aqa as physics – mechanics exam questions and
answers
Weight
Mass x Gravitational Field Strength
Vector
A quantity with size and direction
Scalor
A quantity with size only
Newton's 2nd Law
Resultant Force = mass x acceleration
Displacement
Position of an object relative to an origin
Average Speed
Distance Travelled / Time taken
Instantaneous Speed
distance travelled in an instant / time duration of an instant
Average Velocity
Change in displacement / time taken
Velocity
Gradient of displacement / time graph
Change in Displacement
Area under a velocity / time graph
Acceleration
Rate of change in velocity
Density
Mass / Volume
Fluid
Gas or Liquid
When the velocity reaches its greatest.
Terminal Velocity
, Viscous
a substance that is thick, sticky and resistive to flow
Moment
Force x Perpendicular Distance from axis to line of action
Principle of Moments
For an object in equilibrium, about any point, the sum of the clockwise moments = the sum of the
anti-clockwise moments
Centre of Gravity
The point at which the whole weight of the body appears to act
Newton
Force needed to accelerate a 1kg mass by 1m/s²
Torque
The same as a moment
Couple
A pair of equal but opposite forces seperated by a perpendicular distance
Change in Gravitational Potential Energy
mass x gravitational field strength x change in height
Kinetic Energy
½ x mass x velocity²
Work Done
Force x Distance moved in the direction of the force
Joule
The work done by a force of 1N in moving an object 1m in the direction of the force
Power (written)
The rate of doing work
Power (equation)
Work Done / Time Taken Or Energy Converted / Time Taken
Watt
The rate of working of 1J of work done in a second
answers
Weight
Mass x Gravitational Field Strength
Vector
A quantity with size and direction
Scalor
A quantity with size only
Newton's 2nd Law
Resultant Force = mass x acceleration
Displacement
Position of an object relative to an origin
Average Speed
Distance Travelled / Time taken
Instantaneous Speed
distance travelled in an instant / time duration of an instant
Average Velocity
Change in displacement / time taken
Velocity
Gradient of displacement / time graph
Change in Displacement
Area under a velocity / time graph
Acceleration
Rate of change in velocity
Density
Mass / Volume
Fluid
Gas or Liquid
When the velocity reaches its greatest.
Terminal Velocity
, Viscous
a substance that is thick, sticky and resistive to flow
Moment
Force x Perpendicular Distance from axis to line of action
Principle of Moments
For an object in equilibrium, about any point, the sum of the clockwise moments = the sum of the
anti-clockwise moments
Centre of Gravity
The point at which the whole weight of the body appears to act
Newton
Force needed to accelerate a 1kg mass by 1m/s²
Torque
The same as a moment
Couple
A pair of equal but opposite forces seperated by a perpendicular distance
Change in Gravitational Potential Energy
mass x gravitational field strength x change in height
Kinetic Energy
½ x mass x velocity²
Work Done
Force x Distance moved in the direction of the force
Joule
The work done by a force of 1N in moving an object 1m in the direction of the force
Power (written)
The rate of doing work
Power (equation)
Work Done / Time Taken Or Energy Converted / Time Taken
Watt
The rate of working of 1J of work done in a second
