# Unit 6 Physical Science Review: Question Preview (ID: 27713)

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 Which of the following is the best definition of work? a) Work occurs when energy acts on an object b) Works occurs when a force acts on an object c) Work occurs when a force acts to hold an object in place d) Work occurs when a force acts on an object and it causes displacement of that object Work is a product of: a) Force and Distance b) Force and Mass c) Force and Energy d) Distance and Mass What is the correct equation for calculating work? a) Work=Force x Mass b) Work=Force x Distance c) Work=Force/Mass d) Work=Force/Distance What is the goal of a simple machine? a) Simple machines increase the amount of work b) Simple machines reduce the amount of work c) Simple machines keep the work the same but make the work easier d) Simple machines keep the work the same but make work more difficult Which of the following is an inclined plane wraped around a rod? a) Lever b) Pulley c) Wedge d) Screw Mechanical advantage describes how simple machines . . . . a) Multiply the input Force b) Reduce the input Force c) Increase the amount of work that is done d) Decrease the amount of work that is done Which of the following is a simple machine? a) A Car b) A screwdriver c) A lightbulb d) A doorbell What is Power? a) Power is the amount of force over a distance b) Power is the rate at which work is done c) Power is mass over distance d) Power is the amount of work that is done. A watt is a unit of . . . a) Light b) Power c) Heat d) Time When you cut a board with a power saw as compared with a handsaw, how much work do you do with the power saw? a) More work in less time b) Less work in less time c) Same amount of work in less time d) Less work in more time What is power the quotient of? a) Work and Distance b) Speed and energy c) Force and mass d) Work and Time How are moving pulleys different from fixed-position pulleys? a) Moving pulleys are attached to the object and move with the object. Fixed-position pulleys are connected to a fixed point and b) Moving pulleys are easier to use than fixed-position pulleys. c) Moving pulleys are attached to the object and are stationary. Fixed-position pulleys are connected to a fixed point and move d) Moving pulleys have more force than fixed-position pulleys.
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