5 Questions
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.
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.
ma
Match the given physical quantities with their corresponding units.
Momentum (P) = kg m/s Force (F) = N Mass (m) = kg Acceleration (a) = m/s²
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)
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.
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