Understanding Work and Energy Concepts

A box is pushed across a floor with a force of 10 N over a distance of 5 meters. Calculate the work done on the box.

• 15 J

• 50 J

• 5 J

• 100 J

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NGSS.MS-PS3-4

NGSS.MS-PS3-5

Explain how energy is transformed when a ball is thrown into the air and then falls back to the ground.

• Kinetic energy is transformed into potential energy and back into kinetic energy.

• Potential energy is transformed into thermal energy.

• Kinetic energy is transformed into thermal energy.

• Potential energy is transformed into sound energy.

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NGSS.MS-PS3-4

NGSS.MS-PS3-5

• 196 J

• 40 J

• 392 J

• 20 J

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NGSS.MS-PS3-4

Describe how energy, motion, force, and work are related when a car accelerates on a highway.

• The car's engine converts chemical energy into kinetic energy, increasing motion through force, resulting in work done on the car.

• The car's engine converts thermal energy into potential energy, decreasing motion through force, resulting in no work done.

• The car's engine converts sound energy into kinetic energy, increasing motion through force, resulting in work done on the car.

• The car's engine converts electrical energy into potential energy, increasing motion through force, resulting in work done on the car.

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS3-1

NGSS.MS-PS3-5

In which of the following scenarios is work being done?

• Holding a book stationary above your head.

• Pushing a car that doesn't move.

• Lifting a backpack from the floor to a table.

• Leaning against a wall.

Tags

NGSS.MS-PS3-5

Suggest a way to increase the amount of work done when lifting an object.

• Increase the distance the object is lifted.

• Decrease the force applied to the object.

• Lift the object more slowly.

• Use a lighter object.

A cyclist is riding up a hill. Explain the energy transformation taking place.

• Kinetic energy is transformed into potential energy.

• Potential energy is transformed into kinetic energy.

• Thermal energy is transformed into sound energy.

• Chemical energy is transformed into electrical energy.

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NGSS.MS-PS3-2

NGSS.MS-PS3-4

NGSS.MS-PS3-5

How does the concept of force relate to work done when pushing a shopping cart?

• Work is done when force is applied and the cart moves in the direction of the force.

• Work is done only when the cart is stationary.

• Work is done when force is applied, regardless of the cart's movement.

• Work is done when the cart moves in the opposite direction of the force.

Tags

NGSS.MS-PS3-5

A 50 N force is applied to move a box 3 meters across a floor. How much work is done?

• 150 J

• 50 J

• 100 J

• 200 J

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-4

Explain the energy transformation when a roller coaster descends from the top of a hill.

• Potential energy is transformed into kinetic energy.

• Kinetic energy is transformed into potential energy.

• Thermal energy is transformed into sound energy.

• Chemical energy is transformed into electrical energy.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5