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Forces arise from the interactions of two objects. They can be divided into two categories: contact forces and non-contact forces.

The movement of objects can be described using motion graphs and numerical values. These are both used to help in the design of faster and more efficient vehicles.

Unbalanced forces on an object will change its motion. Ideas about force and momentum can be used to explain road safety measures.

Energy stored in a moving object is called kinetic energy. As an object is raised above ground its gravitational potential energy increases. When a force moves an object work is done.