Physics - Dynamics

Net Force

overall force on an object

stationary

is not moving

constant speed

moving at the same speed

accelerating

speed is increasing

decelerating

speed is decreasing

unit for speed

v

speed

distance over time

acceleration

speed over time

distance

speed x time

Force

a push or a pull

Newton’s second law

if there is a net force on an object it always accelerates

mass

the amount of stuff something contains

weight

The force on an object due to gravity

Equation for weight

mass x acceleration

gravity on earth

10ms-2

pressure

force exerted by an object depending on both the size of the force and the area over which the force is applied

formula for pressure

force over area

work

If you push an object and it moves

formula for work

force x distance moved

unit for work

joules

Energy

The ability to do work

unit for energy

joules

law of energy conservation

The total energy before and after the interaction is the same, only transferred or transformed

gravitational potential energy

When work is done lifting an object, the force needed is equal to the weight of the object

formula for gravitational potential energy

mass x gravity x height

formula for kinetic energy gained

½ m x v2

power

how quickly work is done or energy is changed

formula for power

work over time