# Simple Machines Review: Question Preview (ID: 27782)

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 What is an example of work being performed? a) Pushing against a stationary wall b) Holding a 100 pound bar bell c) Pushing a lawn mower 100 yards d) Marching in place What type of simple machine is the lid of a jar of applesauce? a) Screw b) Wheel and axle c) Lever d) Wedge Which of the following is a complex machine? a) Lever b) Axe head c) Pulley d) Bicycle A moveable pulley reduces force, while a fixed pulley a) Exerts a steady force b) Shortens the distance between the force and the object c) Resists the object's tendency to slide d) Only changes the object's direction. What simple machine is used to raise the blinds? a) Lever b) Pulley c) Screw d) Wheel and axle What is an independent variable? a) What I change b) What changes because of what was changed c) What doesn't change d) There's no such thing A _____ is made of a rigid bar and fulcrum a) Wheel and axle b) Pulley c) Screw d) lever If you wanted to lift a heavy box using a lever, then you should a) Move the fulcrum closer to you b) Move the fulcrum closer to the box c) Move the fulcrum to the middle d) Move the box as far as possible from the fulcrum A simple machine is a device that a) Makes work harder b) Reduces the amount of force required to do work c) Reduces the amount of work to be done d) Increases the amount of work that needs to be done Newtons are used to measure a) Force b) Distance c) Time d) Work Work can be defined as a) A push or pull on an object that causes it to move b) A force exerted on an object that causes it to move c) All of the above d) Tony uses a wheel chair, he needs to build a ramp for a door that is 3 feet off the ground. What length ramp should he use? a) 3 m b) 6 m c) 9 m d) 12 m What is a dependent variable? a) What I change b) What changes because of what was changed c) What never changes d) There's no such thing
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