ENERGY AND POWER

In which of the following situations is work being done from a scientist’s perspective?

• A. a person sitting on the chair

• B. a person pushing the wall

• C. a person walking with a load on its head

• D. a person lifting a box

Which of these equations gives the amount of work done?

• A. Work = F/d

• B. Work = F_gd

• C. Work = Fd

• D. Work = F/t

How much work is done in holding a 1-kg object 2 m above the ground?

• A. zero

• B. 2

• C. 9.8

• D. 19.6

4. How much work was done on an object when a constant force of 20 N pushed it 2 m away?

• A. zero

• B. 10

• C. 20

• D. 40

What will happen to the value of work if the distance is increased?

• remains the same

• increase

• decrease

• will increase and decrease

The ability to do work is called:

• power

• energy

• work

• force

Energy is measured in

• horsepower

• joules

• newton

• kilogram

Stored energy is correctly termed as:

• Radiant energy

• Potential energy

• Kinetic energy

• Thermal energy

Moving energy is correctly termed as:

• Potential energy

• Sound Energy

• Electric energy

• Kinetic energy

An example of potential energy is the energy of:

• A. A stereo playing music

• B. A moving arrow

• C. Food

• D. car