Work, energy and Power 3.3

Question 1

What is the equation for work done and its standard unit?

Answer 1

Work done=force parallel to motion * distance parallel to the motion
-The standard unit is a joule which is equal to one Nm so one joule is transferred when a 1N force causes an object to be moved 1m

Question 2

Difference between work and work done?

Answer 2

-Work is scalar whereas work done is a vector quantity

Question 3

How do you calculate work done when the force is at an angle to the direction of motion?

Answer 3

-Work out the component of the force parallel to the motion using trig and use that

Question 4

What is the conservation of energy principle?

Answer 4

-The total energy of a closed system is constant and energy cannot be created nor destroyed only transferred.

Question 5

Define Power?

Answer 5

-Power is the rate of doing work and is measured in Watts or Joules per second

Question 6

What are two equations for Power?

Answer 6

-Power=work done/time taken
-Energy=Power* time

Question 7

What are the different forms of energy and the equations needed to calculate them?

Answer 7