# Force and motion

Teacher recommended

- Created by: lottiewhitehead123
- Created on: 13-01-18 13:46

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- forces and motion
- scalars and vectors
- scalar quantities have a size or magnitude (eg. mass and speed)
- vector quantities have a size or magnitude but a specific direction (eg. velocity and acceleration)

- scalar quantities have a size or magnitude (eg. mass and speed)
- speed (m/s) = change in distance (m)/ time taken (s)
- acceleration is a change in velocity
- acceleration (m/s2) = change in velocity (m/s) / time taken (s)
- a= (v-u) / t
- v= final velocity u= initial velocity

- a= (v-u) / t

- acceleration (m/s2) = change in velocity (m/s) / time taken (s)
- velocity is speed in a certain direction
- v2- u2= 2 x a x X

- newtons first law
- a body will remain at rest or continue in a straight line if the forces and speed are balanced.
- newtons second law
- when a resultant force acts on a mass then there will be a change in velocity.
- resultant force= an object with different forces acting on it which are +

- when a resultant force acts on a mass then there will be a change in velocity.

- weight is the force that a body experiences.
- weight (N) = mass (kg) x gravitational field strength (N/kg)

- mass is the measure of the amount of matter
- Kg

- momentum (kg m/s ) is the energy that keeps a object moving in the same direction
- it is difficult to change the direction of movement of an object with a lot of momentum
- p= m x v

- it is difficult to change the direction of movement of an object with a lot of momentum
- force is the rate of change of momentum
- force (N) = change in momentum (kg m/s) / time taken for change (m/s)

- newtons third law
- for every action there is a equal and opposite reaction

- stopping distance
- thinking distance= the time taken for a driver to react to a situation
- increases when driver is : tired, distracted, alcohol or drugs

- braking distance= the distance taken to stop once the brakes are applied
- increases if : the roads are icy/wet, worn brakes

- thinking distance= the time taken for a driver to react to a situation

- scalars and vectors

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