Mechanical Energy Question Preview (ID: 33371)
Exploring KE PE.
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At what position does a roller coaster have the greatest potential energy?
a) At the top of the hill
b) Halfway down the hill
c) Towards the bottom of the hill
d) At the top of a smaller hill
Another word for kinetic energy could be _______ energy.
a) Safe
b) Moving
c) Stored
d) Potential
Mechanical energy is defined as the sum of both the potential energy and the kinetic energy of an object. According to the law of conservation of energy, what happens to mechanical energy if the potential energy of an object decreases?
a) Mechanical energy decrease.
b) Mechanical energy increases.
c) Mechanical energy remains unchanged.
d) Mechanical energy increases and then decreases.
Energy can be transformed from one type to another. In which of the following situations is kinetic energy transformed into potential energy?
a) When a boulder rolls down a mountain
b) When a water tank ruptures and water flows out
c) When a tree branch falls towards the ground
d) When a ball is thrown straight up into the air.
As the cars of a rollercoaster race down a hill, energy transformations take place. Which of the following is true?
a) Some potential energy is transformed to kinetic energy and other forms of energy.
b) Some energy is destroyed as the car slows down.
c) The kinetic energy of the cars is equal to the potential energy of the cars.
d) Kinetic energy is stored in the cars as they move downhill.
The law of conservation of energy describes a key characteristic of energy and the way it is transformed within systems. Which expression best demonstrates the law of conservation of energy?
a) gravitational potential energy = weight x height
b) density = mass/volume
c) momentum = force x time
d) mechanical energy = potential energy + kinetic energy
Carlo was helping make dinner, so he placed a pot of cold water on the stove and started to heat it up. As the water got warmer, the water particles gradually moved faster. Which statement could Carlo correctly make about the water in the pot?
a) The water particles in the cold water did not have any potential energy.
b) The water particles illustrated kinetic energy changing into potential energy.
c) The kinetic energy of the water particles increased as the water got hotter.
d) The kinetic energy of the water particles did not change as the water heated.
What happens when an object is moved against gravity, such as rolling a toy car up a ramp?
a) Kinetic energy does not change.
b) Potential energy does not change.
c) Potential energy decreases as it is transformed into kinetic energy.
d) Kinetic energy is transformed into potential energy.
A high-speed collision between two vehicles causes more damage than a low-speed collision. What is the reason for this?
a) Vehicles traveling at a high speed have no potential energy.
b) Vehicles traveling at a low speed have no potential energy.
c) Vehicles traveling at a high speed have more kinetic energy than vehicles traveling at lower speeds.
d) Vehicles traveling at a low speed have more kinetic energy than vehicles traveling at higher speeds.
How does potential energy transfer to kinetic energy?
a) when an object cools down
b) when an object remains at rest and charges up
c) When an outside force acts upon an object causing it to move.
d) Potential Energy cannot become Kinetic Energy
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