Soren lifts an apple that weighs 1 N from a table, raising it through 1 m.
His lifting force does work on the apple. What exactly did the apple get out of it?
The apple got energy. Soren's force, acting through that 1 m, transferred energy to the apple.
Work is an amount of energy, so it is measured in energy's unit: the joule, symbol J.
One joule is one newton acting through one meter.
So lifting the 1 N apple through 1 m transfers 1 J to the apple.
Bigger forces and longer distances transfer more: a 5 N force acting through 2 m transfers 5 × 2 = 10 J.
You met that force-times-distance count in earlier grades. This course now reads the answer as energy moved.
Say a force did 10 J of work on a wagon, and you have said the wagon received 10 J of energy.
Talia's force of 4 N acts on a sticky drawer through 1.5 m, in the force's direction. Enter the energy transferred to the drawer in J.
Ugo says: 'A force that does 12 J of work on a cart transfers 12 J of energy to the cart.' Is Ugo correct?
A ski lift's force does 900 J of work on a chair as it tows it up the slope. How much energy does the chair receive?
The work done on an object equals the energy transferred to it.
The work done on the chair is 900 J.
The chair receives 900 J of energy.
A spring door closer exerts 3 N on a door through 0.4 m of travel, in the force's direction. How much energy does it transfer to the door?
Force times distance counts the joules.
3 × 0.4 = 1.2
The closer transfers 1.2 J to the door.
A museum crew slides a display case: Romy's force of 30 N acts on it through 2.5 m, in the force's direction. Enter the energy transferred to the case in J.
A rope's force does 18 J of work on a toboggan. Which statement is correct?
Which force-and-distance pair transfers exactly one joule?
The energy transferred when a force of one newton acts through one meter is called one ___.