GCSE Physics (AQA)

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Force & Change of Momentum

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Forces Momentum

Force & Change of Momentum

3:40 Force as Change of Momentum
Spec 4.5.7.3
Previous Momentum as a Vector Next Force-Momentum Equation
  • A resultant force on a stationary object causes it to gain momentum.
  • Resultant force occurs when forces on an object are unbalanced, expressed as a single force.
  • Example: A stationary billiard ball gains momentum when hit by a cue.
  • Momentum is the product of mass and velocity; gaining velocity means gaining momentum.
  • Total momentum in a system cannot change; Newton's third law states equal and opposite reaction forces.
  • Resultant force on a moving object changes its momentum.
  • Example 1: A skydiver loses momentum when a parachute opens, slowing them down.
  • Example 2: A satellite's direction changes due to gravity, altering its momentum.
  • Momentum is a vector with magnitude and direction; change in direction changes momentum.
  • Change in momentum increases with stronger force or longer application time.
  • Example: A car slows down by applying a braking force, losing momentum.
  • Stronger brakes or longer brake application increases momentum loss.
  • Understanding forces and momentum changes is crucial for analyzing examples.

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