CLASS 9 · LEARNING KNOWLEDGE
Momentum and Interaction – Fundamental Principles
How it works
Momentum is the product of a body’s mass and velocity (p = m·v). It is a vector quantity, which means that direction and magnitude are important. In a closed system, the total momentum remains constant (law of conservation of momentum). Forces act as a change in momentum (force = change in momentum per time). Interactions between bodies lead to equally large, oppositely directed changes in momentum (action = reaction). Momentum transfer is central in collisions and recoil movements.
Note
The momentum of a body is calculated as the product of mass and velocity. In a closed system, the total momentum is conserved during interactions.
The momentum of a body is calculated as the product of mass and velocity. In a closed system, the total momentum is conserved during interactions.
An example
A ball (0.5 kg) rolls at 4 m/s. How large is its momentum?
Momentum = mass × velocity = 0.5 kg × 4 m/s = 2 kg·m/s.
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50 Exercises
To the learning unit →Own explanation and own practice exercises by AmyMath. Subject reference framework: Physics. The topic assignment may vary by federal state.