4/14- Work

Open Ended

How would you define work?

Open Ended

What has been the hardest concept we’ve learned so far with our study of physics? Why?

Multiple Choice

What is the definition of work in physics?

• Force exerted on an object that causes it to move

• The energy stored in an object due to its position.

• The rate at which work is done.

• The force applied to an object.

Fill in the Blank

Fill in the blank: Work is calculated as force multiplied by ___.

Multiple Choice

What are the units for measuring work?

• Newtons

• Joules

• Watts

• Meters

Open Ended

Explain why no work is done when a person holds a heavy object without moving.

Open Ended

In each of the four situations shown, is work being done or not?

Multiple Choice

Who has done the most work?

• Person on left

• Person on right

Multiple Choice

What is the definition of power in physics?

• The rate at which work is done

• The amount of energy stored

• The speed of an object

• The force applied on an object

Fill in the Blank

Power is calculated as work divided by ___.

Multiple Choice

What are the units for power?

• Joules

• Watts

• Newtons

• Volts

Multiple Choice

More or less power? a) An engine can lift an object faster

• More

• Less

Multiple Choice

More or less power? b) Someone takes more time to push a car.

• More

• Less

Multiple Choice

More or less power? c) You take the same amount of time to do more work

• More

• Less

Multiple Choice

More or less power? d) Same distance; same time; more force.

• More

• Less

Multiple Choice

How much power was required to move the table if it takes 5 minutes and 3150 joules of work?

• 10.5 watts

• 105 watts

• 315 watts

• 630 watts

Fill in the Blank

What unit of measurement did James Watt create to help market his steam engine?

Multiple Choice

How did James Watt determine the value of one horsepower?

• By comparing to a car engine

• Through experiments with draft horses

• By calculating steam engine output

• By estimating coal consumption

Open Ended

What was the main topic of today's lesson?

Open Ended

What is the formula for work?

Open Ended

What is the formula for power?