WorksheetsY9 - UNIT2 - revision
Total questions: 42
Worksheet time: 29mins
Which of the following correctly identifies a method of heat transfer that will happen in this situation?
Heat will be transferred from the hot plate to the thermometer through radiation.
Heat will be transferred from the beaker to the thermometer through convection.
Heat will be transferred from the hot plate to the beaker through convection.
Heat will be transferred from the thermometer to the beaker through conduction.
Radiation is a method of thermal energy transfer. It refers to the transfer of heat energy that moves–
through empty space.
when objects touch.
only through solids.
in the motion of fluids.
Conduction can only occur between two objects when–
one object is less dense than the other.
both objects are in physical contact with each other.
one of the objects is made of a metal.
both objects are exactly the same temperature.
Thermal energy is transferred when two objects of different temperatures touch.
Conductors
Conduction
Radiation
Convection
Objects that can transfer energy easily.
Conductors
Conduction
Convection
Insulators
Transfer of energy through circular motion caused by heating and cooling in fluids (liquids and gases).
Conduction
Convection
Radiation
Conductors
Feeling warmth on your hands when you hold them near a campfire is an example of ____________________________.
radiation
conduction
convection
conductors
When ice cubes melt in a glass of water, a current forms in which heat moves from particles with more heat to particles with __________________ heat.
more
equal
less
If you place a ball on the top of a hill and it rolls down ____________ energy is converted to ____________ energy.
Kinetic / Potential
Potential / Kinetic
Mechanical / Heat
Light / Sound
What is the definition of energy?
The number of calories in a food item.
Kinetic energy is moving energy.
Potential energy is stored energy.
The ability to do work.
What kind of energy does a marble at the top of a hill have?
gravitational potential
chemical potential
kinetic
thermal
What is the correct unit for energy?
meters (m)
kilogram meters per second (kg m/s)
Newtons (N)
Joules (J)
What kind of energy does a marble rolling at the bottom of the hill have?
gravitational potential
chemical potential
kinetic
thermal
What does conservation of energy mean?
Total energy increases
Total energy decreases
Total energy stays the same
Calculate Elastic energy in a spring compressed 0.25m, when the spring's spring constant is 350N/m.
21.8 J
50 J
87.5 J
10.9 J
A drawn bow possesses mechanical energy in the form of _______________. After the arrow is released, the energy is transformed into _________________.
potential energy; mechanical energy
elastic potential energy; kinetic energy
gravitational potential energy; kinetic energy
elastic kinetic energy; mechanical kinetic energy
Which position shows the spring with least amount of energy elastic?
A
B
C
D
What is the spring constant for the system shown above?
0.1 N
10 N
200 N/m
50 N/m
A boy carries a 0.050kg box up a flight of stairs 0.010-km high. How much potential energy has the box gained?
0.0049J
49J
4900J
4.9J
At the top of a ramp, a toy car (at rest) has an Eg of 86 J. At the bottom of the ramp (height = 0 m), the car has an Ek of 50 J. How much energy was lost to thermal?
136J
36J
50J
5J
Heat energy is also called ______ energy.
chemical
electrical
mechanical
thermal
A kettle uses 100J of electrical energy to produce 7J of sound energy and 93J of thermal energy. How efficient is the kettle?
100%
7%
93%
95%
What happens when the ball goes from the highest position to the lowest position
PE and KE increases and decreases together
Impossible to know without knowing the mass of the object
the PE decreases while KE increases
Efficiency is calculated by Energy Out divided by Energy In, expressed as a percentage
False
True
