Work and Power Concepts

Front

A force does work on an object if a component of the force is parallel to the displacement of the object.

Back

True

Front

Work is done when the displacement is not zero.

Back

True

Front

Average power output of a 1.00 × 10³ kg sports car accelerating from rest to 25.0 m/s in 7.50 s.

Back

41.7 kW

Front

The more powerful the motor, the shorter the time interval for doing the work is.

Back

True

Front

Magnitude of the component of the force that does the work is 43.0 N. Work done on a bookshelf pulled 5.00 m at an angle of 37.0° from the horizontal.

Back

172 J

Front

Net work done on a wheelbarrow pushed with a horizontal force of 50.0 N over a level distance of 5.0 m with a frictional force of 43 N.

Back

35 J

Front

Net work done on a 2 N ice-cream cone carried 1 m across a level surface at constant velocity.

Back

0.0 J

Front

Work done by a construction worker pushing a wheelbarrow 5.0 m with a horizontal force of 50.0 N.

Back

250 J

Front

Sum of kinetic energy and all forms of potential energy

Back

Mechanical energy

Front

Kinetic energy of a 3.00 kg toy falling from a height of 10.0 m (g = 9.81 m/s²) just before hitting the ground

Back

294 J