p2.1 forces and motion
- Created by: EllieChxpmxn
- Created on: 05-03-17 14:02
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- P1.1 forces and motion
- introduction to forces
- either push or pull and measured in newtons (N)
- can accelerate/decelerate, balance, squash or stretch an object
- when 2 objects interact the force on one object ( the action force ) is matched by an equal and opposite force ( a reactant force )
- when several forces act on a point they may be replaced by a single force with the same effects as the originals. this is called a resultant force.
- if the resultant force is 0 the object will stay still or move at a constant speed
- newtons 1st law - object remain at rest/in motion unless acted on by external and unbalanced force
- forces that change shapes
- elastic deformation is when elastic objects can be pushed or pulled but will return to their original shape when released.
- energy is stored in elastic potential energy.
- springs are an elastic object. when a force is applied is changes length. the extra length is called an extension
- the extension is proportional to the force applied
- the spring constant. links force and extension. f = k x X force = the spring constant times the extension
- elastic deformation is when elastic objects can be pushed or pulled but will return to their original shape when released.
- distance speed and veloctiy
- speed = distance / time
- distance = speed x time
- velocity is a measure of an objects speed and direction
- speed = distance / time
- acceleration
- measure of how quickly something gets faster. a = v-u/t
- the harder the push the faster the acceleration. the heavier an object the less it accelerates.
- force = mass x acceleration
- resultant force on moving object - slowing down is deceleration.
- slowing down and stopping
- the better the brakes of a car the more friction so the faster the stop
- the faster a car the longer the time to stop
- thinking distance also effects the stopping distance
- the better the brakes of a car the more friction so the faster the stop
- terminal velocity
- w = m x g
- when the resultant force is 0 and there is no further acceleration
- introduction to forces
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