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Science 8 Unit D Mechanical Systems

Total questions: 50

Worksheet time: 40mins

Name
Class
Date
1.

This formula calculates the amount of work done by a simple machine

a)

W=J/d

b)

W= F/d

c)

W= J x d

d)

W= F x d

2.

What is the formula for Mechanical Advantage?

a)

MA=InF/OutF

b)

MA=Outd/Ind

c)

MA=OutF/InF

d)

MA=Ind/Outd

3.

How do you calculate speed ratio

a)

SR=Ind/Outd

b)

SR=Outd/Ind

c)

SR=InF/OutF

d)

SR=OutF/Inf

4.

What is the correct unit for Pressure?

a)

Speed Ratio (SR)

b)

Mechanical Advantage (MA)

c)

Joules (J)

d)

Pascals (Pa)

5.

What unit is efficiency measured in?

a)

Pascals (Pa)

b)

Joules (J)

c)

Percent (%)

d)

Newtons (N)

6.

Work is calculated in this.

a)

Joules (J)

b)

Pascals (Pa)

c)

Percent (%)

d)

Newtons (N)

7.

These units are used in Mechanical Advantage

a)

Meters (m)

b)

Newtons (N)

c)

The units cancel out

d)

Joules (J)

8.

This class of lever has the load in the center

a)

1st class

b)

2nd class

c)

3rd class

d)

4th class

9.

Scissors are an example of this class of lever

a)

1st class

b)

2nd class

c)

3rd class

d)

4th class

10.

What is a first class lever?

a)

load in the middle

b)

effort in the middle

c)

friction in the middle

d)

fulcrum in the middle

11.

If a force of 100N is applied to lever and this moved a load 5m, this is the amount of work done

a)

20J

b)

500J

c)

0.05J

d)

105J

12.

This length of lever requires less effort/force to be used.

a)

longer lever

b)

shorter lever

13.

What does a reducing gear system look like?

a)

driving gear is larger than the driven gear

b)

driving gear is the same size as the driven gear

c)

driving gear does not exist

d)

driving gear is smaller than the driven gear

14.

This Law states: Pressure exerted on a contained fluid is transmitted undiminished in all directions in the fluid and perpendicular to the walls of the container

a)

Work Law

b)

Joules's Law

c)

Pascal's Law

d)

Miss Shankowski's Law

15.

How could you reduce the amount of pressure that you exert on the ground while walking across snow?

a)

Decrease your surface area

b)

Increase your surface area

c)

Nothing

d)

Jump instead of walk

16.

This formula helps compare the Pressure in a hydraulic jack’s input and output pistons.

a)

A1/A1=A2/A2

b)

F1/A1=F2/A2

c)

A1/F1=F2/A2

d)

A1/F1=A2/F2

17.

When doing work, this type of slanted surface reduces the force you need to exert on something.

a)

screw

b)

pulley

c)

inclined plane

d)

wedge

18.

This is the “Work Output by a machine divided by the Work Input x 100%

a)

efficiency

b)

work

c)

pressure

d)

hydraulic press

19.

Example where friction is useful

a)

when polishing a car

b)

on a curling rink

c)

to make a sled move faster

d)

brakes on a bike

20.

Linkages are used for this in machines

a)

transfer energy

b)

transfer heat

c)

transfer people

d)

transfer gears

21.

____________________ is a force that opposes motion.

a)

Angle

b)

Twisting

c)

Friction

d)

Speed

22.

Each subsystem in a complex machine contains a simple machine and usually has just one function. List 2 examples of a subsystem on a pedal bike.

4 lines
23.

A system is a group of parts that work together to perform a function.

a)

True

b)

False

24.

Machines support many humans needs. Provide an example of a human need from the past that was met by a machine.

4 lines
25.
A wheelbarrow is an example of
a)
First Class Lever
b)
Second Class Lever
c)
Third Class Lever
d)
Fourth Class Lever
26.
Which of the following does a simple machine NOT do?
a)
Increase the force applied
b)
Increase the distance the force is applied over
c)
Change the direction the force is applied
d)
Change the amount of work that needs to be done
27.
A simple machine used to push two objects apart.
a)
Lever
b)
Inclined Plane
c)
Wedge
d)
Screw
28.
If the fulcrum is closer to the effort, it will take 
a)
more force to lift the load
b)
less force to lift the load
c)
equal force to the lift the load
d)
no force to life the load 
29.
What is a disadvantage of using an inclined plane to lift a heavy object?
a)
The object must be moved a greater distance.
b)
It takes less effort to move the object.
c)
Many objects are difficult to lift straight up.
d)
Heavy object usually take up more space.
30.
What is a disadvantage of using an inclined plane to lift a heavy object?
a)
The object must be moved a greater distance.
b)
It takes less effort to move the object.
c)
Many objects are difficult to lift straight up.
d)
Heavy object usually take up more space.
31.
If the small gear is driving the large gear, the gear system is ...
a)
reducing
b)
multiplying
c)
both reducing and multiplying
d)
Not enough information
32.
When a driving gear is smaller than the driven gear the result is....
a)
multiplying
b)
reducing
c)
same direction
d)
faster speed
33.
A SERIES OF GEARS CONNECTED TOGETHER IS CALLED ...
a)
WAGON
b)
TRAIN
c)
SHIP
d)
COMBINATION
34.

The sakia meets the human need for:

a)

food

b)

water

c)

oxygen

d)

suitable living conditions

35.
How much work is produced when 350 N is used to move a car 5 m?
a)
70 J
b)
1750 J
c)
355 J
d)
175 J
36.
The mechanical advantage of this inclined plane is.....
a)
2.4
b)
3.4
c)
4.4
37.
A 16 N force is applied to an object and 96 J of work is done. How far was the object moved?
a)
6 m
b)
16 m 
c)
80 m 
d)
1536 m 
38.
What is the efficiency of a machine if 55.3 J of work are done on the machine, but only 14.3 J is produced by the machine?
a)
0.25 J
b)
26%
c)
386%
d)
3.86 J
39.
What is the efficiency of the machine if the work input is 263 J and the work output is 142 J? 
a)
6.26%
b)
54%
c)
100%
d)
260%
40.
if a load of a lever is 100 newtons and the force you apply is 20 newtons, what is your mechanical advantage?
a)
120 N
b)
5 N
c)
2000 N
d)
80 N
41.
If 68 Joules were necessary to move a 4 Newton crate, how far was the crate moved?
a)
272 m
b)
17 m
c)
4.05 m
d)
272 cm 
42.
A person applies a force to a wall. 
a)
  Work is done because the person uses energy when applying the force  
b)
Work is done because the wall heats up at the place where the force is applied  
c)
No work is done
43.
The rule that when force is applied to a confined fluid, the increase in pressure is transmitted equally throughout.
a)
pascal's principle
b)
bernoulli's principle
c)
archimedes' principle
d)
Newton's Law
44.
If you push a lever 0.8m with a force of 12N, and a 30N baby alligator is lifted 0.2m, what is the efficiency of the lever system?
a)
12%
b)
16%
c)
30%
d)
63%
45.
If a wheel and axle is turned 1.6m a baby dragon is lifted 0.3m, what is the speed ratio of the pulley system?
a)
0.3
b)
0.48
c)
1.6
d)
5.3
46.
To have a mechanical advantage, the load would be placed on which piston?
a)
Piston A
b)
Piston B
47.
What pressure does a 4000N horse exert on the ground if each foot is 10cm2?
a)
40 N/cm2
b)
100 N/cm2
c)
400 N/cm2
d)
10 N/cm2
48.

Building larger and faster planes has been a result of

a)

changes to the environment

b)

changes in technology

c)

changes in society

d)

all of the above

49.

One of the problems with the removable tab top in the evolution of the can opener was that

a)

it was hard for most people to open

b)

it was difficult to manufacture pop can with a tab

c)

it created problems for the beverage maker

d)

it created an environmental problem

50.

When evaluating a new product, you need to consider the design. The design is

a)

the physical form of the device that makes it usable

b)

what the device is supposed to do

c)

efficiency and effectiveness of the device

d)

how the device affects the environment

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