Mechanical Energy and Machines

Kendrick drags his bat out to the field to play baseball. Which statement best describes the science of what he did?

• He used kinetic energy to move the bat

• He used potential energy to move the bat

• He would use less energy if he dragged the bat faster

• He did not have to work to move his bat because he dragged it

Tags

NGSS.MS-PS3-5

You pull your desk along the floor in your classroom. What does this situation best demonstrate?

• An alternative energy source

• Potential energy

• Gravity

• Scientific Work

Tags

NGSS.MS-PS2-2

A red car and a blue car are moving down the road. The two cars are just alike other than the color. Which car has the most kinetic energy?

• The one that is moving faster

• The one that is on the highest hill

• The one that is moving uphill

• The one that is moving downhill

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-1

Patty lifts a clean plate up into a kitchen cabinet to put it away. What type of energy is stored in the plate as it sits in the cabinet?

• Kinetic energy

• Solar energy

• Sound energy

• Potential energy

Tags

NGSS.MS-PS3-2

Patty's brother accidentally drops his plate. It falls to the floor and breaks. What do we know about energy in this example?

• There is no change in form of energy

• Energy is changed from one form to another

• Energy is destroyed when the plate breaks

• Energy is created when the plate is dropped

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4

A book sits on the edge of Sammy's desk. Which statement is true about the energy this book has? What type of energy does the book have?

• Kinetic energy because it is heavy

• Kinetic energy because it could be moved

• Potential energy because it is not moving

• Potential energy because it could fall to the floor

Tags

NGSS.MS-PS3-2

As part of a science activity, Eddie stretches a rubber band, lets it go and it flies 4 meters. Which statement below most accurately describes what happened?

• The energy in the rubber band will be lost

• The stretched rubber band has kinetic energy

• Stretching a rubber band does not require work

• A flying rubber band has kinetic energy

Tags

NGSS.MS-PS3-5

The custodian at your school helps you by sliding a heavy box of books up the wheelchair ramp in front of your school. What type of machine is the wheelchair ramp?

• A lever

• A pulley

• An inclined plane

• A wheel and axle

A moving truck is loading heavy furniture using a long ramp. Why does this simple machine make the work easier?

• The furniture fits on the ramp

• The ramp makes the furniture lighter

• It takes less force to move the furniture up the long ramp

• The ramp acts like a lever to make the work easier

How could you reduce the force needed to do work with a lever?

• Make it longer

• Make it shorter

• Move the fulcrum toward the effort arm

• Add weight