Forces and Motion

Forces make things start moving, stop moving or change direction. This unit covers speed, acceleration and the link between force, mass and acceleration.

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Describing motion

Speed is how far something travels in a set time, worked out as distance divided by time.
Velocity is speed in a stated direction.
Acceleration is how quickly velocity changes over time.
Speed is measured in metres per second (m/s).

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1. Which equation links force, mass and acceleration?

2. A car travels 100 m in 20 s. What is its average speed?

3. If the forces on a moving object are balanced (resultant force is zero), the object will do what?

4. What is the weight of a 5 kg object on Earth, where g is 10 N/kg?

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