Extra Energy Practice

A 10 kg box is pulled a distance of 3m by a force of 30 N.

The work done is

• 9 J

• 30 J

• 90 J

• 900 J

A girl weighs 400 N. She runs up a flight of stairs of height 5 m in 4 seconds. Her power is:

• 320 W

• 400 W

• 500 W

• 2 000 W

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.

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.

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

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

• 1
• 2
• 3
• 4

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

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Which of the following is an exmaple of a change of kinetic energy into gravitational potential energy?

• a person parachuting out of a plane
• a car racing around an oval track
• a person skiing down a hill
• a person walking up a hill

How much KE does a moving 6 kilogram object have if it moves with a velocity of 3 m/s?

• 9 J

• 18 J

• 27 J

• 2 J