work energy and power

An object has 12.4 J of potential energy and 23.5 J of kinetic energy. What is the mechanical energy of the system?

• 11.1 J

• 1.895 J

• 35.9 J

• 291.4 J

Tags

NGSS.HS-PS3-1

What is the kinetic energy of an 9 kg bowling ball rolling at 3.30 m/s?

• 29.7 J

• 323.4 J

• 49.005 J

• 14.85 J

Tags

NGSS.MS-PS3-1

An 80 kg skier stands at the top of a 40 meter slope. What is her gravitational potential energy before she skies down the slope?

• 3200 J

• 31,360 J

• 15,680 J

• 19.6 J

Tags

NGSS.MS-PS3-2

If you hold a 20 N object 2 m off of the ground, how much work have you done?

• 40 J of Work

• 10 J of Work

• No Work

• 18 J of Work

Tags

NGSS.MS-PS2-4

If you drive your 1,000 kg car from sea level up to the Nu'uanu Pali lookout, which is 366 m above sea level, how much will you have increased your car's gravitational potential energy?

• 3,000,000 J

• 366,000 J

• 3,586,800 J

• 586,800 J

Tags

NGSS.HS-PS3-1

What is the kinetic energy of a 4 kg rock falling through the air at 5 m/s?

• 10 J

• 50 J

• 20 J

• 200 J

Tags

NGSS.MS-PS3-1

You’re watching a volleyball game and someone asks you what type of energy best describe the movement of the volleyball players. Which of the following choices should your answer be in order to be correct?

• Chemical

• Sound

• Mechanical

• Potential

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Where would a car traveling on a roller coaster track have the most potential energy?

• At the bottom

• Halfway to the top

• at the top

• halfway to the bottom

• It is always the same

Tags

NGSS.MS-PS3-2

For work to be done on an object,

• some force need only be exerted on the object.

• the object must move some distance as a result of a force.

• the object must move, whether or not a force is exerted on it.

• the object must not move.

Tags

NGSS.MS-PS2-2

The SI unit of energy is _________________?

• Newton metre (Nm)
• Newton per metre  (N/m)
• Joule (J)
• Joule per metre (J/m)