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9th_PH_5_3_I2_Pulleys, Conservation of Mechanical Energy, Power and Th
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Created on May 7, 2023
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Transcript
Pulleys, Conservation of Mechanical Energy, Power and Thermal Energy
PART II
start
1/10
1/10
How does the input force compare to the output force for a fixed pulley?
They are the same
The output force is greater
The output force is less
WELL DONE
1/10
next
2/10
2/10
In a moveable pulley, how is the object's weight distributed through the rope?
It depends on the weight of the object
Each side supports 1/2 of the weight
Each side supports 2x the weight
WELL DONE
2/10
NEXT
3/10
3/10
How is it possible to have less input force but more output force?
The input work is decreased
The input distance is increased
The input work is increased
WELL DONE
3/10
NEXT
4/10
4/10
What does a moveable pulley do that a fixed pulley does not?
Work
Magnifies the force
Lifts an object
WELL DONE
4/10
NEXT
5/10
5/10
What does the law of conservation of energy state?
Energy can be neither created nor destroyed
Energy cannot change forms
Energy can be created but not destroyed
WELL DONE
5/10
NEXT
6/10
6/10
What is heat?
The creation of thermal energy in an object or system.
The destruction of thermal energy in an object or system.
The transfer of thermal energy from one object or system to another.
WELL DONE
6/10
NEXT
7/10
7/10
Which of the following is the best definition of renewable energy?
Any form of energy that can be recycled.
Energy from the movement of an object.
Energy from a natural resource that can be replenished.
WELL DONE
7/10
NEXT
8/10
8/10
Most of the Earth's geothermal energy is contained within:
The Earth's core.
The Earth's deserts.
The Earth's crust.
8/10
8/10
NEXT
9/11
9/11
What would happen if geothermal energy ceased to exist?
The surface of the Earth would heat up
The surface of the Earth would cool
The surface of the Earth would break apart
9/11
9/11
NEXT
10/11
10/11
Energy can best be defined as:
The movement of particles within a system
The ability to do work
The temperature of a substance
10/11
10/11
NEXT
11/11
11/11
What makes thermal energy possible?
The movement of particles
Chemical bonds
The number of particles in a system.
EXCELLENT JOB!
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