Wednesday, February 24th

AgendaQuick review of Section 8.1Quiz over Section 8.1Movie: “ “

We will begin Section 8.2: Simple Machines next time

Review: Section 8.1

1. What is the definition of work?

Answer: A quantity that measures the effects of a

force acting over a distance

Review: Section 8.1

2. How much work is done by a boy who uses a force of 65 N to lift a box 1.2 meters?(Hint: Work = Force X Distance)

Answer: 78 J

Review: Section 8.1

3. What is the definition of power?

Answer: The rate at which work is done.

Review: Section 8.1

4. How much power is needed to do 180 J of work in 2.4 seconds? (Hint: power = work/time)

Answer: 75 W

Review: Section 8.1

5. What is the definition of mechanical advantage?

Answer: A quantity that measures how much a

machine multiplies force or distance.

Review: Section 8.1

6. A ramp is a type of what?

Answer: Machine

Review: Section 8.1

7. Calculate the mechanical advantage of a ramp that is 2.0 m long and 0.50 m tall.

Hint: mechanical advantage = input dist/output dist (height)

Answer: 4.0

Section 8.1 Quiz

You may use your guided notes and your book.

Movie: “ “

I will not require you to take notes on the movie but be aware that there could be a test question from the movie.