KNOWING WHAT YOU ALREADY KNOW (PRE-ASSESSMENT)

Direction: Choose the letter of the best answer and write this on your answer sheet.

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

A. a person sitting on the chair c. a person walking with a load on its head

B. a person pushing the wall D. a person lifting a box

2) Which of these equations gives the amount of work done?

A. Work = F/d C. Work = Fd

B. Work = Fgd D. Work = F/t

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

A. zero C. 9.8

B. 2 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 C. 20

B. 10 D. 40
5) What will happen to the value of work if the distance is increased?

A. remains the same

B. increase

C. decrease

D. will increase and decrease

6) The ability to do work is called:

A. Power

B. Energy

C. Work

D. Force

7) Energy is measured in:

A. Horsepower

B. Joules

C. Newtons

D. Kilogram

8) Stored energy is correctly termed as:

A. Radiant energy

B. Potential energy

C. Kinetic energy

D. Thermal energy

9) Moving energy is correctly termed as:

A. Potential energy

B. Sound energy

C. Electric energy

D. Kinetic energy

10) An example of potential energy is the energy of:

A. A stereo playing music

B. A moving arrow

C. Food

D. Fast car

11) Power in physics is the rate at which __________ is used.

A. Current

B. Speed

C. Energy

D. Force

12) To calculate power, we use the formula: Power = work divided by __________.

A. Time

B. Force

C. Energy

D. Mass

13) What is the standard unit of measurement for power?

A. Joule

B. Kilogram

C. Meter per second

D. Watt

14) If it takes 10 J of work to move a rock 15 meters in 5 seconds, what is the power?

A. 1 watt

B. 2 watts

C. 3 watts

D. 4 watts

15) If it takes 50 J of work to climb a set of stairs, how fast would you have to climb them to use 5

Watts of power?

A. 2 s

B. 5 s

C. 9 s

D. 10 s​