Energy work power quiz

A force does work on an object if a portion of the force

• is perpendicular to the displacement of the object.
• is parallel to the displacement of the object.
• moves the object along a path that returns the object to its starting position.

Work is done when

• the force and displacement are perpendicular.
• te force is zero
• the displacement is zero
• the displacement is not zero

Which of the following situations requires no work to be done? Consider your vectors! (hint: carries)

• Pushing a 90 N box 10 m across a level floor at constant speed
• Lifting a 20 N cat 1 m straight up into the air
• Moving at a constant speed while carrying a 1 N burger 1 m across a level surface.
• Tossing a 10 N ball 20 m across a level yard.

Tags

NGSS.HS-PS3-2

A child moving at constant velocity carries a 2 N ice-cream cone 1.5 m across a level surface. What is the net work done on the ice-cream cone? (Hint: carries)

• 0 J
• 1.5 J
• 3 J
• 4 J

A construction worker pushes a wheelbarrow 13 m with a horizontal force of 45 N. How much work is done by the worker on the wheelbarrow?

• 6.9 J
• 135 J
• 65 J
• 585 J

A horizontal force of 150 N is applied to move a television set across a 6 m level surface. What is the work done by the 150 N force on the television set?

• 450 J
• 30 J
• 900 J
• 75 J

Tom Turkey and Peter Pumpkin each carry a 0.5 kg can of cranberry sauce up a flight of stairs (a distance of 10 m). Tom takes 7 seconds to get to the second floor while Peter takes 14 seconds. Which Thanksgiving celebrator has a higher power output?

• Tom
• Peter
• Not enough information
• They have the same power

Tags

NGSS.MS-PS3-5

What is the work done for a 800 kg car that changes its velocity from 2.25 m/s to 7 m/s?

• 2800 J
• 17575 J
• 900 J
• 4050 J

Tags

NGSS.HS-PS3-1

The work–energy theorem states that the change in the kinetic energy of an object is equal to what?

• force
• power
• work
• displacement

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

NGSS.HS-PS3-3

What is the kinetic energy of a 5 kg object moving at 3.5 m/s?

• 61.25 J
• 30.63 J
• 17.5 J
• 43.75 J