What is 'work'?
The work done on an object is the energy transferred to an object in the direction of the force
what effects the work done?
the force and the distance moved
what is the equation to calculate work done?
Work done (J) = Force (N) x distance moved in the direction of the force (M)
what is the equation for the change in GPE?
Chane in GPE = wieght (N) x change of height (M)
what is the main transformation of energy due to friction?
What is kinetic energy?
The kinetic energy of an object is the energy it has due to its motion
what effects an object's kinetic energy?
its mass and its speed
what is the equation for kinetic energy?
Kinetic energy (J) = 0.5 x mass (Kg) x speed2 (m/s2)
what is stored in a rubber band when it is stretched?
elastic potential energy
what is an elastic object?
an object which regains its shape after being stretched or squashed
what is the law of the conservasion of momentum?
Momentum is conserved in any collision or explosion provided no external forces acts on the objects that collide or explode
what is the equation for momentum?
Momentum = mass x velocity
what is the equation which shows us that two objects explode with an equal and opposite force?
(mass of A x velocity of A) = - (mass of B x velocity of B)
what is the effect of a 'crumple zone'?
it increases the impact time, therefore decreasing the force
What is the equation for the force in a collision or explosion?
Force = change of momentum ~ (divided by) ~ time taken