# Physics GCSE forces in motion (quick)

Easy and condensed

- Created by: H0llytree
- Created on: 29-03-19 08:54

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- forces in motion
- vector quanity
- magnitude and direction

- scalar has no direction and vector has
- 2 scalar: speed, distance, temp

- contact force: when two objects have to touch, push or pull force
- non contact: don't need to be touching for force to act (magnetic or gravitational force)
- interaction pair
- Untitle pair of forces that are equal and opposite and act on two interacting objects. (Newton's Third Lawd

- gravitational force:
- force of attraction between masses
- gives everything a mass and attract to the ground

- can vary by location (eg stronger when mass closer)

- force of attraction between masses
- mass?
- amount of stuff in an object
- weight?
- force acting on an object by gravitational field strength
- work out weight: mass x gravitational field strength

- measures in newtons
- can measure with a newtonmeter
- relationship between mass and weight: directional proportional
- 1 joule in a newton meter

- force acting on an object by gravitational field strength
- measured in kg
- centre of mass: force acting on a single point on object and whole mass concentrated

- free body diagram
- describes forces acting on object in what direction and how much force
- arrows show relative magnitude and direction (how much force acting)

- resultant force?
- overall force acting on an object
- find it by taking away if opposite direction and if all same then add them

- why and when work done?
- moves an object, energy is transferred, even useful or wasted
- equation: force x distance

- vector quanity

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