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Questions and Answers
Charge in momentum of a body is:
Define the term impulse and give its S.I. unit.
The impulse is defined as the product of force and time, which is the change in momentum of the body. Its S.I. unit is Newton × sec.
What is the change in momentum of a body thrown vertically up with velocity v and returning back with the same velocity?
0
State Newton's three laws of motion.
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Derive the law of conservation of linear momentum starting from the third law of motion.
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A ball of mass 'm' strikes a rigid wall with the speed 'u' and rebounds back with the same speed. The impulse imparted to the ball by the wall is:
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Define the coefficient of friction.
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Define the coefficient of kinetic friction.
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What are the various forces acting on a block of mass 'm' held on a rough inclined surface of inclination θ?
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Study Notes
Laws of Motion
- Change in momentum of a body is defined as the product of force and time.
- Impulse is the product of force and time, which is change in momentum of the body.
- S.I. unit of impulse is Newton × sec.
- Change in momentum of a body thrown vertically upwards with velocity v is 0.
- Change in magnitude of momentum of a body thrown vertically upwards with velocity v is 0.
- Newton's Three Laws of Motion:
- First law (Law of inertia): An object at rest will stay at rest, and an object in motion will stay in motion with the same speed and in the same direction, unless acted upon by an unbalanced force. -Second law (Law of acceleration): The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. -Third law (Law of action-reaction): For every action, there is an equal and opposite reaction.
- The law of conservation of linear momentum can be derived from Newton's third law of motion.
- Impulse imparted to a ball of mass m striking a rigid wall with speed u and rebounding with the same speed is – 2mu.
- The coefficient of friction (μ) between two surfaces is the ratio of the limiting frictional force to the normal force between them.
- The coefficient of kinetic friction (μs) between two surfaces is the ratio of the force of kinetic friction to the normal force between them.
- A body does not always move in the direction of external force acting on it. This is because the body might already be in motion in a different direction or have another force acting on it.
- The physical quantity that is a measure of inertia of a body is mass.
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Description
Test your understanding of the Laws of Motion with this quiz. Explore concepts such as momentum, impulse, and Newton's three laws that govern motion and forces. Perfect for students studying physics at a foundational level.
