Work and Machines

A 5 N box is pushed horizontally 10 m. How much work was done?

• 5 J

• 15 J

• 50 J

• 2 J

How much work do you do when you lift a 2.5 N book to put it on a 2.5 m shelf?

• 6.25 J

• 7 J

• 5 J

• 0 J

Oliver is pulling a wagon and the data is graphed here. How much work did Oliver transfer to the wagon?

• 28 J

• 280 J

• 80 J

• 160 J

Which of the following situations is work NOT done?

• Pushing a box across the floor.

• Pulling a wagon.

• Holding a book over your head.

• Friction on a box moving across the floor.

Calculate the work done by the forces in the graph.

• 160 J

• 80 J

• 20 J

• 28 J

What unit do we use for work?

• Newtons

• Joules

• Meters

• kg

In which situation is the most work done on the block?

• 1

• 2

• They are the same

The definition of work is:

• The force applied through a distance.

• The difference between input and output force.

• The energy stored by an object.

• The energy Mrs. Baker has after she drinks her coffee.

Ben is helping to push his brother up a 20m ramp in a wheelchair. If Ben has to use 65N of force to push him, how much work did Ben do?

• 13 J

• 1300 J

• 130 J

• 20 J