Work and Power

The SI unit for work is

• watt

• Newton

• m/s

• joule

The SI unit for power is the

• Newton

• joule

• watt

• m/s

You lift a box 1.5 m straight up to put it in a truck, you exert an upward force of 200 N for 1.2 s. How much power did you use to do this?

• 225 W

• 250 W

• 160 W

• 200 W

You lift a book from the floor and place it on a table 1.0 m above the ground. How much power is used if the upward force on the book is 15 N and you do the work in 2 s?

• 15 W

• 7 W

• 30 W

• 7.5 W

How much work is done when a 25 N horizontal force is used to push a potted plant 1.5 meters across the floor?

• 37.5 j

• 16.7 j

• 25 j

• 0 j

Work is the product of

• time and force

• power and force

• motion and force

• force and distance

The SI Unit for Time

• Newton (N)
• Joule (J)
• Second (s)
• Watt (W)

A waiter carries a 2.0 N tray 10 meters to your table, how much work is done?

• 10 j

• 0 j

• 5 j

• 20 j

A student exerts a force of 500 N pushing a box 10 m across the floor in 4 s. How much work does the student perform?

• 500 j

• 1250 j

• 125 j

• 5000 J

What does one newton exerted over a distance of one meter equal?

• One watt
• One hertz
• One volt 
• One joule