In this section you will use the equation to calculate work done use the equation to calculate kinetic energy solve simple energy interchange problems.

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Presentation transcript:

In this section you will use the equation to calculate work done use the equation to calculate kinetic energy solve simple energy interchange problems

The work done on or by an object is worked out using the equation:- Work done = Force x distance W = F x d (in Joule) (in Newton) (in metres) EXAMPLE 1 A person pushes a box 15m along the ground using a force of 100N. How much work has been done? 15m Work done = X =

The work done on or by an object is worked out using the equation:- Work done = Force x distance W = F x d (in Joule) (in Newton) (in metres ) EXAMPLE 2 A person lifts a 5N box onto a table that is 1.2m high. How much work has been done on the box? How much work is done by the person getting on the table if he weighs 500N? Work done = X = on the box Click for answers Work done = X = by the person

The work done on or by an object is worked out using the equation:- Work done = Force x distance W = F x d (in Joule) (in Newton) (in metres) EXAMPLE 1 A person pushes a box 15m along the ground using a force of 100N. How much work has been done? 15m Work done = X =

The work done on or by an object is worked out using the equation:- Work done = Force x distance W = F x d (in Joule) (in Newton) (in metres ) EXAMPLE 2 A person lifts a 5N box onto a table that is 1.2m high. How much work has been done on the box? How much work is done by the person getting on the table if he weighs 500N? Work done = X = on the box Work done = X = by the person

Kinetic energy is the energy an object has because of its movement. The kinetic energy can be worked out using the equation:- Kinetic = 1 x mass x (speed) energy 2 2 (joule, J) (kilogram,kg) (m/s) 2 Example 1 Work out the kinetic energy of a person of mass 80kg falling at 50m/s K E = X X K E =

Kinetic energy is the energy an object has because of its movement. The kinetic energy can be worked out using the equation:- Kinetic = 1 x mass x (speed) energy 2 2 (joule, J) (kilogram,kg) (m/s) 2 Example 2 Work out the kinetic energy of a person of mass 80kg falling at 12m/s K E = X X K E = Click for answers

Kinetic energy is the energy an object has because of its movement. The kinetic energy can be worked out using the equation:- Kinetic = 1 x mass x (speed) energy 2 2 (joule, J) (kilogram,kg) (m/s) 2 Example 1 Work out the kinetic energy of a person of mass 80kg falling at 50m/s K E = X X K E =

Kinetic energy is the energy an object has because of its movement. The kinetic energy can be worked out using the equation:- Kinetic = 1 x mass x (speed) energy 2 2 (joule, J) (kilogram,kg) (m/s) 2 Example 2 Work out the kinetic energy of a person of mass 80kg falling at 12m/s K E = X X K E =

80m If the car weighs 8000N, how much useful work is done as it climbs the hill? WD = X =

The car has J of energy at the top of the cliff. The car has a mass of 800kg. Assume that all it’s energy is changed into kinetic energy as it falls. Work out the speed of the car as it hits the ground. K E = X X K E = Click for answers

80m If the car weighs 8000N, how much useful work is done as it climbs the hill? WD = X =

The car has J of energy at the top of the cliff. The car has a mass of 800kg. Assume that all it’s energy is changed into kinetic energy as it falls. Work out the speed of the car as it hits the ground. = V 2 X = V 2 X V 2 = V 2 = V =

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