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momentum and energy
FM1 chapters 1 / 2 - momentum, impulse, work done and energy
Term | Definition |
---|---|
momentum equation | mass x velocity |
impulse equation | change in momentum OR force x time |
conservation of momentum | the total momentum before an impact with a set of objects is equal to the total momentum after between the same set of objects |
momentum as a vector (yr2) | each component is treated separately, but the same rules apply |
general work done equation | component of force in the direction of motion x direction moved in direction of force (often force x distance) |
work done against gravity / gravitational potential energy equation | mass x g x vertical distance travelled |
kinetic energy equation | 0.5 x mass x velocity^2 |
work done in terms of energy | work done = change of energy |
work-energy principle definition | if there is some external force applied on an object, the change in the total energy (the sum of the kinetic and gravitational potential energy) is equal to the work done on the particle |
work-energy principle “equation” | work done due to the movement force + initial kinetic energy + initial gravitational energy = end kinetic energy + end gravitational energy + work done due to friction |
power definition | the rate of work |
power equation | force x velocity OR energy / time |