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Work And Simple Machines (7.P.2.4)
Test Description: Work and Simple machines
Instructions: Answer all questions to get your test result.
1) What is the formula for work?
A
W = F-d
B
W = F +d
C
W = F/d
D
W = F x d
2) How can simple machines make work easier?
A
by removing the force of gravity on the object
B
by adding more work on the object than originally applied.
C
by increasing the friction between the machine and the object
D
by decreasing the force needed to complete the task
3) Which simple machine would be the most efficient for lifting an object 30 m off the ground?
A
pulley
B
wedge
C
lever
D
screw
4) Which of the following situations is work?
A
pushing against a stone wall
B
lifting a box off the ground
C
carrying a box across a room
D
holding a box
5) Simple machines decrease the amount of work. True or False?
A
True
B
False
6) Efficiency is never 100% because of friction. True or False?
A
True
B
False
7) A machine is a device that makes work easier by changing the size or direction of a force. True or False?
A
False
B
True
8) a simple machine that has a bar that pivots at a fixed point called a fulcrum
A
inclined plane
B
lever
C
pulley
D
wheel and axle
9) a simple machine that consists of a wheel over which a rope, chain, or wire passes
A
lever
B
inclined plane
C
pulley
D
wheel and axle
10) a simple machine that consists of two circular objects of different sizes
A
lever
B
wheel and axle
C
inclined plane
D
pulley
11) A simple machine that is a straight, slanted surface, and facilitates the raising of loads
A
wheel and axle
B
inclined plane
C
pulley
D
lever
12) two or more simple machines put together
A
simple machine
B
compound machine
*select an answer for all questions
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