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Momentum

From classical mechanics to quantum field theory, momentum is the Universe's preferred language to describe motion. Learn here about momentum, its conservation, and how it captures our intuitions.

Problem Solving

         

Two ice skaters of weights \(42\text{ kg}\) and \(84\text{ kg}\) push off against each other starting from a stationary position. If the \( 42 \text{ kg} \) skater acquires a velocity of \( 6 \text{ m/s} \) to the right, what speed does the \( 84 \text{ kg} \) skater acquire?

A \(10.0\text{ g}\) bullet is fired from a rifle of mass \( 4 \text{ kg} .\) If the speed of the fired bullet is \( 850 \text{ m/s}, \) what is the approximate recoil speed of the rifle?

Two objects of weights \( 2 \text{ kg} \) and \( 3 \text{ kg} \) slide together with equal velocities of \( 9.0 \text{ m/s},\) and then they break apart. If the final velocity of the \( 3 \text{ kg} \) object is \( 10.0 \text{ m/s}, \) what is the magnitude of the final velocity of the \( 2 \text{ kg} \) object?

A glider of mass \( 100 \text{ g} \) is moving along a horizontal straight air track at \( 4 \text{ m/s}. \) It then collides with a stationary glider of mass \( 100 \text{ g}. \) After the collision, the velocity of the first glider becomes \( 2 \text{ m/s} \) in the same direction as before. What is the velocity of the second glider?

An object \(m_1 (= 2 \text{ kg}) \) which moves with a velocity of \( 15 \text{ m/s} \) collides with a stationary object \(m_2 (= 8 \text{ kg}). \) After the collision, they stick to each other and move together. Find the magnitude of velocity of both objects after the collision.

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