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Law of Conservation of Momentum

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Questions and Answers

What is the law of conservation of momentum stating?

The total momentum of a closed system remains constant if no external force acts on it. (correct)

The force exerted on an object is always equal to the force exerted by the object.

The momentum of an object can change without any external force.

Bodies can apply forces on each other without external forces.

The momentum of a system can change without any external force acting on it.

False

What is the formula for momentum (P)?

P = M × V

The force (F) acting on an object is given by the formula F = _______________________, where m is the mass of the object and a is the acceleration.

<p>ma</p> Signup and view all the answers

Match the given physical quantities with their corresponding units.

<p>Momentum (P) = kg m/s Force (F) = N Mass (m) = kg Acceleration (a) = m/s²</p> Signup and view all the answers

Study Notes

Law of Conservation of Momentum

The law states that the total momentum of a closed system remains constant if no external force acts on the system.
Momentum is conserved when the net external force acting on a system is zero.

Momentum and External Force

When an external force is applied, the momentum of the system changes.
The law of conservation of momentum only applies when there is no external force acting on the system.

Example of Momentum Conservation

A ball of mass 2 kg is moving along a horizontal floor with a speed of 2.3 m/s.
The ball hits a hard surface and rebounds with a speed of 4.8 m/s in 0.2 seconds.
The force (F) acting on the ball can be calculated using the formula: F = Δp / Δt.
The momentum change (Δp) can be calculated using the formula: Δp = m × Δv.

Equations

F = Δp / Δt (force equation)
Δp = m × Δv (momentum change equation)
p = m × v (momentum equation)

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Description

This quiz is about the law of conservation of momentum, which states that the total momentum of a closed system remains constant if no external force acts on the system. It includes examples and problems to solve.