KE and PE Transformations

Malcolm's class has been assigned a project in which it is to build a four-wheeled vehicle to transport a soda can across the classroom. The car will be powered by stretching rubber bands around an axle before releasing the vehicle on the floor.

The vehicle will be powered by transforming _______ energy into _______ energy.

• mechanical; thermal

• thermal; mechanical

• elastic potential; kinetic

• kinetic; elastic potential

Tags

NGSS.MS-PS3-1

Devon is playing with a yo-yo. A yo-yo has an axle in the middle of two plastic halves. A string is tied around this axle. As Devon moves his hand, the yo-yo goes up and down. The yo-yo converts potential energy to kinetic energy as it moves.

Which of the following pictures represents the yo-yo with the most potential energy?

• 
• 
• 
• 

Tags

NGSS.MS-PS3-2

Mr. Draper asks his class to design a system of gears, strings, and pulleys that will allow him to pull back the classroom's curtains simply by turning a crank at his desk.

The system must be built within the following constraints:

*It must be made only out of metal gears, metal pulleys, string, and one crank.

*It must be strong enough to move the curtains.

*It cannot be in the way of students or their desks.

*It must take no more than one day to build.

The final design will use which type of energy to perform work on the curtains?

• kinetic energy

• gravitational potential energy

• thermal energy

• elastic potential energy

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Robin is swinging back and forth from a trapeze.

In which of the following situations is his kinetic energy being transformed into potential energy?

• when his speed is increasing and his height is decreasing

• when his height is not changing and his speed is zero

• when his height is increasing and his speed is decreasing

• when his height and speed are both equal to zero

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which of the following is an example of work being done on an object?

• A wagon is used to carry vegetables from a garden.

• A pulley is used to get water from a well.

• A hammer is used to remove a nail from a wall.

• all of these

Tags

NGSS.MS-PS3-5

Which of the following situations describes an object's kinetic energy being converted into gravitational potential energy?

• A penny sits motionless on a shelf.

• A ball rolls up an inclined ramp.

• An apple is dropped from a second-story window.

• A water particle flows down a mountain stream.

Tags

NGSS.MS-PS3-5

Which of the following is an example of kinetic energy being converted to potential energy?

• At an ice rink, an ice skater gives another ice skater a gentle push.

• A bike rider stops pedaling and lets his bicycle coast up a hill.

• The cord of a bow-and-arrow is released, propelling the arrow forward.

• On a factory assembly line, boxes slide down a ramp.

Tags

NGSS.MS-PS3-2

NGSS.MS-PS3-5

An asteroid is falling toward planet Earth from space. It has a height of 100,000 km.

As the asteroid falls closer to the Earth's surface, its _______ energy decreases and its _______ energy increases.

• chemical; heat

• kinetic; gravitational potential

• heat; chemical

• gravitational potential; kinetic

Tags

NGSS.MS-PS3-5

The following diagram of a pendulum shows the path it takes as it swings back and forth.

As the pendulum moves from point 1 to point 2, what happens to its mechanical energy?

• Kinetic energy is converted to potential energy and back again.

• Potential energy is converted to kinetic energy only once.

• Potential energy is converted to kinetic energy and back again.

• Kinetic energy is converted to potential energy only once.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Danielle has a rubber band. She stretches the rubber band with her fingers. After she releases the rubber band, it flies through the air.

Which of the following is true about the energy of the rubber band?

• Both the stretched rubber band and the released rubber band have only kinetic energy.

• The stretched rubber band has more potential energy, and the released rubber band has more kinetic energy.

• The stretched rubber band has more kinetic energy, and the released rubber band has more potential energy.

• Both the stretched rubber band and the released rubber band have only potential energy.

Tags

NGSS.MS-PS3-5