation friction types and uniform circular motion dynamics..
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Unit 5: Laws of Motion — Important Questions & Answers
Which of the following is Newton's First Law of Motion?
- A. F = ma
- B. Every action has an equal and opposite reaction
- C. A body continues in its state of rest or uniform motion unless acted upon by an external unbalanced force
- D. Momentum is always conserved in any situation
Answer: C. A body continues in its state of rest or uniform motion unless acted upon by an external unbalanced force
Newton's First Law states that a body does not change its state of rest or uniform motion unless an external unbalanced force acts on it.
Newton's First Law states that a body does not change its state of rest or uniform motion unless an external unbalanced force acts on it.
The SI unit of force is:
- A. Joule
- B. Newton
- C. Watt
- D. Pascal
Answer: B. Newton
Force is measured in newton (N) in the SI system.
Force is measured in newton (N) in the SI system.
A 5 kg body is acted upon by a force of 20 N. Its acceleration is:
- A. 1 m/s²
- B. 2 m/s²
- C. 4 m/s²
- D. 10 m/s²
Answer: C. 4 m/s²
Using Newton's second law, a = F/m = 20/5 = 4 m/s².
Using Newton's second law, a = F/m = 20/5 = 4 m/s².
Which of the following correctly compares static friction and sliding friction?
- A. Static friction is always less than sliding friction
- B. Static friction can vary from zero up to a limiting value, while sliding friction is nearly constant
- C. Sliding friction exists only when the body is at rest
- D. Both are independent of the nature of surfaces
Answer: B. Static friction can vary from zero up to a limiting value, while sliding friction is nearly constant
Static friction adjusts its magnitude up to a limiting value, whereas sliding friction is approximately constant for a given pair of surfaces.
Static friction adjusts its magnitude up to a limiting value, whereas sliding friction is approximately constant for a given pair of surfaces.
A 1 kg body moving with velocity 4 m/s experiences a constant force of 2 N in the same direction for 3 s. Its final momentum is:
- A. 2 kg m/s
- B. 4 kg m/s
- C. 10 kg m/s
- D. 12 kg m/s
Answer: C. 10 kg m/s
Initial momentum = mv = 1 × 4 = 4 kg m/s. Impulse = Ft = 2 × 3 = 6 kg m/s, so final momentum = 4 + 6 = 10 kg m/s.
Initial momentum = mv = 1 × 4 = 4 kg m/s. Impulse = Ft = 2 × 3 = 6 kg m/s, so final momentum = 4 + 6 = 10 kg m/s.