Wednesday, February 24th Agenda

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Presentation 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 What is the definition of work? Answer: A quantity that measures the effects of a force acting over a distance

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

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.

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

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

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

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

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.