Force and Laws of Motion Quiz - CBSE Class 11 Science
Free practice quiz: Force and Laws of Motion (CBSE Class 11 Science). 19 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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A body at rest will remain at rest unless acted upon by an external force. This statement describes:
- Newton's Second Law of Motion
- Newton's Third Law of Motion
- Newton's First Law of Motion
- Law of Conservation of Energy
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Answer: C. Newton's First Law of Motion
This is a direct statement of Newton's First Law of Motion, also known as the law of inertia.
A 10 kg mass experiences a force of 20 N. What is its acceleration?
- 0.5 m/s²
- 2 m/s²
- 200 m/s²
- 5 m/s²
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Answer: B. 2 m/s²
Using Newton's Second Law (F=ma), acceleration (a) = F/m = 20 N / 10 kg = 2 m/s²
Calculate the momentum of a 5 kg object moving at 10 m/s.
- 50 kg m/s
- 2 kg m/s
- 0.5 kg m/s
- 500 kg m/s
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Answer: A. 50 kg m/s
Momentum (p) = mass (m) x velocity (v) = 5 kg x 10 m/s = 50 kg m/s
A projectile is launched at an angle. Ignoring air resistance, what is the horizontal component of its acceleration?
- 9.8 m/s² downwards
- 0 m/s²
- 9.8 m/s² upwards
- It depends on the launch angle
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Answer: B. 0 m/s²
Gravity acts vertically. There is no horizontal acceleration if air resistance is ignored.
Explain the concept of impulse and its relationship to momentum.
- Impulse is the change in momentum
- Impulse is the rate of change of momentum
- Impulse is the product of force and time
- Impulse is equal to kinetic energy
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Answer: A. Impulse is the change in momentum
Impulse is defined as the change in momentum of an object. It is also equal to the product of force and the time interval over which the force acts.