# Physics GCSE forces in motion (quick)

Easy and condensed

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

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