Work, Energy and Momentum - AQA GCSE Physics Additional

Revision notes on Work, Energy and Momentum

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Physics ­ Work, Energy and Momentum:
Energy and Work:
When an object is moved using a force, work is done on the object by the
Work Done = Energy Transferred
The work done depends on the size of the force and the distances moved.
Work Done(J) = Force(N) x Distance moved in direction of force(m)
Eg.) If a weightlifter lifts a weight of 200N to a height of 1.5m, how much
work is done?
A) 200N x 1.5m = 300J.
Work Done to overcome friction is mainly transferred into heat energy.
Kinetic Energy:
The kinetic energy of an object is the energy it has due to its movement.
This depends on the mass and the speed of the object.
Kinetic Energy = ½ x mass x speed2
If you double the speed, the kinetic energy quadruples.
The heavier the ball and the quicker the speed, the more kinetic
Elastic Potential Energy:
Elastic potential energy is the energy stored in an object when work is done
to change its shape
Momentum(Kgm/s) = Mass(Kg) x Velocity(m/s)
Momentum is conserved when objects interact, provided that there are
no external forces acting.
The Total Momentum before a collision is equal to the total
momentum after a collision.

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Eg.) If a 0.8kg gun fires a 0.05Kg bullet at 400m/s, at what speed does
the Gun recoil?
Momentum = 0.05 x 400
= 20Kgm/s
(Mass of A x Velocity of A) = (Mass of B x Velocity of B)
Change in Momentum
Force(N) = Change in momentum(Kgm/s) F = force
Time(s) m = mass
V = final velocity
F = mv ­ mu u = start velocity
t t = time
Making the time longer decreases the size of the force.…read more


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