Work and energy

Question 1

There are several different types of energy, can you state and describe 6 types?

Answer 1

Potential energy - energy due to position.

Kinetic energy -Energy due to motion.

Thermal Energy - energy due to the temperature of an object.

Chemical or Nuclear Energy - Energy associated with chemical or nuclear reactions.

**Electrical Energy **- Energy of electrically charged objects.

Elastic Energy - Energy stored in an object when it is stretched or compressed.

Question 2

What is the principle of conservation of energy?

Answer 2

Energy cannot be created or destroyed.

Question 3

When an object is moved it gains Energy, what is the equation the governs this?

If a 5 N weight is raised 0.5m what was the work done to raise said object?

Answer 3

Work Done = Force x distance moveed in the direction of the force.

5N x 0.5m = 2.5J

Question 4

When an object is acted upon by a force in a given direction we can use an equation to calculate it. What is this equation?

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Answer 4

Work done = Force x Distance X Angle of direction of motion (Cos Theta)

Question 5

Calculate the energy transferred by a force of 12 N when it moves an object by a distance of 4.0m? Then calculate the work done when the energy was in a direction at 60 degrees to the direction of the force.

Answer 5

Work = Force x Distance

12 x 4 = 48J

48J x Cos(60) = 24J