Forces and motion

• Newtons First Law : An object will remain stationary or at a constant velocity unless acted upon by an external force
• Newtons Third Law : When two objects interact, the forces they exert on each other are equal and opposite
• Vectors have a magnitude (size) and direction

  e.g acceleration
• Scalars are quantities with a magnitude (size) only, no direction

  e.g temperature
• Force = spring constant x compression
• Weight = mass x gravitational field strength
• Work done = Force x distance moved