Conceptual Physics Chapter 21

Calculate the PE of a 20 N cat perched 10 meters above the ground.
Work = Force X Distance

• 20 J

• 200 J

• 2.04 J

• 200 W

Tags

NGSS.MS-PS3-2

Calculate the work needed to raise a 30 N cat up to a height of 4 m.

Work = Force X Distance

• 12 J

• 0 J

• 120 J

• 1.22 J

Tags

NGSS.MS-PS2-4

When my velocity triples, my kinetic energy increases by ______ times.

Kinetic energy = (1/2 mass)(velocity²)

• 9

• 3

• 1.5

• 4.5

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

NGSS.MS-PS3-5

True or false: When the distance an object moves(in the direction of applied force) = zero, the work done on the object is also zero.

• True

• False

As a pendulum swings from its highest to lowest position, what happens to its kinetic and potential energy? 

• Both the potential energy and kinetic energy decrease
• The potential energy decreases while the kinetic energy increases 
• The kinetic energy decreases while the potential energy increases 
• Bothe the potential energy and kinetic energy increase 

Tags

NGSS.MS-PS3-2

NGSS.MS-PS3-4

NGSS.MS-PS3-5

While a boulder is on the top of a hill it has what type of energy? 

• Mechanical
• Kinetic
• Potential 
• Reactive 

Unit of Energy and Unit of Work

• joule
• watt
• volt
• newton

Work  divided by Time

• momentum
• work
• power
• watt

Unit of Power

• joule
• watt
• meter
• newton

The ability of a system to do work or cause change.

• watt

• power

• energy

• work

Tags

NGSS.MS-PS3-5