Work And Simple Machines (7.P.2.4) Question Preview (ID: 37789)


Work And Simple Machines. TEACHERS: click here for quick copy question ID numbers.

What is the formula for work?
a) W = F x d
b) W = F/d
c) W = F +d
d) W = F-d

How can simple machines make work easier?
a) by increasing the friction between the machine and the object
b) by decreasing the force needed to complete the task
c) by adding more work on the object than originally applied.
d) by removing the force of gravity on the object

Which simple machine would be the most efficient for lifting an object 30 m off the ground?
a) screw
b) lever
c) wedge
d) pulley

Which of the following situations is work?
a) carrying a box across a room
b) pushing against a stone wall
c) holding a box
d) lifting a box off the ground

Simple machines decrease the amount of work. True or False?
a) True
b) False
c)
d)

Efficiency is never 100% because of friction. True or False?
a) True
b) False
c)
d)

A machine is a device that makes work easier by changing the size or direction of a force. True or False?
a) True
b) False
c)
d)

a simple machine that has a bar that pivots at a fixed point called a fulcrum
a) lever
b) pulley
c) wheel and axle
d) inclined plane

a simple machine that consists of a wheel over which a rope, chain, or wire passes
a) lever
b) pulley
c) wheel and axle
d) inclined plane

a simple machine that consists of two circular objects of different sizes
a) lever
b) pulley
c) wheel and axle
d) inclined plane

A simple machine that is a straight, slanted surface, and facilitates the raising of loads
a) lever
b) pulley
c) wheel and axle
d) inclined plane

two or more simple machines put together
a) compound machine
b) simple machine
c)
d)

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