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13 Cards in this Set
- Front
- Back
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What does it mean if an object is moving with a greater mass and a greater velocity?
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It has a greater momentum |
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P= M x V
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Momentum (kg m/s) = mass (kg) x velocity (m/s) |
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What is the unit for momentum?
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kg m/s
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What is the law of conservation of momentum?
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Whenever objects interact, the total momentum before the interaction = total momentum afterwards (with no external forces) |
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How would you investigate a collision? |
Use a computer and a monitor sensor. The mass of two trolleys are measured and then the velocity of the trolleys is measured before and after a moving trolley collides with a stationary trolley. This proves the law of conservation of momentum.
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Is momentum a scalar or a vector?
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It is a vector (has size and direction)
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What is the momentum of objects if they are at rest? |
0 |
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Why is the momentum of objects after an explosion 0? |
If two objects start stationary with a momentum of 0 and an explosion causes them to move apart with equal and opposite momentum, then the final momentum would be 0 because one direction is positive and one is negative, so they would cancel each other out. |
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What two movement are caused by the explosion when a gun is fired? |
The movement of the bullet and the recoil of the gun. |
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What happens when a force acts on an object that is able to move? |
It's momentum changes |
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For a particular change in momentum, what would make the acting force smaller? |
A longer time taken for the change in momentum.
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What do crumple zones in cars do? |
They are designed to fold in collisions, this increases the impact time and therefore reduces the force on the car. |
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What do seat belts do in cars? |
Increase the time taken for the passenger's momentum to change and therefore reduces the force of an impact. They also spread the forces on the body over a larger area and stops the wearer from flying forward if the car stops suddenly |
