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# Unit 2: Kinematics

### Physics 11

Displacement the distance between the initial and final position
Speed the rate of change of distance with time
Velocity the rate of change of displacement with time
Acceleration the rate of change of velocity with time
Instantaneous Velocity velocity of an object at a particular moment in time
Newton's 1st Law an object continues in uniform motion in a straight line unless a force acts
Newton's 2nd Law force= mass x acceleration (the rate of change of momentum)
Newton's 3rd Law for every action there is an equal and opposite reaction
Translational Equilibrium no resultant force in any direction
Impulse change of momentum
The law of conservation of linear momentum in an isolated system, momentum remains constant
Work force x distance moved in the direction of the force
The principle of the conservation of energy energy cannot be made of destroyed, only changed from one form to another
Inelastic Collision when there is a change in kinetic energy
Elastic Collision when there is no changed of kinetic energy
Power is the rate at which energy is transferred
Efficiency the ratio of useful energy to the energy transferred
Created by: jakiday