A sky diver is falling at terminal velocity. He has not yet opened his parachute. What is the direction of both the velocity and his acceleration?

• A

• B

• C

• D

Four objects are shown below. Each is acted on by two forces.

Which of the objects is in equilibrium ?

• A

• B

• C

• D

What is the efficiency of a solar cell if 1000 J of solar energy hits the cell and 200 J are converted into electrical energy?

• 10%

• 20%

• 30%

• 40%

Tags

NGSS.HS-PS3-3

What is electrical energy converted into when a drill is used?

• Kinetic energy

• Sound

• Heat

• All of the above

Tags

NGSS.HS-PS3-3

• A

• B

• C

• D

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-3

What is designed to change electrical energy into kinetic energy?

• A. capacitor

• B. generator

• C. motor

• D. transformer

Tags

NGSS.HS-PS3-3

When an object moves in a straight line, which statement is true?

• When the object moves at a constant speed, the resultant force is zero

• When the object accelerates, the resultant force is zero

• When the object moves at a constant speed, the forward force is greater than the resistive force.

• The object requires a resultant force in order to move at a constant speed.

Which of the following collections of properties contain only features which can be changed by a resultant force?

• Speed, direction, mass.

• Density, speed, shape

• Shape, speed, direction.

• Speed, direction, temperature

What is potential energy?

• moving energy

• stored energy

• renewable energy

• non renewable energy

Tags

NGSS.HS-PS3-2

• A

• B

• C

• D

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5