Definitions Flashcards
Coefficient of restitution-
The fraction of speed the ground gives back 0
Momentum
mass x velocity
Impulse
Measure of whack, A body’s change in momentum
Scalar quantity
Has no direction
Vector quantity
has a direction
Angle of deflection
Angle between line particle would have travelled and the line the particle actually travelled
Tonne
1000kg
Kilo Watt
1000W
Uniform speed
no acceleration
Power
rate at which work is one
Work done
Force in direction of motion x distance travelled
M cubed of water
1000l or 1 tonne mass
Energy
the capacity of a body to do work
Potential energy
Energy a body has due to its position
Kinetic energy
Energy a body has due to its motion
Principle of Conservation of energy
The total energy of an isolated system remains constant. Energy can neither be created nor destroyed only transformed or transferred from one form to another.Force- causes objects to move
Mass
it’s quantity of matter
Newton’s first law
Body will continue in a state of rest or uniform motion unless it is compelled to change that state by an external force applied to it
Newton’s second law
The change in momentum per unit time is proportional to the applied force and takes place along the straight line in which the force acts
Newton’s third law
To every action there is an equal and opposite reaction
Normal reaction force
Perpendicular to the surface of contact
Tension
Force on objects by strings
Friction
Force that opposes motion
Limiting friction
Only a certain amount of friction can be called into play before object moves- this is called the limiting friction
