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WorksheetsYear 8 - Energy
Total questions: 27
Worksheet time: 21mins
Name
Class
Date
1.
Calculate work: A 100 Newton force is applied to move a 15 kg object a distance of 5 meters?
a)
20 Joules
b)
75 Joules
c)
500 Joules
d)
1500 J
2.
A force exerted over a distance to move an object is ______________________.
a)
power
b)
work
c)
momentum
d)
Watt
3.
A 5000N block is lifted 10 m. How much work was done?
a)
50000 J
b)
5000 J
c)
500 J
d)
50 J
4.
A ______ is a simple machine.
a)
Lever arm
b)
Lever
c)
Fulcrum
d)
Load
5.
How does a single fixed pulley, like the one seen here, help you do work?
a)
changes the direction of the force
b)
increases the amount of applied force
c)
decreases the amount of applied force
d)
allows you to pull the rope a shorter distance
6.
A(n) _____________ is a device for measuring temperature.
a)
thermometer
b)
barometer
c)
anemometer
d)
psychrometer
7.
Why does a cup of water become colder when ice is added?
a)
Heat flows from the water to the ice
b)
Heat flows from the ice to the water
c)
Cold flows from the ice to the water
d)
Cold flows from the water to the ice
8.
What type of energy is transferred between a cold and warm block?
a)
thermal energy
b)
chemical energy
c)
electrical energy
d)
mechanical energy
9.
Temperature is the same thing as heat.
a)
TRUE
b)
FALSE
10.
The kind of heat transfer that travels through space in electromagnetic waves is ______________________.
a)
insulation.
b)
Radiation
c)
Conduction
d)
Convection
11.
In heat transfer, heat always flows from the _______________ substance to the _______________ substance.
a)
Hotter to colder
b)
Colder to hotter
c)
Hotter to hotter
d)
Colder to colder
12.
The type of heat transfer that happens through direct contact of molecules or particles with each other is ___________________.
a)
Convection
b)
Conduction
c)
Radiation
d)
insulation.
13.
___________________ is the type of heat transfer that occurs in fluids, such as warm air rising and cold air sinking; creating wind.
a)
Convection
b)
Conduction
c)
Radiation
d)
insulation.
14.
Which statement is true?
a)
The quicker a molecule moves, the colder it is.
b)
The slower a molecule moves, the warmer it is.
c)
The quicker a molecule moves, the warmer it is
d)
The movement on molecule don�t affect its temperature
15.
Two objects at different temperatures are in contact. Which of the following happens to their thermal energy?
a)
Their thermal energies remain the same.
b)
Thermal energy passes from the cooler object to the warmer object
c)
Thermal energy passes from the warmer object to the cooler object.
d)
Thermal energy passes back and forth equally between the two objects.
16.
Heat from warm sand at the beach moves through the atmosphere by what method of heat transfer?
a)
Convection
b)
Conduction
c)
Radiation
d)
insulation.
17.
Students in a science class performed an experiment with hot and cold water. They dyed the hot water red and the cold water blue. When the students layered the water, they noticed that the hot water rose to the top and the cold water sank. What was this demonstrating?
a)
Radiation
b)
Air Pressure
c)
Evaporation
d)
Density
18.
The handle of a metal spoon warms up when it is placed in a hot bowl of soup because of
a)
Convection
b)
Conduction
c)
Radiation
d)
insulation.
19.
Which of the following is NOT a conductor?
a)
oven mitt
b)
curling iron
c)
iron skillet
d)
copper pipe
20.
A large house being heated by heater warms a house when the air is circulating.
a)
Convection
b)
Conduction
c)
Radiation
d)
insulation.
21.
Which statement is true about radiation?
a)
Radiation is the transfer of heat through electromagnetic waves
b)
Radiation is the transfer of heat through direct contact.
c)
Radiation is more dangerous than conduction.
d)
Radiation is the transfer of heat through liquids and gases
22.
Which situation best represents convection?
a)
Heat from a campfire
b)
A hot air balloon taking off
c)
Touching a hot piece of metal
d)
Getting sunburned
23.
The handle of a frying pan is often coated in rubber because rubber provides...
a)
Heat insulation
b)
Heat conduction
c)
A low melting point
d)
A nonstick surface
24.
Which of the following is NOT an insulator?
a)
Wool
b)
Plastic
c)
Copper
d)
Styrofoam
25.
What insulation stops heat conducting through a surface of a building?
a)
Draught excluder
b)
Cavity wall insulation
c)
Loft insulation
d)
Central heating
26.
Which insulation cuts down on convection currents?
a)
Double Glazing
b)
Underlay
c)
Loft insulation
d)
Draught excluders
27.
How does a thermos reduce the flow of heat into and out of the bottle?
a)
bottle uses a vacuum and reflective surfaces
b)
bottle conducts electricity
c)
bottle explodes
d)
bottle radiates its shell to iceland
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