Topic 1 – Motion and Forces
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25 Terms
Distance
Distance is the total length of the path travelled by an object regardless of direction
Displacement
Displacement is the straight line distance from the starting point to the finishing point including direction
Speed
Speed is the distance travelled per unit time
Velocity
Velocity is speed in a given direction
Scalar Quantity
A scalar quantity has magnitude only and no direction
Vector Quantity
A vector quantity has both magnitude and direction
Acceleration
Acceleration is the rate of change of velocity per unit time
Distance Time Graph Gradient
The gradient of a distance time graph represents the speed of the object
Distance Time Graph Flat Line
A flat line on a distance time graph shows the object is stationary
Velocity Time Graph Gradient
The gradient of a velocity time graph represents acceleration
Velocity Time Graph Area
The area under a velocity time graph represents the distance travelled
Contact Force
A contact force acts only when two objects are touching
Non Contact Force
A non contact force acts over a distance without physical contact
Resultant Force
The resultant force is the single force that has the same effect as all the forces acting together
Newton First Law
An object remains at rest or moves at constant velocity unless acted upon by a resultant force
Newton Second Law
The acceleration of an object is proportional to the resultant force and inversely proportional to its mass
Newton Third Law
For every action force there is an equal and opposite reaction force acting on a different object
Circular Motion
An object moving in a circle is accelerating because its direction is constantly changing
Centripetal Force
The force responsible for circular motion acts towards the centre of the circle
Momentum Definition
Momentum is equal to mass multiplied by velocity
Conservation of Momentum
In a closed system the total momentum before an event equals the total momentum after the event
Stopping Distance
Stopping distance is the sum of thinking distance and braking distance
Thinking Distance Factors
Thinking distance is affected by reaction time speed tiredness alcohol and drugs
Braking Distance Factors
Braking distance is affected by speed mass brakes tyres and road conditions
Note 
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