| A | B |
|---|
| linear motion | motion alomg a straight-line path |
| reciprocating motion | an alternating backwards and forwards motion often linked to rotational motion |
| rotational motion | motion along a curved or circular path |
| oscillating motion | motion back and forth around a central point or axis |
| force | a push or pull |
| balanced forces | two equal strengthed forces acting in opposite direction |
| unbalanced force | a greater strengthed force acting upon a lesser strengthed force in a different direction |
| friction | a force that resists motion |
