Motion laws

• What is newtons first law?

  An object will remain at constant velocity unless acted upon by an external force
• What is newtons second law?


  The acceleration is directly proportional to the force applied and inversely proportional to the objects mass
• What is the equation for newtons second law?

  F=ma
• What is impulse?

  Change in momentum.

  The product of force and the time over which it is applied
• What is newtons third law?

  Every action has an equal and opposite reaction
• What is the law of conservation of energy?


  Energy cannot be created or destroyed it can only be transferred between different forms
• What is done when energy is transferred between different forms?


  Work is done
• State the equation for work done


  WD = f × d
• What must be done before calculating work done?

  The force must be resolved so that the component in the direction of motion can be used
• State an equation linking work done and power

  P = WD / t
• What must be done when dealing with projectile motion questions?

  Consider the horizontal and vertical components of the motion separately
• What is the equation for kinetic energy?

  $E_k =$$(1/2)×m×v^2$
• What is the equation for gravitational potential energy?


  $E_g=$$m×g×h$