Work, Energy and Power Flashcards
Speed
Equation
Distance/Time
V=S/T
Average Speed
Equation
Total distance/Total Time
Scalar quantity
Definition
A quantity in which direction is either not applicable or not applied
e.g. Distance, Speed
Vector quantity
Definition
A quantity in which both magnitude(size) and direction must be stated
e.g. Displacement, Velocity
Velocity
Equation
Displacement/Time
Resultant Force
Definition
The overall force acting on an object
Equilibrium
When the resultant force is zero
Newton’s First Law
- If the forces acting upon an object are balanced, the resultant force on the object is zero
- If the object is at rest, it remains stationary
- It the object is moving, it remains moving at the same speed in the same direction
Terminal velocity
Definition
When the force of the air resistance matches the weight of an object so it gains no more speed
Inertia
Definition
The resistance to change in velocity
Force
Equation
Mass x Acceleration
F=ma
Work Done
Equation
Force x Distance
W=Fs
Gravitational Potential Energy
Equation
Mass x gravitational field strength x height
Ep=mgh
Kinetic energy
Equation
1/2 x mass x speed^
Ek=1/2mv^
Power
Definition
The rate of transfer of energy
