Work and Energy

Water stored in a dam possesses

• (a) no energy

• (b) electrical energy

• (c) kinetic energy

• (d) potential energy

Which one of the following is not the unit of energy?

• (a) joule

• (b) newton metre

• (c) kilowatt

• (d) kilowatt hour

The rock in the picture is pushed over the edge and it begins to fall. Which type of energy conversion is taking place?

• mechanical to heat

• sound to mechanical

• potential to kinetic

• kinetic to potential

The work done on an object does not depend upon the

• (a) displacement

• (b) force applied

• (c) angle between force and displacement

• (d) initial velocity of the object

Gravitational potential energy depends on the ________ and ________ of the object. 

• Height and mass
• Friction and movement
• Mass and Movement
• Height and Friction 

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 

At which point is kinetic 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

A student turns on flashlight. What is the energy conservation that happen there?

• chemical - light - electrical

• electrical - chemical - light

• chemical - electrical - light

• light - chemical - electrical

A person boils water by using electrical stove. What type of energy conservation there?

• heat - electrical

• electrical - heat

• sound - heat

• heat - light