Forces along a line can combine by addition.

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1.11 describe the effects of forces between bodies such as changes in speed, shape or direction1.12 identify different types of force such as gravitational or electrostatic 1.14 understand that force is a vector quantity 1.16 know that friction is a force that opposes motion 1.17 know and use the relationship between unbalanced force, mass and acceleration : F = M x A 1.21 describe the forces acting on falling objects (explain why falling objects reach a…