2. Wednesday, February 24th Agenda
Quick review of Section 8.1
Quiz over Section 8.1
Movie: “ “
We will begin Section 8.2: Simple Machines next time

3. Review: Section 8.1
What is the definition of work?
Answer: A quantity that measures the effects of a force acting over a distance

4. Review: Section 8.1 Answer: 78 J
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

5. Answer: The rate at which work is done.
Review: Section 8.1
What is the definition of power?
Answer: The rate at which work is done.

6. Review: Section 8.1 Answer: 75 W
How much power is needed to do 180 J of work in 2.4 seconds?
(Hint: power = work/time)
Answer: 75 W

7. Review: Section 8.1
What is the definition of mechanical advantage?
Answer: A quantity that measures how much a machine multiplies force or distance.

8. Review: Section 8.1
A ramp is a type of what?
Answer: Machine

9. Review: Section 8.1 Answer: 4.0
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

10. Section 8.1 Quiz
You may use your guided notes and your book.

11. 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.