# GCSE Physics - P3: Forces and Motion

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Speed
Distance moved / time taken. How fast something is moving
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*Average Speed*
Total distance traveled / the time taken
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Speed Camera
Camera used to find the speed of a vehicle
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Distance-time Graphs
Graph showing the distance on the y-axis and time on the x-axis. It shows the distance traveled from a certain point at a particular moment
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Slope of a graph
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Stationary
Not moving, at rest
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Line on a graph whose y-value increases as the x-value increases
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Line on a graph whose y-value decreases as the x-value increases
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Acceleration
Speeding up, slowing down or changing direction. Change in velocity per second measured in m/s squared
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Deceleration
An acceleration which involves the slowing down of an object
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Velocity
How fast something is moving in a certain direction
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Relative Velocity
How fast one object is moving as measured from another object
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Speed-Time Graph
Graph with speed on the y-axis and time on the x-axis. It shows the speed of an object at a particular moment
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Mass
Amount of matter in a object. It is measured in kilograms
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*Resultant Force*
Single force that would have the same overall effect of all the forces combined
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Breaking Distance
Distance moved by a vehicle when it slows down and stops after the breaks have been applied
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Reaction Time
Time taken from seeing a hazard to starting to press the break peadle
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Thinking Distance
Distance traveled by a vehicle in the reaction time
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Stopping Distance
Sum of the thinking distance and breaking distance
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Work Done
Energy transferred, measured in joules. Work is done whenever a force moves a distance. Work done = force applied x distance moved in the direction of the force
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Joule
Unit of energy or work done
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Power
Work done (or energy transferred) in a given time. Measured in watts
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Watt
Unit of power
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Kinetic Energy
Energy any object has when it is moving
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Fossil Fuel
Fuel that was formed by the decay of the remains of creatures that lived millions of years ago. Coal, oil, and natural gas are all fossil fuels.
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Biofuel
Liquid fuel similar to diesel, made from plants
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Fuel Consumption
Measure of the efficiency of an engine that burns fuel. A more efficient vehicle has lower fuel consumption and so travels a greater distance using the same amount of fuel
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Momentum
Mass of an object x velocity
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ABS Breaks
Means of stopping a car without skidding by rapidly turning the breaks on and off
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Traction Control
Means of preventing cars skidding by trolling the power delivered to each wheel
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Set of leavers and buttons that allow the driver of a car to turn devices on and off without taking hands off the wheel
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Weigth
Force on an object due to the force of gravity on a planet
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Acceleration Due to Gravity
Rate of change of velocity due to the force of gravity
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Fluid
A liquid or a gas
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Terminal Speed
Maximum speed of an object when the forces on it are balanced. Usally applied to objects falling under gravity
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Gravitational Potential Energy
Energy an object has when it is above the ground
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## Other cards in this set

### Card 2

#### Front

Total distance traveled / the time taken

*Average Speed*

### Card 3

#### Front

Camera used to find the speed of a vehicle

### Card 4

#### Front

Graph showing the distance on the y-axis and time on the x-axis. It shows the distance traveled from a certain point at a particular moment

Slope of a graph