# PHYSICS PART 1

• Created by: Connor
• Created on: 12-02-14 17:02
• PHYSICS PART 1
• acceleration, speed and velocity
• acceleration is speeding up, slowing down or changing direction
• velocity is the speed and direction of a moving object
• air resistance is the restrictive force acting on an object
• thrust is the forward force of an engine
• terminal velocity is the steady speed reached when the downwards force of gravity balances out the upwards force of air resistance
• open a parachute slows down and creates a surface area and accelerates upwards until the balance is equal
• deceleration is a negative acceleration
• resultant force is the single force that has the same effect as two or more forces acting on it
• in a velocity time graph you have to calculate the area below the line
• stopping distance
• thinking distance is effected by tired, influence of alcohol or drugs(suppresses the nervous system)
• thinking distance+braking distance=stopping distance
• braking distance is effected by weather, breaks, tyres
• Hookes law and elastic potential
• elastic potential is energy stored in an object due to the object being stretched or squashed
• when you let go of the elastic object the energy is transferred back to its original shape
• hookes law: the bigger the force you apply to an elastic object the bigger the extension (distance the object travels)
• graph of Hookes law
• up to the straight line the force and extension are directionnaly proportional
• when the line starts to curve it's called the limit of proportionality
• the elastic object is now deformed and cannot be changed back to it's original shape
• weight
• a force acting on an object due to the gravity of a planet
• mass
• how much matter an object is made up of
• energy
• work is energy transferred over a distance
• power is the amount of energy transferred per second
• gravitational potential energy is energy stored in a object due to the object being lifted up
• on earth the gravitational field strength is 10N per kilogram
• things that affect GPE: change in height, mass, gravitational field streghtn
• kinetic energy is movement and is effected by mass and speed