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Erstellt von HannahDarville
vor mehr als 11 Jahre
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Frage | Antworten |
Units for momentum.. | kgm/s |
Momentum is CONSERVED whenever objects.. | ..interact.As long as no external forces are acting on them. |
Energy transferred is the same as.. | ..work done. |
Units for work done.. | ..Joules (J) |
The 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) |
Side impact bars(in cars) and crumple zones 'give way' in an impact so increasing the... | ...impact time. |
Like velocity,momentum has both.. | ..size and direction. |
We can use the conservation of momentum to find the.. | ..speed of a car before an impact. |
In calculations,ONE DIRECTION must be defines as positive so momentum in the other direction must be.. | ..negative. |
The gravitational potential energy of an object depends on.. | ..its weight and how far it moves vertically. |
Firing 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. |
When vehicles collide,the force of the impact depends on mass, | change of velocity and the duration of the impact. |
When a force acts on an object that us able to move,or it is moving,its momentum.. | ..changes. |
For a change in momentum,the longer the time taken for the change, | the smaller the force acts. |
During a collision,the momentum of an object often becomes.. | 0, during the impact-the object comes to rest. |
If the IMPACT TIME is short, | the forces on the object are large.As the impact time increases the forces become less. |
Work done to overcome friction is mainly transferred into.. | ..energy by heating. |
CRUMPLE 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. |
Seat belts and air bags spread the force across the chest and they also increase the.. | ..impact time. |
Gravitational potential energy is energy stored in an object because.. | ..of its position in the Earths gravitational field. |
If an object is moved vertically upwards it gains gravitational potential energy equal to.. | ..the work done on it by the lifting force. |
Power is the rate of.. | ..transfer of energy. |
All moving objects have.. | ..kinetic energy. |
The greater the mass and the faster the speed of an object, | the more kinetic energy it has. |
All moving objects have.. | ..momentum. |
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