Laws of Motion
Maharashtra Board · Class 11 · Physics
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Quick Quiz: Laws of Motion
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A ball of mass 0.5 kg is thrown vertically upward with an initial velocity of 20 m/s. What is the force acting on the ball at the highest point of its trajectory? (Take g = 10 m/s²)
A car of mass 1000 kg accelerates from rest to 20 m/s in 10 seconds. What is the net force acting on the car?
Two blocks of masses 5 kg and 3 kg are connected by a string passing over a pulley. What is the acceleration of the system? (Take g = 10 m/s²)
A ball of mass 0.2 kg moving at 10 m/s collides with a wall and rebounds with the same speed. What is the change in momentum?
Sample Questions
Which of the following are examples of Newton's third law of motion?
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Walking on the ground, Recoil of a gun when fired, A book resting on a table, Rocket propulsion in space
Newton's third law states that for every action, there is an equal and opposite reaction. Walking involves foot pushing ground (action) and ground pushing foot (reaction). Gun recoil, book-table forces, and rocket thrust are all action-reaction pairs.
The force required to maintain constant velocity is zero according to Newton's first law.
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True
Newton's first law states that a body continues in its state of rest or uniform motion unless acted upon by an external force. For constant velocity, acceleration is zero, so net force must be zero.
Which of the following quantities are conserved in an elastic collision?
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Total momentum, Total kinetic energy
In elastic collisions, both total momentum and total kinetic energy are conserved. However, individual momenta and kinetic energies of objects can change during the collision.
A force of 50 N acts on a body for 0.2 seconds. What is the impulse delivered to the body?
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10 N⋅s
Impulse = Force × time = F × t = 50 N × 0.2 s = 10 N⋅s. Impulse is also equal to change in momentum of the body.
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