Work Power and Efficiency

The unit of work was named after...

• James Watt
• Isaac Newton
• James Joule
• Renee Descartes

The unit of power was named after...

• James Watt
• Isaac Newton
• James Joule
• Renee Descartes

Power is a measure of how much ______ can be done in a set amount of ______.

• Work, Time
• Work, Energy
• Energy, Force
• Force, Work

Work is a measure of the energy needed to apply a force across a _______.

• time
• distance
• gravity
• object

Efficiency is a ______ of what you put in versus what you get out of a system.

• source
• ratio
• multiplication
• addition

Tags

NGSS.HS-ETS1-3

An object has a weight of 200 N and is moved 3 meters.  How much work is done?

• 66.7 J
• 600 J
• 203 J
• 0.015 J

Tags

NGSS.HS-PS3-1

A light bulb consumes 100 Watts.  If it is left on for 20 seconds, how much work does it do?

• 5 J
• 2,000 J
• 0.2 J
• 100 J

Efficiency is....

• measured in Joules.
• a percentage.
• measured in Watts.
• measured in Newtons.

Tags

NGSS.HS-PS3-3

For there to be work, there must always be distance.

• True
• False

Power does not depend on...

• strength
• work
• time
• any of these