Mechanical Energy- Reading

Mechanical Energy- READING

How Do You Find an Object’s Mechanical Energy?

What do a falling basketball, a moving car, and a trophy on a shelf all have in common? They all have mechanical energy!  The form of energy associated with the motion, position, or shape of an object is called mechanical energy.

An object’s mechanical energy is a combination of its potential energy and its kinetic energy.  The basketball has both potential energy and kinetic energy.  The higher the basketball moves, the greater its potential energy.  The faster the basketball moves, the greater its kinetic energy.  You can find an object’s mechanical energy by adding together the object’s kinetic energy and potential energy.

Mechanical energy = potential energy + kinetic energy

​Mechanical Energy continued...

Sometimes an object's mechanical energy is its kinetic energy or potential energy only. A car moving along a flat road has kinetic energy only. A trophy resting on a shelf has potential energy only. But both have mechanical  energy.

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Multiple Choice

As mass decreased, kinetic energy ________________.

• increases

• stays the same

• decreases

• doubles

Multiple Choice

As mass decreased, kinetic energy ________________.

• increases

• stays the same

• decreases

• doubles

Multiple Choice

Moving a book to a lower shelf ____________ the potential energy.

• decreases

• increases

• triples

• doubles

Multiple Choice

A blimp circling above a sporting event will have what kind of energy?

• kinetic only

• kinetic and elastic potential

• potential only

• kinetic and gravitational potential

Multiple Choice

According to the law of conservation of energy, energy cannot be _____________________________________.

• destroyed.

• conserved.

• changed ever.

• created nor destroyed.

Multiple Choice

Work ____________ energy.

• creates

• transfers

• destroys

• subdues

Multiple Choice

Which equation is correct?

• Mechanical energy=kinetic energy-potential energy

• mechanical energy=potential energy -kinetic energy

• mechanical energy= kinetic energy + potential energy

• Mechancal energy= kinetic energy x potential energy

Multiple Choice

What variable would you change to increase the kinetic energy of the rolling marble?

• Increase the length of the ramp

• Increase the height of the ramp

• Decrease the length of the ramp

• Decrease the height of the ramp

Multiple Choice

According to the picture, how would the gravitational potential energy of the car change if its mass was doubled?

• The gravitational potential energy would be doubled

• The gravitational potential energy would stay the same

• The gravitational potential energy would be cut in half

• The gravitational potential energy would be increased by 750

Multiple Choice

Students are investigating changes from potential to kinetic energy by rolling a marble down a ramp made by propping up a plastic ruler on a book and letting it roll down.

Which of the following will change the potential energy the marble starts with?

• Adding more books beneath the ruler to increase its height

• Pushing the marble down the ramp

• Switching the plastic ruler with a wooden one

• Replacing the marble with a rock

Multiple Choice

The diagram below shows a swinging pendulum ball.

Which point represents the pendulum's greatest potential energy?

• 1

• 2

• 3

• 4

Multiple Choice

The diagram below shows a car on a roller coaster with four labeled locations.

Between what two locations does the car’s kinetic energy transform into potential energy?

• W and X

• W and Y

• X and Y

• Y and Z

Multiple Choice

Which passenger has the most potential energy?

• A

• B

• C

• D

Multiple Choice

Which cylinder has more kinetic energy?

• Hollow cylinder

• Solid cylinder

• Kinetic energy is the same

Multiple Choice

Which skier has more mechanical energy?

• Skier 1

• Skier 2

• Neither, they don't have any mechanical energy

• The mechanical energy is the same since they're not moving.

Multiple Choice

What is the transformation of mechanical energy in a ball when it is thrown straight up and then comes back down?

• Potential energy as the ball is thrown, kinetic as it is at the top, potential as it returns.

• Kinetic energy as the ball is thrown, potential as it is at the top, potential as it returns.

• Kinetic energy as the ball is thrown, potential as it is at the top, kinetic as it returns.

Multiple Choice

Is mechanical energy conserved as a playground swing moves?

• Yes

• No

Multiple Select

What are the two forms of energy that make up mechanical energy?

• Chemical

• Potential

• Kinetic

• Electrical

Multiple Choice

What can you determine about total energy from this graph?

• The pendulum loses mechanical energy

• Kinetic energy stays constant throughout the graph

• Total energy is conserved throughout the graph

• Potential energy stays constant throughout the graph

Multiple Choice

The energy associated with BOTH the motion and position of an object is

• A. Electrical Energy

• B. Mechanical Energy

• C. Light Energy

• D. Sound Energy