Karteikarten
Work,energy and momentum.
Karten in diesem Stapel (25)
- 1Units for momentum..kgm/s
- 2Momentum is CONSERVED whenever objects....interact.As long as no external forces are acting on them.
- 3Energy transferred is the same as....work done.
- 4Units for work done....Joules (J)
- 5The law of the conservation of momentum is the idea that....whenever objects interact,the total momentum before the interaction is equal to the total momentum afterwards. (as long as no external forces act on them)
- 6Side impact bars(in cars) and crumple zones 'give way' in an impact so increasing the......impact time.
- 7Like velocity,momentum has both....size and direction.
- 8We can use the conservation of momentum to find the....speed of a car before an impact.
- 9In calculations,ONE DIRECTION must be defines as positive so momentum in the other direction must be....negative.
- 10The gravitational potential energy of an object depends on....its weight and how far it moves vertically.
- 11Firing a bullet is an example of an explosion.The bulet moves with a momentum in ONE DIRECTION and the gun 'recoils' with....equal momentum in the opposite direction.
- 12When vehicles collide,the force of the impact depends on mass,change of velocity and the duration of the impact.
- 13When a force acts on an object that us able to move,or it is moving,its momentum....changes.
- 14For a change in momentum,the longer the time taken for the change,the smaller the force acts.
- 15During a collision,the momentum of an object often becomes..0, during the impact-the object comes to rest.
- 16If the IMPACT TIME is short,the forces on the object are large.As the impact time increases the forces become less.
- 17Work done to overcome friction is mainly transferred into....energy by heating.
- 18CRUMPLE ZONES in cars are designed to fold in a collision.This increases the impact time and so.....reduces the force on the car and the people in it.
- 19Seat belts and air bags spread the force across the chest and they also increase the....impact time.
- 20Gravitational potential energy is energy stored in an object because....of its position in the Earths gravitational field.
- 21If an object is moved vertically upwards it gains gravitational potential energy equal to....the work done on it by the lifting force.
- 22Power is the rate of....transfer of energy.
- 23All moving objects have....kinetic energy.
- 24The greater the mass and the faster the speed of an object,the more kinetic energy it has.
- 25All moving objects have....momentum.
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- Beschreibung
- Physics Karteikarten am Work,energy and momentum., erstellt von HannahDarville am 12/05/2013.
- Erstellt von
- HannahDarville
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