Mechanical Advantage
About the Lecture
The lecture Mechanical Advantage by Jared Rovny, PhD is from the course Work.
Included Quiz Questions
You use a lever to lift a heavy object. Which of the following is TRUE about the work and force you must apply, relative to not having used a lever? Assume perfect efficiency and no losses to heat.
- The work done is the same, but the force is less.
- The work done is less, but the force is more.
- The work done is more, but the force is less.
- The work done is less, but the applied force is more.
- The work done is less, and the applied force is less.
Two fixed pulleys are attached to a ceiling and are used to lift a 100 kg box. How much force do you need to apply to your rope to lift the box?
- 500 N
- 1000 N
- 100 N
- 50 N
- 250 N
A machine allows you to apply an effective force of 500 Newtons for an input force of only 25 Newtons. What is the mechanical advantage of this machine?
- 20
- 20 N
- 500
- 500 N
- 20%
What is the mechanical advantage of a frictionless slope which makes an angle of 60° with the ground? (sin (60°) = √3/2)
- 2/√3
- 3/2
- √3/2
- 2/√3 Newtons
- √3/2 Joules
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Author of lecture Mechanical Advantage
Jared Rovny, PhD
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