Mechanics And Further Mechanics Flashcards
(22 cards)
Scalar
A quantity that has magnitude but no direction
Vector
A quantity with magnitude and direction
Displacement
Distance moved in a stated direction (vector)
Speed
Distance moved per unit time (scalar)
Instantqneous Speed
The speed at an defined moment in time (scalar)
Average Speed
The distance travelled by the time taken to travel that distance (scalar)
Velocity
A vector determined by the displacement per unit time
Acceleration
A vector determined by the rate of change of velocity
Newton
One newton= the force that causes 1kg to have an acceleration of 1ms-2
Weight
The gravitational force on a body
Newtons First Law
Every body continues in its state of rest or constant velocity in a straight line unless acted on by a resultant external force
Newtons Second Law
F=ma
Newtons Third Law
Every action has an equal and opposite reaction
Centre of gravity
The centre of gravity of an object is a point where the entire weight of an object appears to act
Density
Mass per unit volume
Work Done by a force
The energy or work of a force used in moving through a displacement in the direction of the force
The Joule
The work done when a force of 1N moves 1m in the direction of the force
Energy (J)
The stored ability to do work
Conservation of energy
In a closed system energy may be converted from one form to another but cannot be created or destroyed
Gravitational Potential Energy
The energy stored in an object due to its position in the gravitational field
Kinetic Energy
The energy stored in an object due to its speed
Power
The rate of doing work
