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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