# PHYSCI Fundamentals Of Physical Science

### Task Multiple Choice in PHYSCI Fundamentals Of Physical Science

1.A 1000-kg car is traveling at a speed of 10 m/s. If the speed of the car is increased to 20 m/s, the car’s kinetic energy is

A.doubled

B.halved

D.unchanged

2.The law of conservation of energy states:

A. mass is a form of energy

B. it is illegal to waste energy

C. the end product of all energy transformation is heat

D. energy transformations occur without a net gain or loss of energy

3. The SI unit for work is the

A. joule

B. watt

C. calorie

D. newton

4. The SI unit of energy is named after

A. Albert Einstein   B. James Prescott Joule     C. Count Rumford      D. James Watt

5.  The property something has that enables it to do work is

A. mass

B. force

C.  momentum

D. energy

6. The wound spring of a watch possesses ___________ energy

A. potential                                             B.  kinetic

C. chemical                                             D. zero

7. A 75-kg window air conditioner falls a distance of 6 m to the street below (no one is injured). What was the PE of the air conditioner while it sat at rest within the window frame?

A. 735 J

B. 2205 J

C. 3601.5 J

D. 4410 J

8. In the cylinder of an automobile engine, the chemical energy of gasoline is initially transformed into

A. mechanical energy                                         B. heat energy

C. chemical energy                                             D. potential energy

9. When the height of an object is changed, the gravitational potential energy ________

A. decreases

B. increases

C. depends on the reference point

D. remains constant

10. Which of the following objects has the greatest kinetic energy?

A. an object with a mass of 4m and a velocity of v

B.an object with a mass of 3m and a velocity of 2v

C.an object with a mass of m and a velocity of 4

D. an object with a mass of 2m and a velocity of 3v

Decide whether each statement is true or false.

__________   11. In a nuclear weapon, a small amount of matter is converted into energy.

__________   12. Energy can be defined as the rate at which work is done.

__________   13. Kinetic energy may be thought of as the energy of motion.

__________   14. Farmer Ben attempts to remove an 80-kg rock from his field. If he applies a force of 789 N for 10 seconds yet fails to move the rock, he has done no work.

__________   15. Upon eating food, the chemical energy contained within the food is destroyed by the process of digestion.

Fill in the Blank

16. Potential energy is often referred to as the energy of ___________ and kinetic energy as the energy of ______________.

17. The SI unit for power is ________________

18. In the United states, the ______________ sector consumes the most energy.

19. The total energy of a(n) _____________ system remains constant.

20.  ________________ energy sources cannot be exhausted.

Matching

21. _________Rest Energy  a.  measure of the tendency of a moving object to  continue motion along a straight line

b.   the energy an object has by virtue of it mass

22. _________ Angular Momentum

c.   one newton-meter

23. _________ Linear Momentum  d.  the energy an object has by virtue of its position

24. _________ joule                     e.  measure of the tendency of a rotating object to continue spinning about a fixed axis

25. _________ potential energy

26.Distinguish between total energy and mechanical energy. When is total energy conserved? When is mechanical energy conserved?

27.A horizontal force of 80 N is used to move a 20-kg crate across a level floor. How much work is done when the crate is moved 5 m? How much work would have been done if the crate’s mass were 30 kg?

28.How much work is needed to raise a 110-kg load of bricks 12 m above the ground to a building under construction?

29.A total of 490 J of work is needed to lift a body of unknown mass through a height of 10 m. What is its mass?

30.How much power must the legs of a 50-kg woman develop in order to run up a staircase 5 m high in 7 s?

31.An 80-kg mountaineer climbs a 3000-m mountain in 10 h. What is the average power output during the climb?

32.A weightlifter raises a 90-kg barbell from the floor to a height of 2.2 m in 0.6 s. What was his average power output during the lift?

33.A 1200-kg car is moving at a speed of 15 m/s. Find its kinetic energy.

34.What is the speed of an 800-kg car whose kinetic energy is 250 kJ?

35. A student who weighs 556 N climbs a stairway (vertical height of 4.0 m) in 25 s.

a.How much work is done?

b.What is the power output of the student?

PHYSCI Fundamentals Of Physical Science 