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Grade 8 Finals

Total questions: 110

Worksheet time: 1hrs 9mins

Name
Class
Date
1.
What is the value of g on Earth?
a)
9.81 m/s^2
b)
9.81 N
c)
9.81 m
d)
9.81 s/m^2
2.
All objects in the universe have a gravitational attraction to each other. 
a)
True
b)
False
3.
When plants convert the sun's energy into food, which type of energy is it?
a)
kinetic
b)
chemical
c)
thermal
d)
radiant
4.
A Newton is a derived unit of force that is actually... (Think of the units involved in Newton's second law of motion) 
a)
Kg m/s2
b)
Kg m/s
c)
Kg 
d)
Kg m2/s2 
5.
Both of these are measured in Newtons
a)
Force and acceleration
b)
Force and weight
c)
Mass and weight
d)
Mass and acceleration
6.
What is the SI unit used to measure weight?
a)
Grams 
b)
Liters
c)
Pounds 
d)
Newtons 
7.
Free-falling objects on Earth in a vacuum fall at a rate of...
a)
98 m/s
b)
9.8 mm/s
c)
9.8 m/s/s
d)
9..8 m/s
8.
What type of force is shown in the picture above?
a)
Magnetic
b)
Gravitational
c)
Applied
d)
Normal
9.
What force ultimately slows the roller coaster to a stop?
a)
Applied
b)
Normal
c)
Friction
d)
Magnetic
10.
Which of the following is a unit of energy?
a)
Kilowatts
b)
Grams
c)
Meters per Second
d)
Joules
11.
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
12.
A Joule, a unit of energy, is also known as ... (think of the equation for work)
a)
a unit of force.
b)
a Newton meter
c)
a m/s2
d)
a m/s
13.
The acceleration due to Earth's gravity is ...
a)
9.8 m/s2
b)
29.4 m/s2
c)
1.6 m/s2
d)
32 m/s2
14.
When the speed of an object is doubled, its momentum
a)
remains unchanged in accord with the conservation of momentum.
b)
doubles
c)
quadruples
d)
decreases
15.
What is the unit for momentum?
a)
m/sec
b)
kg/sec
c)
kg/m
d)
kg m/sec
16.
A 0.250 kg cart moving at 0.400 m/s has how much momentum?
a)
0.1 kg-m/s
b)
1 kg-m/s
c)
10 kg-m/s
d)
100 kg-m/s
17.
What is the unit for mass?
a)
m/sec
b)
kg/sec
c)
kg
d)
kg m/sec
18.

The momentum of an object depends upon the object's ___________&_____________.

a)

size and shape

b)

mass and speed

c)

mass and veloctiy

d)

mass and energy

19.

When you exert a force on an object you are doing...

a)

nothing

b)

work

c)

drag

d)

lift

20.

Work =

a)

force x distance

b)

mass x acceleration

c)

velocity x mass

d)

force x velocity

21.

Power =

a)

worktime\frac{work}{time}

b)

Distan⁡cetime\frac{Dis\tan ce}{time}

c)

Timework\frac{Time}{work}

d)

timedistan⁡ce\frac{time}{dis\tan ce}

22.

The force exerted on a machine.

a)

Input

b)

output

23.

The force exerted by the machine

a)

input

b)

output

24.

Output ForceInput Force\frac{Output\ Force}{Input\ Force}  is....

a)

Mechanical Advantage

b)

Physiological Advantage

c)

Physical Advantage

d)

Efficiency Advantage

25.

Output ForceInput Force × 100 %\frac{Output\ Force}{Input\ Force}\ \times\ 100\ \%  is....

a)

Mechanical 

b)

Physiological 

c)

Physical 

d)

Efficiency 

26.

What are the six basic kinds of simple machines?

4 lines
27.

What simple machine is in this picture?

(a)  

28.

What simple machine is in this picture?

(a)  

29.

How many classes of levers are there?

a)

2

b)

3

c)

4

d)

5

30.

A machine that utilizes two or more simple machines.

a)

bilateral machine

b)

compound machine

c)

multiple machine

d)

versatile machine

31.

What is the difference between a lever and a fulcrum?

4 lines
32.

Most of the machines in the human body are...

(a)  

33.

Energy is

a)

Whether one feels like doing work

b)

the ability to do work

c)

calculated by dividing the amount of work by the amount of time to do the work

d)

just another word for work

34.

Which form of energy is almost always produced during energy transformations?

a)

Heat

b)

Electricity

c)

Light

d)

Sound

35.

As a rubber band is snapping back, it has what kind of energy?

a)

Potential

b)

Kinetic

c)

None

d)

Position

36.

Which two energy sources together provide more than 50% of the energy needs in the US?

a)

nuclear and natural gas

b)

oil and coal

c)

hydro power and oil

d)

natural gas and oil

37.

Which energy source is renewable?

a)

Fuel oil

b)

Natural Gas

c)

WInd

d)

Coal

38.

Energy of motion is called

a)

elastic potential energy

b)

kinetic energy

c)

gravitational potential energy

d)

chemical energy

39.

Which factor contributes to global warming?

a)

increased use of solar-powered cars

b)

increased burning of fossil fuels

c)

better long-term weather forecasts

d)

changing distance between Earth and Sun

40.

The Law of Conservation of Energy states that energy cannot be created or destroyed, but energy can change

a)

its total mass

b)

its total volume

c)

from one form to another

d)

from one state of matter to another

41.

Which form of energy is being converted to electrical energy by the batteries in a flashlight?

a)

Chemical

b)

Nuclear

c)

Solar

d)

Sound

42.

Which form of energy is produced when a rubber band vibrates?

a)

chemical

b)

light

c)

electrical

d)

sound

43.

The unit for power is

a)

Calorie

b)

Work

c)

Watt

d)

Power

44.

Which changes in energy are illustrated in the diagram?

a)

electrical to sound to light and mechanical

b)

sound to mechanical to light and electrical

c)

mechanical to light to sound and electrical

d)

light to electrical to mechanical and sound

45.

Which type of electromagnetic energy has a shorter wavelength than ultraviolet?

a)

Visible Light

b)

X rays

c)

Microwaves

d)

Infrared

46.

The bulb above is not lit when the switch is in this position because...

a)

Current is flowing

b)

The wire is connected

c)

The circuit is not complete

d)

The Circuit is complete

47.

As a candle burns, the chemical energy stored in the wax is transferred into

a)

Heat and Light

b)

Heat and Magnetism

c)

Electricity and Light

d)

Electricity and Magnetism

48.

Energy is

a)

Whether one feels like doing work

b)

the ability to do work

c)

calculated by dividing the amount of work by the amount of time to do the work

d)

just another word for work

49.

Which form of energy is almost always produced during energy transformations?

a)

Heat

b)

Electricity

c)

Light

d)

Sound

50.

As a rubber band is snapping back, it has what kind of energy?

a)

Potential

b)

Kinetic

c)

None

d)

Position

51.

Which two energy sources together provide more than 50% of the energy needs in the US?

a)

nuclear and natural gas

b)

oil and coal

c)

hydro power and oil

d)

natural gas and oil

52.

Which energy source is renewable?

a)

Fuel oil

b)

Natural Gas

c)

WInd

d)

Coal

53.

Energy of motion is called

a)

elastic potential energy

b)

kinetic energy

c)

gravitational potential energy

d)

chemical energy

54.

Which factor contributes to global warming?

a)

increased use of solar-powered cars

b)

increased burning of fossil fuels

c)

better long-term weather forecasts

d)

changing distance between Earth and Sun

55.

The Law of Conservation of Energy states that energy cannot be created or destroyed, but energy can change

a)

its total mass

b)

its total volume

c)

from one form to another

d)

from one state of matter to another

56.

Which form of energy is being converted to electrical energy by the batteries in a flashlight?

a)

Chemical

b)

Nuclear

c)

Solar

d)

Sound

57.

Which form of energy is produced when a rubber band vibrates?

a)

chemical

b)

light

c)

electrical

d)

sound

58.

The unit for power is

a)

Calorie

b)

Work

c)

Watt

d)

Power

59.

Which changes in energy are illustrated in the diagram?

a)

electrical to sound to light and mechanical

b)

sound to mechanical to light and electrical

c)

mechanical to light to sound and electrical

d)

light to electrical to mechanical and sound

60.

Which type of electromagnetic energy has a shorter wavelength than ultraviolet?

a)

Visible Light

b)

X rays

c)

Microwaves

d)

Infrared

61.

The bulb above is not lit when the switch is in this position because...

a)

Current is flowing

b)

The wire is connected

c)

The circuit is not complete

d)

The Circuit is complete

62.

As a candle burns, the chemical energy stored in the wax is transferred into

a)

Heat and Light

b)

Heat and Magnetism

c)

Electricity and Light

d)

Electricity and Magnetism

63.

The region in which a magnetic force acts is called a

a)

line of force

b)

pole

c)

magnetic field

d)

field of attractio

64.

An example of a ferromagnetic material is

a)

copper

b)

wood

c)

cheese

d)

nickel

65.

A coiled current carrying wire is called

a)

an electromagnet

b)

a solenoid

c)

a compass

d)

a ferromagnet

66.

Unlike poles of different magnets

a)

attract each other

b)

cancel each other out

c)

repel each other

67.

Electromagnets can be

a)

turned on and off

b)

made stronger

c)

made from iron

d)

made weaker

68.

The magnetosphere

a)

surrounds the Earth

b)

Surrounds the sun

c)

is shaped by the solar wind (charged particles from the sun)

d)

doesn't exist

69.

The magnetic field is strongest

a)

at the poles

b)

in the middle

c)

at the north pole

d)

at the south pole

70.

THe north end of a compass needle always points to

a)

our geographic north pole

b)

our geographic south pole

c)

our magnetic north pole

d)

our magnetic south pole

71.

Earth acts like a magnet because its core contains

a)

molton carbon

b)

solid nickel and iron

c)

rocks

d)

molten nickel and iron

72.

Which of the following would be an example of an insulator?

a)

iron

b)

aluminum

c)

rubber

d)

silver

73.

The rule of charged particles states that

a)

opposites attract

b)

opposites repel

c)

opposites don't interact

d)

likes attract

74.

These are responsible for the flow of electricity

a)

protons

b)

electrons

c)

neutrons

d)

wires

75.

Conduction is the transfer of electric charges by

a)

interaction of electric fields

b)

direct contact

c)

rubbing

d)

jumping

76.

If the magnets above were brought close together they would…

a)

attract each other with a a strong force

b)

repel each other with a strong force

c)

attract each other with a weak force

d)

repel each other with a weak force

77.

An example of static discharge would be

a)

using a compass

b)

an elecromagnet

c)

a lightning bolt

d)

rain

78.

Which position of the two magnets results in the greatest attraction between them?

a)

A

b)

B

c)

C

d)

D

79.

Current is the flow of these through a wire

a)

electrons

b)

protons

c)

neutrons

80.

Charging by rubbing is called

a)

friction

b)

induction

c)

conduction

d)

polarization

81.

Current, or the flow of charge through a wire is measured in

a)

volts

b)

amps

c)

Joules

d)

Newtons

82.

Induction is the charging of an object through

a)

direct contact

b)

rubbing

c)

interaction of electric fields

d)

pugging it in

83.
The smallest part of an element...
a)
atom
b)
molecule
c)
electron
84.
____________ can join to form molecules.
a)
atom
b)
molecule
c)
electron
85.
The smallest part of an element...
a)
atom
b)
molecule
c)
electron
86.
____________ can join to form molecules.
a)
atom
b)
molecule
c)
electron
87.
Type of matter made of two or more elements...
a)
element
b)
mixture
c)
compound
88.
Substance with NO definite volume or shape...
a)
solid
b)
liquid
c)
gas
89.
Substance with a DEFINITE shape and DEFINITE volume...
a)
solid
b)
liquid
c)
gas
90.
Substance that fills its container and can "spill" out into more space...
a)
solid
b)
liquid
c)
gas
91.
Anything that takes up space and has mass...
a)
Electron
b)
Atom
c)
Matter
92.
Different materials placed together, but each keeps its own properties...
a)
Solution
b)
Mixture
93.
Lucky Charms and milk is an example of a...
a)
Mixture
b)
Solution
94.
Different materials placed together that spread out evenly and do not settle...
a)
Mixture
b)
Solution
95.
Lemonade is an example of a...
a)
Mixture
b)
Solution
96.
The smallest particle of a compound that still has the compound characteristics...
a)
Atom
b)
Molecule
97.
True or False: Ice cubes and water have particles that ACT/MOVE the exact same way.
a)
True
b)
False
98.
True or False: Ice cubes and water are made up of the same atoms (hydrogen and oxygen). 
a)
True
b)
False
99.
The particles in a solid are...
a)
vibrating and closely packed together
b)
vibrating and loosely packed together
c)
not moving at all
100.
Material that allows electric current or heat energy to flow through easily is...
a)
solubility
b)
conductor
c)
relative density
d)
magnetism
101.
The property of attraction to a magnet
a)
Solubility
b)
Mass
c)
Insulator
d)
Magnetism
102.
Measurement of the ability of a solid to dissolve in a liquid
a)
Relative Density
b)
Physical State
c)
Melting
d)
Solubility
103.
What is an example of a physical property?
a)
reactivity
b)
 color
104.
Is melting butter for popcorn a chemical or physical change?
a)
chemical
b)
physical
105.
Is spoiling food a physical or chemical change?
a)
phyiscal
b)
chemical
106.
How would you classify the color of a rose?
a)
chemical change
b)
physical property
c)
physical change
d)
chemical property
107.
Exothermic reactions...
a)
Absorb energy
b)
Release energy
c)
Release Color
d)
Absorb Color
108.
What type of reaction occurs in a hand warmer
a)
exothermic
b)
endothermic
109.
What is a solute?
a)
The substance that does the dissolving in a solution.
b)
The substance that is dissolved into the solution.
c)
The mixing of different substances.
d)
The process in which neutral molecules lose or gain electrons
110.
What is a solvent?
a)
The substance that does the dissolving in a solution.
b)
The substance that is being dissolved in a solution.
c)
The mixing of different substances.
d)
The process in which neutral molecules lose or gain electrons

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