Summary

• A scalar quantity has a magnitude but no direction.

• Examples of scalar quantities include distance, speed, time, power and energy.

• A vector quantity has a magnitude and a direction.

• Examples of vector quantities include displacement, velocity, acceleration, force and momentum.

• Distance is a measurement of the actual path travelled by an object.

• Displacement is a measurement of how far away an object is from its original position.

• Speed is a measure of how fast something moves.

• It is measured in units such as metres per second (m/s) and kilometres per hour (km/hr).

• Average speed is an overall measurement of speed between two points in time.

• Instantaneous speed is a measure of speed at a particular point in time.

• Average speed can be calculated using the formula:

• Speed can be converted from m/s to km/hr by multiplying by 3.6.

• Speed can be converted from km/hr to m/s by dividing by 3.6.

• Distance travelled can be calculated using the formula:

• Time taken can be calculated using the formula:

• Velocity is a measure of the rate at which displacement changes.

• It can be calculated using the formula:

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