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Science 8-2: Mechanical Systems Section 2.0 Quiz

Last updated about 2 months ago

28 Nsɛmmisa

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Using your notes, assigned work and videos answer the following mulitple choice questions.

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Asemmisa {{asɛmmisaAhyɛnsode}}

1.

Roads in the mountains have sections to help vehicles up a steep incline, by making sharp turns back and forth in opposite directions, after raising the vehicle a little higher in altitude. These roads are an example of a simple machine – the inclined plane, and are called ...

A reversals

B switchbacks

C zig zags

D turnabouts

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2.

Your car has a flat tire, but you don’t have a jack to lift it up, so you can change the tire. What machine could you make that would make it possible to lift the car ...

A lever

B wedge

C pulley

D ramp

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3.

Mechanical advantage is the amount by which a machine can multiply a force. The force that the machine applies to the object is called the ...

A input force

B output force

C force ratio

D Newton Force

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4.

To calculate the mechanical advantage or force ratio, you divide the output force by the input force. A machine that is able to move an object that weighs 36 Newtons with 6 Newtons of force has a mechanical advantage of ...

A 6

B 30

C 36

D 42

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5.

A pulley system can provide a mechanical advantage.
Look at the illustration and identify what the mechanical advantage of
this pulley system is.

A 2

B 3

C 4

D 5

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6.

If it takes 45 N of force to lift a 180 N carton using a pulley system, what would the pulley system look like ...

A

null

B

null

C

null

D

null

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7.

Speed Ratio is calculated by dividing the ...

A Output distance by the input distance

B Input distance by the output distance

C Output force by the input distance

D Input force by the output distance

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8.

To calculate the speed ratio of a pulley system, you count...

A all the ropes

B only the ropes supporting the load

C only the ropes applying force

D all the ropes that are movebale

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9.

In most machines, you don’t get something for nothing. When you gain a mechanical advantage, you are gaining ...

A force

B speed

C distance

D resistance

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10.

A bicycle is a useful machine because it gets us from place to place much faster than we could walk. As a machine it has a mechanical advantage of less than one, but what about speed ratio? The speed ratio of a bicycle is ...

A 1

B more than 1

C less than 1

D cannot be determined

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11.

What can account for the fact that mechanical advantage and speed ratio are different in real situations?

A improper calculations

B faulty equipment

C force of friction

D loss of energy

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12.

Efficiency is a measure of how well a machine does work. Dividing the mechanical advantage by the speed ratio and multiplying the result by 100 will determine the efficiency of the machine. A pulley system that has a speed ratio of 3 and a mechanical advantage of
2 has an efficiency of...

A 33%

B 67%

C 60%

D 30%

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13.

The scientific definition of work is ...
“Work is done when a force acts on an object to make the object move.”
Which statement below describes work being done.

A Hank worked very hard to get all his homework done.

B Doing math is hard work if you don’t like numbers.

C It was hard work for Sam to move the desk two meters.

D It was hard work trying to move the car, but it wouldn’t budge.

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14.

Work is calculated using the formula W = F x d. If you lift a box onto your desk that is 0.4 meters off the floor, using 50 Newtons of force, how much work are you doing?

A 20 Joules

B 125 Joules

C 50.4 Joules

D 49.6 Joules

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15.

In a car, what provides the force (energy source) that makes work (the car moving) possible?

A engine

B transmisson

C gasoline

D wheels

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16.

Using a machine does not mean that less work is done. This is because ...

A Work input is never equal to work output

B Work input is equal to work output

C Less force means less distance

D More force means more distance

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17.

When determining the efficiency of a certain machine, the students found that 1600J of work were needed to get 1200J of work from the machine. The efficiency of this machine was ...

A 2800 J

B 400 J

C 75%

D 25%

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18.

A hydraulic system is able to move heavy loads because it uses this under pressure ...

A air

B water

C liquid

D nitrogen

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19.

Hydraulic systems are used in many different applications. A hair stylist would use hydraulics in their shop to do this ...

A mix chemicals and dyes

B operate electric shears

C run the neon signs

D rasie and lower the chair

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20.

Pressure is the measure of the force applied to a specific area. The unit of measurement is named after Blaise Pascal who worked with fluids. The unit of measure is the ...

A blaise

B pascal

C kilogram

D cubic meter

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21.

Pascal’s Law states that pressure applied to an enclosed fluid is transmitted ...

A to the walls of the container which double the pressure

B equally in all directions throughout the fluid

C by the transfer force in the fluid

D to the opposite piston where it increases the force

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22.

Pascal’s law enables these types of systems to work very effectively – hydraulics, which use a liquid and pneumatics, which use ...

A air

B oil

C water

D grease

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23.

A common application of the hydraulic system is the
hydraulic jack, like the one shown here ...
The piston identified by # 1 is the ...

A syringe piston

B hoist piston

C output piston

D input piston

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24.

The mechanical advantage in a hydraulic system is provided by the ...

A small psiton

B large piston

C flexible connection

D pressure in the fluid

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25.

A good example of a hydraulic system at work inside the body is the ...

A Respiratory system

B Digestive system

C Circulatory system

D Excretory system

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26.

The hydraulic jack, like the one shown here, identifies the input force piston and the output force piston ...
F_in = 50N
F_out = 1500N
The mechanical advantage of this hydraulic jack is ...

A 30

B 300

C 1000

D 2000

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27.

If the area of the input piston, in the hydraulic lift shown in the question above, is 5cm², what would be the area of the output piston? Set up a ratio using this formula to solve for
A_large

A 10 cm²

B 30 cm²

C 150 cm²

D 300 cm²

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28.

The disadvantage of the hydraulic system is similar to the disadvantage of levers and pulleys. To increase the force on the output piston, the input piston has to ...

A have less friction

B create more pressure

C move a greater distance

D be attached to the load