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Energy, Work Done, Springs (Momentum (The size of the force exerted by a…
Energy, Work Done, Springs
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Work Done
Energy is transferred by a force, wave or electrical current
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Momentum
The size of the force exerted by a moving object colliding with another depends on how long it takes to change momentum
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Explosions - Explosion problems are those where intitially everything in the system is stationary. After the explosion they fly apart
Before: Total momentum = 0 Kgm/s
After: Total momentum = 0 Kgm/s
Collisions - A collision problem is one where typically two objects collide travelling along the same line and stick together
Conservation of momentum - "In any collision momentum is conserved provided no external forces act on the objects involved (in a close system)
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Weight vs Mass
Weight is measured in N, Mass is measured in Kg
Weight is a vector quantity, mass is a scalar quantity
Weight is the size of the pull of gravity and depends on where you are in the universe, Mass is the amount of stuff you are made of