Force and Momentum
- Created by: Kam Seward
- Created on: 21-03-22 18:50
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- Force and Momentum
- Momentum and Impulse
- Momentum = mass x velocity
- An object stays at rest or constant speed unless acted on by another object
- Force = mv -mu / t
- F = ma
- Initial momentum = mu
- Final momentum = mv
- Impulse = change in (mv)
- Impulse = Force x time
- Impact Force
- If the direction of momentum changes, the sign (+ or -) changes
- Impact force = gain of momentum / contact time
- Gain / change of momentum = mv-mu
- Force = mv - mu / t
- Conservation of momentum
- The principle of conservation of momentum states the total momentum remains constant, provided no external resultant force acts on the system.
- Every action has an equal and opposite reaction.
- Force = Change in momentum / time
- (M1V1 = M2V2) -> This is the conservation of momentum
- Elastic and inelastic collisions
- An elastic collision is one where there is no loss of kinetic energy
- An inelastic collision occurs where the colliding objects have less kinetic energy after the collision than before the collision
- Total energy is always conserved, but kinetic energy may be transferred into other energy stores.
- Using the conservation of momentum, if we know both the masses of the colliding objects and one of their velocities, we can work out the other velocity using; mv = m1v1
- Explosions
- When two objects get fired away from each other when initially being at rest they recoil from each other with equal and opposite momentums
- If you use the conservation of momentum for this chapter then you will be fine.
- Remember that energy can be transferred to heat, sound, light or chemical energy.
- Momentum and Impulse
- Impact Force
- If the direction of momentum changes, the sign (+ or -) changes
- Impact force = gain of momentum / contact time
- Gain / change of momentum = mv-mu
- Force = mv - mu / t
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