Work, Forms of Energy & Power, machines and Force

What is the equation for Work?

• W=1/2 (mv²)

• W=Fd

• W=1/2 (kx²)

• W=mgh

A joule is a unit of

• power

• heat

• energy

• current

Which of the following statements are true about work?

• Work is a form of energy.

• A Watt is the standard metric unit of work.

• Work is a time-based quantity; it is dependent upon how fast a force displaces an object.

• None of these.

Tags

NGSS.HS-PS3-2

Which of the following statements are true about power?

• If person A and person B do the same job but person B does it faster, then person A does more work but person B has more power.

• Powerful people or powerful machines are simply people or machines which always do a lot of work.

• Power refers to how fast work is done upon an object.

• None of these

Which of the following statements are true about kinetic energy?

• None of these

• Kinetic energy is the form of mechanical energy which depends upon the position of an object.

• If an object is at rest, then it does not have any kinetic energy.

• If an object is on the ground, then it does not have any kinetic energy.

Tags

NGSS.HS-PS3-2

Which of the following statements are true about potential energy?

• Both gravitational and elastic potential energy are dependent upon the speed of an object.

• Moving objects cannot have potential energy.

• None of these

• Potential energy is the energy stored in an object due to its position.

Tags

NGSS.MS-PS3-2

At which point is potential energy greatest?

• W

• X

• Y

• Z

At which point(s) on the roller coaster is the kinetic energy at its maximum?

• A
• B
• C
• D

Tags

NGSS.MS-PS3-1

When a pendulum swings, at which point is potential energy at its greatest?

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS3-2

When a pendulum swings, at which point is kinetic energy highest?

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5