What is the formula for calculating work done when a force is applied to an object?

Which of the following is the unit of power?

• Joule

• Watt

• Newton

• Pascal

• 49 J

• 98 J

• 490 J

• 980 J

Tags

NGSS.HS-PS2-4

If a spring has a spring constant of 200 N/m and is compressed by 10 cm, what is the elastic potential energy stored in the spring?

• 0.5 J

• 1 J

• 100 J

• 10,000 J

Tags

NGSS.HS-PS3-1

Which of the following statements best describes the work-kinetic energy theorem?

• The work done on an object is equal to the change in its kinetic energy.

• The work done on an object is equal to the change in its potential energy.

• The work done on an object is equal to the sum of its kinetic and potential energy.

• The change in work done on an object is equal to its final kinetic energy

Tags

NGSS.HS-PS3-2

A car accelerates from rest to a speed of 20 m/s in 10 seconds. If the mass of the car is 1000 kg, what is the average power output of the car's engine during this time?

• 20,000 W

• 40,000 W

• 100,000 W

• 200,000 W

Tags

NGSS.HS-PS2-1

Which of the following is an example of nonmechanical energy?

• Kinetic energy

• Potential energy

• Thermal energy

• Elastic potential energy

Tags

NGSS.HS-PS3-4

A 2 kg object is moving with a velocity of 3 m/s. What is its kinetic energy?

• 3 J

• 6 J

• 9 J

• 18 J

Tags

NGSS.HS-PS3-1

According to Hooke's Law, what is the relationship between the force exerted by a spring and its displacement? (Note: disregard the negative sign showing that the force from the spring is directed in the opposite direction of the applied force.)

A roller coaster car of mass 500 kg is at the top of a hill 30 m high. Assuming no friction, what is the speed of the car at the bottom of the hill?

• 10 m/s

• 15 m/s

• 20 m/s

• 24.3 m/s

Tags

NGSS.HS-PS3-2