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Physics : Forces 3


In this topic, students build on their knowledge of forces from Year 7 and Year 8. There is a greater focus on the impact of forces on the speed, velocity and acceleration of objects.

The main SMSC/Personal Development content of this topic includes: PD22 – Use of a range of social skills in different contexts, for example working and socialising with other pupils, including those from different religious, ethnic and socio-economic backgrounds.

The main UN Rights of a Child covered are No. 13 – Sharing thoughts freely and No. 28 – Access to Education

Example Key Words


A quantity that has magnitude only e.g. speed, distance


A quantity that has magnitude and direction e.g. a force, velocity

Resultant Force

The overall force acting on an object, which is most often the sum of multiple individual forces. This should have magnitude and direction.


An object that speeds up is accelerating. The average acceleration of an object can be calculated using the equation acceleration = change in velocity/time taken


A mathematical term which describes the relationship between two variables. If one increases the other increases by the same factor. E.g. if one doubles, the other also doubles.

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