Distance, Displacement, Speed and Velocity
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What are scalar quantities?
Physical quantities that only have a magnitude
List some scalar quantities.
• Speed • Distance • Mass • Energy • Temperature • Time
What are vector quantities?
Physical quantities that have both direction and magnitude
List some vector quantities.
• Force • Velocity • Displacement • Weight • Acceleration • Momentum
What is distance?
How far an object has moved
What is displacement?
The distance and direction in a straight line from an object’s starting point to its finishing point
What is speed?
How fast something is moving
What is velocity?
Speed in a given direction
What are speed and velocity measured in?
metres per second, m/s
What are distance and displacement measured in?
metres, m
What is the equation to calculate speed?
Speed = distance ÷ time
Recall some typical speeds for different methods of transport.
• Walking - 1.4m/s • Running - 3m/s • Cycling - 5.5m/s • Cars in urban area - 13m/s • Cars on motorway - 31m/s • Trains - 55m/s • Aeroplanes - 250m/s • Ferries - 15m/s • Wind speed 5-20m/s • Speed of sound in air - 340m/s