physical science test 1

35. Which of the following images describing conservation of momentum is most like golf? Why?

3 bc it is a bigger ball (the club) hitting the smaller ball (the golf ball). Also the bigger ball doesn't follow the small ball

_____19. A 2-kg book is held 1 m above the floor for 50 s. The work done is a. 0 J. b. 10.2 J. c. 100 J. d. 980 J.

A. 0

_____11. The prefix kilo- stands for a. 103. b. 10-3. c. 106. d. 10-2.

A. 10^3

_____9. A person is 5 ft 8.0 in. tall. This is equivalent to a. 173 cm. b. 177 cm. c. 207 cm. d. 223 cm.

A. 173

The "scientific method" is a. A continuing process. b. A way to arrive at ultimate truth. c. A laboratory technique. d. Based on accepted laws and theories.

A. A continuing process

_____27. If I apply a force of 80N against a wall for 8 hours, but the wall doesn't move, I have a. Done no work. b. Done a lot of work. c. Exerted no effort. d. Wasted my time!

A. Done no work

_____29. When a car is rolling down a hill, its potential energy is converted into a. Kinetic energy. b. Heat (work done against friction). c. Kinetic energy and heat. d. Momentum

A. Kinetic energy

_____4. The heliocentric model of the solar system was presented by: a. Ptolemy b. Copernicus

A. Ptolemy

_____15. Which of the following sentences contains an accurate and complete measurement? a. The length of the block is 5.3 cm. b. I determined the mass of the block to be 45. c. The temperature outside today is 79. d. The car traveled down the road at 30 speed.

A. the length of the block is 5.3 CM

_____18. What never changes when two or more objects collide? a. The momentum of each object. b. The kinetic energy of each object. c. The total momentum of all the objects. d. The total kinetic energy of all the objects.

A. the momentum of each object

_____13. The speedometer of a European car gives its speed in kilometers per hour. A car traveling 80 km/hr is going how many miles/hr? a. 0.008 miles/hr. b. 128 miles/hr. c. 50 miles/hr. d. 80000 miles/hr.

B. 128 m/hr

_____3. The law of gravity a. Applies only to large bodies such as planets and stars b. Accounts for all known forces. c. Holds only in the solar system. d. Holds everywhere in the universe.

B. Accounts for all known forces

_____5. The geocentric model of the solar system was presented by: a. Ptolemy b. Copernicus

B. Copernicus

B1. Which car manufacturer is named after the star cluster Pleiades? (+2 points) a. Renault b. Subaru c. Ferrari d. Peugeot

B. Subaru

_____30. People used to think that heat was an actual substance called a. Joule. b. Caloric. c. Ether. d. Friction.

B. caloric

_____28. The work energy theorem states that Winput = ∆PE + ∆KE + Woutput. In this equation, Woutput, stands for a. Work done on the object. b. Work done by the object.

B. work done by the object

_____23. When an ice skater puts most of her mass along her spin axis, the conservation of angular momentum makes her a. Spin slower. b. Fall over. c. Spin faster. d. Stay the same speed.

C. spin faster

34. In your own words, what does the law of conservation of energy state?

Energy can not be created of destroyed but it can be changed from one energy to another type.

32. What was Kepler's main contribution to astronomy and the model of the solar system?

Planets had to move in ellipses

31. Who proposed that the earth was in the center of the solar system?

Ptolemy

_____2. A scientific law or theory is valid a. Forever. b. For a certain number of years, after which it is retested. c. As long as a committee of scientists says so. d. As long as it is not contradicted by new experimental findings.

D. As long as it is not contradicted by new experimental findings.

_____7. The period of the earth's orbit around the sun is a. One day. b. One week. c. One month. d. One year.

D. One year

_____16. The watt is a unit of a. Energy. b. Work. c. Momentum. d. Power.

D. Power

_____25. I am holding a book 1 m above a table in the third floor of a building that is 80 m above sea level. The potential energy is highest when calculated relative to a. The table. b. The floor. c. The ground floor of the building. d. Sea level.

D. Sea level

_____6. Relative to the stars, the moon and sun seem to move a. Northward. b. Southward. c. Eastward. d. Westward.

D. Westward

B2. Name the six simple machines. (Up to +6 points)

lever, pulley, wheel and axel, inclined plane, wedge, screw

33. Explain a roller coaster ride (like the one shown in the image below) in terms of potential energy and kinetic energy. When is potential energy at a maximum? When is kinetic energy at a maximum? (There is NO NEED to do any math in this question.)

potential is highest at the top and kinetic is highest at the bottom

_____14. The prefix giga- stands for a. 106. b. 109. c. 10-6. d. 10-9.

B. 10^9

B3. In the image above (Question 35), which of the situations is most like a game of pool? (+2 points)

2 bc all the balls are the same size in the game of pool just like shown in the picture and the blue ball is moved bc of the hit from the red one.

_____21. The Kinetic Energy of a 900-kg car whose speed is 16.6 m/s is a. 12.8 kJ. b. 124 kJ. c. 1.23 MJ. d. 1.62 MJ.

B. 124 kJ

_____8. A centimeter is a. 0.001 m b. 0.01 m c. 0.1 m d. 10 m

B. 0.01

_____10. The longest of the following is a. 1 mm. b. 0.00001 km. c. 0.01 in. d. 0.001 ft.

a. 1 mm

_____22. A total of 4900 J is expanded lifting a 50-kg mass. The mass is raised to a height of a. 10 m. b. 98 m. c. 960 m. d. 245,000 m.

a. 10

_____17. A moving object does not always have a. Velocity. b. Potential energy. c. Momentum. d. Kinetic energy.

a. velocity

_____26. Which of the following has the highest power output? a. A steam train that can do 50 kJ of work in 0.5 second. b. An electric train that can do 1000 kJ of work in 10 seconds. c. Both trains have the same power output. d. I don't have enough information to answer this question!

b. 1000 kJ of work in 10 seconds

_____24. What is the linear momentum of a Formula 1 car weighing 702-kg and moving at a speed of 100 m/s? a. 0.142 kg-m/s. b. 70,200 kg-m/s. c. 3,510,000 kg-m/s d. 7.02 kg-m/s.

b. 70,200

_____12. The period of the moon's orbit around the earth is a. One day. b. One week. c. One month. d. One year.

c. one month