Levers And Pulleys Test Review Question Preview (ID: 42436)

Which kind of pulley system does NOT give you a mechanical advantage?
a) single moveable
b) single fixed
c) single fixed, single moveable effort down
d) single fixed, single moveable effort up

A load is pulling with a force of 100 Newtons. How many ropes does my pulley system need to have supporting the load if I want to reduce my effort to 20 N.
a) 2 ropes
b) 5 ropes
c) 10 ropes
d) 4 ropes

A load weighs 20 N and there are 4 pulley ropes supporting the load. How much effort will it take to lift the load?
a) 2 Newtons of effort
b) 3 Newtons of effort
c) 5 Newtons of effort
d) 10 Newtons of effort

If a pulley system has 6 ropes supporting the load, how much effort is needed to lift the load?
a) 1/6
b) 1/3
c) 1/4
d) 1/8

If a pulley system has 4 ropes supporting it, how much effort is needed to lift the load?
a) 1/3
b) 1/4
c) 1/2
d) 1/8

You can predict the effort needed to lift a load by knowing the weight of the load AND...
a) the number of pulley wheels in the system.
b) effort is pulled down
c) the number of ropes that support the load.
d) the number of ropes touching just the fixed wheel.

As effort decreases with a pulley, the length the rope must be pulled increases.
a) true
b) false
c)
d)

The greater the number of ropes supporting the load, the less effort needed to lift the load.
a) true
b) false
c)
d)

Reduces the effort needed to lift a load or overcome resistance.
c) effort
d) newton

A change in direction that results from passing a rope through a pulley
c) effort
d) newton

On a spring scale, what do the dark , longer lines represent?
a) 5 N
b) 10 N
c) 2 N
d) 1 N

A fixed pulley is being used to lift a load of 5N. How many Newtons of effort will be needed?
a) 10N
b) 5N
c) 2.5N
d) 1N

A class ___ lever has the fulcrum in the middle.
a) 1
b) 2
c) 3
d) 4

A broom is an example of a class ___ lever.
a) 1
b) 2
c) 3
d)

To make a load easier to lift, I should move my effort farther from the fulcrum.
a) true
b) false
c)
d)

How can you adjust the load on a lever to make the effort less?
a) move it closer to the fulcrum
b) move it farther away from the fulcrum
c) move it on top of the effort
d)

A wrench is an example of a class ____ lever.
a) 1
b) 2
c) 3
d)

A hammer can represent two different lever classes depending on how you use it.
a) true
b) false
c)
d)

Which of these pairs of levers belongs to the same class?
a) can opener and tweezers
b) a see-saw(teeter totter) and a tennis racket
c) nutcraker and broom
d) scissors and a shovel

What do the smaller lines on a spring scale represent?
a) ones
b) tenths
c) hundredths
d)

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