Motion and Forces

how can you find the speed of something?

Distance (m) /time (s) = speed (m/s)

how can you find the weight of something?

Weight (N) = Gravity (N/kg) X Mass (kg)

how do you find the pressure of something?

Pressure (Pa) = Force (N) /Area (m X m)

how do you find the density of something

Mass (kg) / volume (mXmXm) = Density (kg/m)

Balanced force

Has the resultant force of 0N. It goes opposite ways on an object cancelling each other out. It doesn’t move

unbalanced force

Forces that goes in the same direction or the opposite direction but one of the forces are stronger, moving the object

Resultant force

The final result from another force. Forces in the same direction add. In opposition they subtract.

Contact force

A force that acts between 2 objects that are touching. Friction, push+pull, air and water resistance

Non-contact force

a force that isn’t touching an object but still acts on it. Gravity, Electrostatic, magnetism

Forces

a force is either a push or a pull. It can change the shape speed and direction of an object.

Examples of forces

Gravity, Upthrust, friction , more

Relative speed

Is the relation of one moving objects against another

Relative speed equations

Objects moving in the same direction= fastest speed - smallest speed

Objects moving in opposite= add the speeds together.

When does gravity decrease?

The more further away you are from the centre of the earth.

Weight is measured in.. Mass is measured in…

Weight, N. Mass, kg