Law of Conservation of Momentum

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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.

False (B)

P = M × V

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

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

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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.

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.

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.