Physics 2.2

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  • Created by: Laura
  • Created on: 11-01-13 16:08

What is work and work done?

Work is giving energy to an object and is measured in joules.

Work done is the product of force applied to an object in newtons and the distance the object moved in the direction of the force in metres.

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What is the equation for work done?

Work Done = Force Applied x Distance Moved In The Direction Of The Force              W  
                                                                                                                                      F | d
W = F x d

Work Done is measured in joules, j.
Force Applied is measured in newtons, N.
Distance is measured in metres, m.

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What is the equation for power?

Power = Energy Transfered              P = E                    E   
                   Time Taken                           t                   P | t

Power is measured in in watts, W.
Energy Transfered is measured in joules, j.
Time Taken is measured in seconds, s.

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The equation for gravitational potential energy?

Gravitational Potential Energy = Mass x Gravitational Field Strength x Change In Height
Ep = m x g x h

Gravitational Potential Energy is measured in joules, j.
Mass is measured in kilograms, kg.
Gravitational Field Strength is measured in newtons per kilograms, N/kg.
Change In Height is measured in metres, m.

The gravitational potential energy is the energy that an object has due to its vertical position in the gravitational field.

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What is the equation for kinetic energy?

Kinetic Energy = 1/2 x Mass x Speed²
Ek = 1/2 x m x v²

Kinetic Energy is measured in joules, j.
Mass is measured in kilograms, kg.
Spped is measured in metres per second, m/s.

The kinetic energy of an object is the energy it has due to motion.

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What is the equation for momentum?

Momentum = Mass x Velocity                           p = m x v                        p  
                                                                                                             m | v
Momentum is measured in kilograms metres per second, kg m/s.
Mass is measured in kilogram, kg.
Velocity is measured in metres per second, m/s.

Momentum is a fundemental property of moving objects and depends on the mass of the object and the velocity of the object. Also momentum has to have size and direction.

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What is the law of the conservation of momentum?

The law of the conservation of momentum is that it is a closed system meaning that the total momentum before and after an even is equal, so no momentum is lost.

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