Work and energy

What is the unit used to measure work?

• Joule
• Watt
• Newton
• Pascal

Tags

NGSS.HS-PS2-1

What kind of energy is in a moving skateboard?

• Potential
• Kinetic

Tags

NGSS.HS-PS3-2

When work is done, there is always a(n) _______.

• constant rate
• single movement involved
• transfer of energy
• increase in the mechanical advantage

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4

In which scenario is work = 0 J ?

• Pushing a stationary wall

• Pulling a trolley car

• Pushing a book across the table

• Dropping a set of keys from a height, h.

The coefficient of kinetic friction between a large box and the floor is 0.21. A person pushes horizontally on the box with a force of 165 N for a distance of 2.8 m. If the mass of the box is 72 kg, what is the total work done on the box? (Round your answer to a whole number)

• 51

• 49

• 47

• 45

Tags

NGSS.HS-PS3-1

You raise a bucket of water from the bottom of a well that is 12 m deep. The mass of the bucket and the water is 5.00 kg, and it takes 15 s to raise the bucket to the top of the well. How much power is required?

• 39 W

• 41 W

• 43 W

• 45 W

Tags

NGSS.HS-PS3-1

As a pendulum swings from its highest to lowest position, what happens to its kinetic and potential energy? 

• Both the potential energy and kinetic energy decrease
• The potential energy decreases while the kinetic energy increases 
• The kinetic energy decreases while the potential energy increases 
• Bothe the potential energy and kinetic energy increase 

Tags

NGSS.MS-PS3-5

When a pendulum swings, at which point is kinetic energy highest?

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS3-1

A 60.0-kg ball of clay is tossed vertically in the air with an initial speed of 4.60 m/s.  Ignoring air resistance, what is the change in its potential energy when it reaches its highest point? 

• 0 J
• 635 J
• 280 J
• 2700 J

Tags

NGSS.HS-PS3-1

A student weighing 700 N climbs at constant speed to the top of an 8 m vertical rope in 10 s.  The average power expended by the student to overcome gravity is most nearly

• 1.1 W
• 87.5 W
• 875 W
• 560 W