Transcript 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 Review: Section 8.1 1.

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
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.