Font size
WorksheetsGrade 8 Physics chapter 4
Total questions: 25
Worksheet time: 19mins
Which of the given pictures shows that work can not done?
What are the factors affect gravitational potential energy?
Mass and Velocity
Mass, Acceleration due to gravity, and Height
Mass, Acceleration due to gravity and Time
A kilojoule is 1000 Joules
True
False
No, it's a kilogram of Joules
No, it's James Joules' fault
Food has _________ energy.
Chemical
Kinetic
None of the these
Elastic potential energy
SI unit of force (a)
When does an object have no kinetic energy?
When it's at rest.
When it's moving very slowly.
When the only force that's acting on it is gravity.
When it has no electrical charge.
Energy stored because of gravity is called:
Gravitational Potential Energy
Kinetic Energy
Mechanical Advantage
Chemical Energy
When a roller coaster is at the top of a hill it has
high potential energy
high kinetic energy
low potential energy
equal amounts of kinetic and potential energy
Conservation of energy means that
energy can be created but not destroyed
energy can be destroyed but not created
energy can both be created and destroyed
energy can neither be created nor destroyed
I released a balloon that was full of air and it is flying around the room, the balloon has
kinetic energy
potential energy
What type of energy transformation occurs when using an electric pencil sharpener?
electrical to mechanical
sound to electrical
mechanical to electrical
potential to sound
A lamp begins with electrical energy when plugged in and turns into _________ energy when the light comes on.
mechanical
kinetic
radiant
sound
What type of energy transformation happens in hydro-electric power?
kinetic to potential
sound to mechanical
chemical to electrical
mechanical to electrical
Which object shows an energy transformation from electrical to mechanical?
Electric power is expressed in
watts
time
kilo
meter
What are the factors that can affect the power?
Work done and time
Work done and velocity
Work done and force
What will be the formula if we are finding the TIME using the formula of power?
Time = powerwork done
Time = work donepower
Time = work x power
