Work & Power

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A 1200 kg car and a 2400 kg car are lifted to the same height at a constant speed in a auto service station. Lifting the more massive car requires ____ work.

• less

• the same

• twice as much

• four times as much

• more than four times as much

A job is done slowly, and an identical job is done quickly. Both jobs require the same amount of ____, but different amounts of ____. Pick the two words which fill in the blanks in their respective order.

• energy, work

• power, work

• work, energy

• work, power

• power, work

Which requires more work: lifting a 50.0 kg crate a vertical distance of 2.0 meters or lifting a 25.0 kg crate a vertical distance of 4.0 meters?

• lifting the 50 kg crate

• lifting the 20 kg crate

• both require the same amount of work

Anna Litical is doing the It's All Uphill Lab. She applies a 14.6-Newton force parallel to the inclined plane in order to pull a cart up a hill inclined at an angle of 39.7˚. If she drags the cart a distance of 0.93 m, then how much work does she do upon the cart?

• 10.45 J

• 133.06 J

• 102.38 J

• 13.58 J

A 10-N force is applied to push a ~2-kg block across a friction free

surface for a displacement of 5 m to the right. Determine the total

amount of work.

• 250 J

• 200 J

• 100 J

• 50 J

Lamar Gant, U.S. powerlifting star, became the first man to deadlift five times his own body weight in 1985. Deadlifting involves raising a loaded barbell from the floor to a position above the head with outstretched arms. Determine the work done by Lamar in deadlifting 300 kg to a height of 2.0 meters above the ground.

• 600 J

• 5880 J

• 1470 J

• zero J