T1: momentum + moments

• momentum = mass x velocity
• reduce force experienced in car = extend time for passenger to stop

  • force = momentum / time = less force produced
• momentum = the mass of an object times the velocity
• conservation of momentum: the total momentum of an object before an event is equal to the total momentum of the object after the event
• momentum in explosions is conserved, so the total momentum before and after an explosion is the same
• force = change in momentum / time
• newtons third law = every action has an equal and opposite reaction
• moment = force x perpendicular distance from pivot
• weight of body acts through centre of gravity
• principle of moments = when teh clockwise moments are equal to the anticlockwise moments there will be equilibrium
• when weight is a greater distance from pivot = more force is required to move it