1). Unbalanced force = This is what cause acceleration (8)
2). Newton's second law = The law of motion states that F = ma (6)
3). Force = A push or pull (7)
4). Friction = This is a force which opposes motion (1)
5). Newton's Third Law = This law of motion states for every action there is an equal and opposite reaction. (3)
6). Gravity = This is an attractive force between an object and earth. (2)
7). Newton's First Law = This law of motion states that an object at rest stays at rest and one in motion stays in motion. (5)
8). Newton = This is the SI unit of forces (4)