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### 100 True/False questions

1. Weighhow heavy something is

2. What is friction?- a force that acts to resist motion of object, or material of contact

3. What is the normal force of an object in free fall.- J Joules

4. Velocityspeed in a given direction

5. What does weight really measure?- amount of gravity

6. What is the difference between mass and weight? Which one changes with location? Which one remains the same no matter what?- static, non moving, the object it still
- kinetic, moving

7. ResultantDescribing with a single nimber
gives magnitude only
can be both positive and negative

8. In the vertical direction, is a projectile moving at a constant velocity or acceleration? Why?- constant acceleration

9. If a ball has momentum, it must also have what type of energy?- vector

10. Displacementdistance and direction of an object's change in position from the starting point

11. Precisehow replicable a measurement is; AKA How close to the same number each measurement is

12. Speedthe amount of matter in an object

13. Projectile Motionthe curved path that an object follows when thrown, launched, or otherwise projected near the surface of Earth

14. Name 3 action-reaction pairs?the force that opposes the movement of two surfaces that are in contact and are sliding over each other

15. Which type of collision does not have conservation of mechanical energy? What happens to that energy then?- elastic
-inelastic

16. As an elevator accelerates up to the top floor?, what happens to your actual weight? What about your apparent weigh?- it gets bigger apparent, same actual

17. Why does your body want to keep going forward after an accident when the can has already stopped?- 0

18. Will you weigh more or less in an elevator moving at a constant speed up?- the smae

19. Hypothesishow replicable a measurement is; AKA How close to the same number each measurement is

20. Why is acceleration due to gravity always negative?- it is pushing down

21. What is an object's net force when it is equilibrium?- 0

22. What are the SI units for displacement, mass, time, velocity, acceleration, force, energy, momentum, and impulse?displacement: meter: m
Mass: Kilogram: Kg
Time: Seconds: s
velocity: meters per sec: m/s
acceleration: meters per sec squared: m/s2
Force: Newtons: N
Energy: Joule: J
Momentum: kg * m/s
Impulse: N*s

23. How can an object moving and still have inertia?.- when moving it will stay moving

24. Elastic Potential Energyenergy stored by something that can stretch or compress

25. What is impulse?product of force and time interval during which the force acts.
- Impulse does NOT change in a collision; impulse is the change in momentum

26. ForceA push or pull exerted on an object

27. Momentumthe product of mass and velocity
- inertia in motion

28. List Newton's three laws of motion in YOUR OWN WORDS and gives examples of each.1. inertia, an object that moves will keep moving, and object at rest will not move, unless another force acts on it
- a ball rolling across a frozen pond, it dose not slow down
2. F=ma, acceleration and mass are directly proportional to force
3. for every action there is an equal opposite reaction

29. Is a fact objective of subjective? Is it usually quantitative or qualitative?Fact- Objective
- quantitative

30. Explain conservation of momentum in your own words.- momentum stays the same though a system, same in the beginning and end, unless outside forces

31. If a bullet is fired horizontally and another is dropped from the same height, which bullet will hit the ground first?- kinetic

32. When the mass is increased, what happens to inertia?- it increases, directly proportional

33. Theoryan explanation of why things happen that is tested, but is constantly undergoing change; a synthesis of a large body of information that encompasses well-tested and verified hypotheses; not set and can undergo change

34. What is kinetic energy?energy in motion

35. Kinetic Energyenergy of motion

36. Gibe 3 examples of projectiles?- acceleration

37. What is the unit of energy?- J Joules

38. Factan objective observation that cannot be contradicted; a close agreement between competent observations who make a series of observations of the same phenomenon

39. What are the 5 steps to the scientific method?1. Question/ Recognize the Problem
2. Hypothesis
3. Predict consequences of hypothesis
4. Conduct experiment and collect data
5. Conclusion

40. What is the coefficient of friction? What are it's units? Is the coefficient of static and kinetic friction always bigger between two objects? Why?- mu
- no units
- static

41. Inelastic CollisionWhen colliding objects become entangled or coupled together, thereby generating heat or disfigurement
- Energy is lost during the collision (usually due to heat or friction); there is a change in shape

42. The force influenced by gravity is called what?- weight

43. Does a stretched out slinky on a table have gravitational or elastic potential energy?elastic- the potential to be snap back
gravitational potential energy- has potential to fall

44. A 5 kg cart moves with a velocity of 4 m/s to the left. What is the momentum of the cart?- p=-20

45. When an object moves in a circle, in which direction does the force point? What is the name of that force?- out, centripetal force

46. Accelerationan increase in speed

47. If an object is moving with a constant velocity, what is the net force acting on it?- a ball rolling acros a frozen pond

48. Give an example of something with no net force acting on it but still moving?- a ball rolling acros a frozen pond

49. If a car is traveling 30 mph needs 100 meters to stop, how much room does it need if it going at 60 mph? How about a 90 mph?60- 400
90- 1600

50. VectorDescribing with a single nimber
gives magnitude only
can be both positive and negative

51. Know how to convert to SI units (metric conversions).G*MKHDDCM*ū*N

52. What is projectile motion?- a force that acts to resist motion of object, or material of contact

53. Compare elastic and inelastic collisions.When colliding objects become entangled or coupled together, thereby generating heat or disfigurement
- Energy is lost during the collision (usually due to heat or friction); there is a change in shape

54. Describe the energy transformations as a pendulum swings back and forth.- Ug to K

55. Which will have a bigger coefficient of friction, rubber on a dry concreate or rubber on wet concreate?- 0

56. What are 2 ways an object can have positive constant acceleration? What are 2 ways an object can have negative constant acceleration?.- when moving it will stay moving

57. In the horizontal direction, is a projectile moving at a constant velocity or acceleration? Why?- constant velocity

58. What is the difference between apparent weigh and actual weight? What does a scale tell you?- 0

59. As an elevator moves with a constant velocity down towards the bottom floor, what happens to your actual weight?
What about your apparent weigh?
- out, centripetal force

60. Dimensiona mesurable extent of some kind

61. What type of force is air resistance?- acceleration

62. Kinetic Frictionthe force that opposes the movement of two surfaces that are in contact and are sliding over each other

63. If you are in space (frictionless) and you throw an object that is less massive than you, which will move away faster, you or the object? What if the object is more massive than you? What if the object is the same mass as you?- the object
- you
- both the same

64. Static Friction- a force that acts to resist motion of object, or material of contact

65. When you increase the mass of an object but apply the same amount of force, what happens to the acceleration?- the acceleration goes down

66. How does bouncing increase the impulse?- amount of gravity

67. What is the difference between static and kinetic friction?- static, non moving, the object it still
- kinetic, moving

68. Elastic CollisionWhen colliding objects become entangled or coupled together, thereby generating heat or disfigurement
- Energy is lost during the collision (usually due to heat or friction); there is a change in shape

69. Inertiathe product of mass and velocity
- inertia in motion

70. What is the difference between elastic and gravitational potential energy?Potential energy that depends on the height of an object

71. What is a force?- a push or a pull

72. If a rock in a sling-shot has 700 J of potential energy, what type of potential energy is it? How much kinetic energy will the sling-shot have after it is fired without air resistance? With air resistance?- elastic
-700 J
- less than 700 J

73. What is the name of the force that results from a surface pushing back on an object?- 0

74. Gravitational Potential EnergyPotential energy that depends on the height of an object

75. How are impulse and momentum related?- impulse is change in momentum

76. What do you bend your knees when you land?- to increase time, and decrease force

77. Why would you not require a seat belt to remain in your seat during a loop-de-loop on a roller coaster?- less acceleration, less speed
- acceleration decreases, less speed

78. If a truck and a car collide together, which has a bigger force? What has the bigger acceleration?- kinetic

79. Impulseproduct of force and time interval during which the force acts.
- Impulse does NOT change in a collision; impulse is the change in momentum

80. Mechanical Energythe total energy

81. Accuratespeed in a given direction

82. What do forces produce?energy in motion

83. What is your weight in the middle of the earth?- J Joules

84. Give an example of when something is accurate, but not precise?when you hit the target in different places

85. If you fell through the center of earth what happens to your speed as you approach the Earth's center? What about as you move away?- it gets bigger apparent, same actual

86. Is momentum a scalar or a vector quantity?- vector

87. MassA push or pull exerted on an object

88. What is a free body diagram and what is it used for?- a drawing with all forces, to show all fouces acting on it

89. ScalarDescribing with a single nimber
gives magnitude only
can be both positive and negative

90. Net Forcethe combination of all forces acting on an object

91. When would the momentum of a system not be conserved?- when energy is lost, due to outside forces acting on it, work is done

92. What type of collision takes place with the Newton's Cradle? What type of collision takes place with car crashes?- inelastic
- it is lost to heat, energy

93. What forces are shown on a free body diagram?- all fouces, tention, norma, applied, friction, cintripial, weight

94. What is inertia? Is inertia a force?- a push or a pull

95. What are 3 ways and object can change it's velocity.- impulse is change in momentum

96. What is the difference between distance and displacement? Which is a scalar and which is a vector?Distance- the total distance traveled
Displacement- the shortest distance from point a to pint b?

97. Can you have constant velocity and constant acceleration at the same time? Why or why not?1. speeding up
2. slowing down in the negative direction
1. slowing down
2. speeding up in positive acceloration

98. Will you weigh more or less in an elevator accelerating up?- more

99. Compare the momentum of a large truck moving 30 mph to the momentum of the same truck moving at 90 mph.- 0 N

100. Scientific Method1. Question/ Recognize the Problem
2. Hypothesis
3. Predict consequences of hypothesis
4. Conduct experiment and collect data
5. Conclusion