Physics Exam
Essential information:

Steps of the scientific method (in order):
·Observation of a problem
·Research
·Hypothesis
·Experiment
·Analyze data
·Conclusion

Base units  Cannot be broken down, only measured
Derived units  Must be calculated by a formula

Experimental design
·experimental (i.e., independent) variable  The one variable is manipulated.
·dependent variable  That which changes in response to the manipulation.
·control variables  Things that are kept the same.

1st class lever:

2nd class lever:

3rd class lever:

Formulas

v = d/t

a = (vf  vi) / t

p = mv

F = ma

KE = ½ m v2

PE = mgh

W = Fd

P = W/t

Input F      Output d
Output F    Input d
1st semester final

Formulas:
v = d/t    a = (vf  vi) / tp = mv    F = ma
KE = ½ m v2PE = mghW = FdP = W/t

Input F      Output d
Output F    Input d

Measurement

1. Which of the following is an example of a base unit?
A) metersB) Newtons
C) meters/secondD) Joules

2. Which units are each of the following measured in typically?:
Acceleration:
A) JB) m/sC) m/s2
D) NewtonsE) Watts

3. Force:
A) kilogramsB) JC) m/s2
D) NewtonsE) Watts

4. Work:
A) kilogramsB) JC) m/s
D) NewtonsE) Watts

5. Power:
A) kilogramsB) JC) m/s2
D) NewtonsE) Watts

6. Kinetic Energy
A) kilogramsB) JC) m/s
D) m/s2E) Watts

7. What units must the mass be measured in to calculate force?
A) kilogramsB) NewtonsC) m/s
D) m/s2E) Joules

8. What units must the distance be measured in to calculate work, KE, or PE?
A) gramsB) kilogramsC) kilometers
D) metersE) m/s

Scientific method

9. Which of the following is example of a hypothesis?
A) I refuse to believe that nothing travels faster than light.
B) Sunlight is necessary for plants to grow.
C) Will this drug cure cancer?
D) I forgot my calculator.

10. The graph shows a trend for the amount of energy to increase every time the height of the ramp was increased.
A) ObservationB) Research
C) AnalysisD) Conclusion

11. The hypothesis was correct that the symptoms were caused by exposure to radiation.
A) ObservationB) Research
C) AnalysisD) Conclusion

12. A student looks up what types of frogs hibernate in the winter.
A) ObservationB) Research
C) AnalysisD) Conclusion

13. There is a disproportionate number of children with cancer living near the chemical plant.
A) ObservationB) Research
C) AnalysisD) Conclusion

14. In the KE/PE lab, what variable was the height of the ramp.
A) control variable
B) dependent variable
C) experimental (i.e., independent) variable

15. In the KE/PE lab, what variable was the kinetic energy of the ball.
A) control variable
B) dependent variable
C) experimental (i.e., independent) variable

16. What variable should you have only one of in an experiment?
A) control variable
B) dependent variable
C) experimental (i.e., independent) variable

Motion, Force, and Acceleration

17. What is the velocity of a bullet that travels 400 meters in 7 seconds?
A) 57 m/sB) 57 m/s2
C) 2800 m/sD) 2800 m/s2

18. If a car is traveling at 70 km/hr, how far will it travel in half an hour?
A) 35 kmB) 210 kmC) 350 km

19. Which has more momentum: A 5 kg soccer ball moving at 100 m/s or a 20 kg cannon ball moving at 30 m/s?
A) The soccer ball
B) The cannon ball
C) Both are the same

20. If a skier increases speed from 2.0 m/s to 4.5 m/s in 5 seconds, what is her acceleration?
A) 7.5 m/s2B) 0.5 m/s2
C) -7.5 m/s2D) -0.5 m/s2

21. Describe what is happening to the car whose movement is described in the following graphs:
A) The object is speeding up. Position
B) The object is slowing down.
C) The object is moving at a constant speed.
D) The object is not moving at all.Time

22. In the graph above, which is the independent variable?
A) accelerationB) position
C) timeD) velocity

23. In the graph above, which is the dependent variable?
A) accelerationB) position
C) timeD) velocity

Which of Newtons Laws of Motion is each of the following the best example of?

24. It takes more force to throw a shot put than to throw a tennis ball.
A) 1st lawB) 2nd lawC) 3rd law

25. Bat broke when it was swung and struck the baseball.
A) 1st lawB) 2nd lawC) 3rd law

26. The space probe Voyager II is continuing on a path out of the solar system.
A) 1st lawB) 2nd lawC) 3rd law

27. What is the net force necessary to accelerate a 10 kg bicycle forward at 2.0 m/s2?
A) 0.5 NB) 5 N
C) 10 ND) 20 N

28. A flower pot falls from a ledge at 9.8 m/s2  If it hits the ground with 5.0 N of force, how much mass was in the flower pot?
A) 0.51 kgB) 1.96 kg
C) 4.9 kgD) 49 kg

Work, Power, and Machines

29. How much work is done by a forklift raising a 400 N crate from the ground to a height of 14 meters?
A) 28.6 JB) 28.6 W
C) 5600 JD) 5600 W

30. How far would a ball have to roll if it had 40 N of force and was doing 170 J of work?
A) 4.25 mB) 4.25 m/s2
C) 6800 mD) 6800 m/s2

31. How much power is required to push a box with a force of 10 N over 20 m in 30 seconds?
A) 0.67 WattsB) 1 Watts
C) 6.7 WattsD) 15 Watts

32. How much work is done by a machine with a power output of 500 Watts if it has been running for a minute and a half?
A) 5.56B) 333
C) 750D) 45000

33. Using the definition of mechanical advantage, what is the output force when the input force is 4 N and the input distance is 12 meters while the output distance is 16 meters?
A) 3 NB) 5.3 N C) 48 N

What type of simple machine is each of the following?

34. baseball bat
A) inclined planeB) screwC) lever
D) wheel and axelE) pulley

35. spiral staircase
A) inclined planeB) screwC) lever
D) wheel and axelE) pulley

36. wrench
A) inclined planeB) screwC) lever
D) wheel and axelE) pulley

37. handicap ramp
A) inclined planeB) screwC) lever
D) wheel and axelE) pulley

Which class of lever it is each of the following?:

38. wheelbarrow
A) 1st class leverB) 2nd class leverC) 3rd class lever:

39. hammer pulling a nail
A) 1st class leverB) 2nd class leverC) 3rd class lever:

40. pliers
A) 1st class leverB) 2nd class leverC) 3rd class lever:

41. Which three simple machines belong in the same family?
A) inclined plane, screw, and lever
B) lever, wheel and axel, and pulley
C) inclined plane, pulley, and screw
D) lever, screw, and inclined plane

Energy

42. What is the gravitational PE of a 850 kg roller coaster car at the top of a 45 m high part of the track?
A) 18.9 JB) 3903 J
C) 38250 JD) 374850 J

43. How much mass does a rock with 75 J of potential energy have if it is 12 m above the ground?
A) 0.63 kgB) 6.25 kg
C) 900 kgD) 8829 kg

44. What is the kinetic energy of a 3500 kg meteor falling at 7000 m/s?
A) 4 JB) 24,500,000 J
C) 171,500,000,000 JD) 85,750,000,000 J

45. What is the efficiency of a system if it takes 900 J of work to move a 75 N crate that should theoretically only requires 750 J of work to move up a 10 m ramp?
A) 0.833%B) 8.3%
C) 12%D) 83.3%

Forms of energy: Tell which type of energy each of the following is an example of:

46. Windmills grinding flour
A) mechanicalB) chemical
C) nuclearD) electromagnetic

47. Uranium rods fueling a power plant
A) mechanicalB) chemical
C) nuclearD) electromagnetic

48. Lightning
A) mechanicalB) chemical
C) nuclearD) electromagnetic

49. Plants convert:
A) chemical energy to nuclear energy
B) electromagnetic energy to chemical energy
C) electromagnetic energy to nuclear energy
D) mechanical energy to chemical energy

50. A roller coaster moving down an incline is an of:
A) kinetic energy being converted to potential energy
B) potential energy being converted to kinetic energy