Work and Power

Question 1

what do we mean when we talk about doing work?

Answer 1

we mean a force that is needed to move an object. therefore, work is also a measure of how much energy is transferred

Question 2

work equation

Answer 2

work = force x distance

J = N x m

Question 3

whenever something ____, something is _____ some sort of____ to move it.

Answer 3

moves, providing, effort

Question 4

the thing ____________ needs a _____. of energy

Answer 4

putting in energy, supply

Question 5

what is power?

Answer 5

power is a measure of how quickly work is done. it is the rate at which something transfers energy from one form to another

Question 6

power equation

Answer 6

power = work done / time taken

Question 7

what is power measured in?

Answer 7

watts or joules per second (W OR J/s)

Question 8

when is work done?

Answer 8

when the application of a force results in movement

Question 9

the amount of work done depends on?

Answer 9

the magnitude of the force and the distance moved in the direction of the force.

Question 10

a man has a mass of 65kg. he climbs a ladder rising a vertical height of 2m. calculate the work the man does by lifting his weight up the ladder

Answer 10

formula for weight: w=mg

weight is a force, so use weight in formula for work done w=fd