# Physics: Chapter 9 Question Preview (ID: 8632)

### Part 3.[print questions] Answers? Play games to get them!

Levers, inclined planes (and most simple machines) increase input force at the expense of what?
a) input distance
b) output work
c) output force
d) input work

No machine can every be 100 percent efficient in real life.
a) True
b)
c)
d) False

Pulleys are capable of all of the following EXCEPT
a) multiplying input forces
b) creating energy
c) multiplying input forces and changing the direction of input forces
d) changing the direction of input force

In which type of lever is the fulcrum located in between the load and the input force?
a) 1
b) not possible
c) 3
d) 2

A pulley system consists of 3 pulleys that lift a 1500 N crate 500 meters. What is the mechanical advantage of the pulley system?
a) 3
b) 2
c) 5
d) 4

In which part of a pendulum's swing is it moving the fastest?
a) Right when it is let go
b) Cannot be determined
c) At the bottom of its swing
d) At the top of its swing

Machines are capable of creating energy.
a) True
b)
c)
d) False

How can a pulley system's mechanical advantage be calculated simply?
a) count the number of pulleys
b) subtract the number of pulleys from the number of ropes
c) multiply the number of pulleys by the number of ropes
d) subtract the input force by the output force

In a perfect world, the total energy of a pendulum would never change.
a) True
b) False
c)
d)

"g" is equal to what number at Earth's surface?
a) 9.8
b) 10
c) 6.4
d) 3.9

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