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Unit 6 review energy forces motion

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  • What happens at B?
    The object maintains a constant speed
  • describe the motion in graph B
    constant speed
  • the international space shuttle orbits Earth at a constant speed of 17500 mph. every hour it thrusts forward a small amount due to the air resistance it encounters. What is the overall net force applied on the ISS?
    0 - it is balanced.
  • Jamie drove 340 miles from Mammoth to Los Angeles. It took her 5 hours. What was her average speed? include the units
    speed = distance/ time so her 68 mph
  • at which point is the potential and kinetic energy about the same?
    answer varies.
  • a 50kg skateboarder is pushed by a friend with a force of 150N. What is the skateboarder's acceleration? Use the correct units.
    3 m/s2
  • a hang glider experiences a net force of 250 N and accelerates at 2 m/s2. what is the hang glider's mass? include the units
    125 kg
  • James wants to Main Beach from TMS. It takes him 30 minutes at an average speed of 5 mph. How far is it?
    distance = speed x time so 5mph x 0.5 hours = 2.5 miles
  • calculate the average acceleration of the last segment of this graph. use correct units.
    -1.3 m/s2
  • Describe the motion in graph D
    acceleration - speeding up
  • Which of the speed-time graphs shows an object accelerating from rest and then maintaining a constant speed.
    A
  • Liz is 60 m from home and walks at a steady pace of 4 m/s. How long will it take her to get home?
    time = distance / speed so it will take 15 sec.
  • A car is traveling 70 mph. What are the possible things that can happen when an unbalanced force is applied?
    acceleration- speed up, slow down, or change directions.
  • Luke is hungry after sleeping for 10 hours. He looks at the pancake breakfast his mom has made for him. This breakfast will provide him with what types of energy? form and type
    potential chemical
  • a fire burns wood and demonstrates conservation of energy. How is energy being conserved? Be descriptive and use names of the types of energy.
    converted from potential chemical energy to heat and light (thermal and electromagnetic/radiant kinetic energy)
  • Identify something in these images that should NOT be used as a reference point.
    anything that isn't stationary like the airplane, the man, and the clouds, sun, etc
  • explain how the motion in the first graph is different from all the other graphs.
    the first graph is the only one that shows constant speed. the others accelerate.
  • what is the difference between the motion at A vs C?
    A has a faster acceleration than C
  • Nancy pushes a stationary box with the force of 750 N to the left. Friction between the floor and the box exerts a force of 600 N. what will happen to the box? Provide direction and magnitude.
    150 N to the left
  • What is the difference between the motion in these two graphs?
    top = no motion/ stopped. bottom = constant speed.
  • a 40 kg motorcycle accelerates at 5 m/s2. What force is needed to produce this acceleration? Include the unit.
    200 N
  • Explain the difference between velocity and acceleration.
    velocity is speed + direction, and acceleration is when the velocity changes (that means slowing down, speeding up, or changing directions)
  • Yohan rides his e-bike around town. Explain what is happening at the last part of his trip. describe motion and rate/speed.
    he's going back home at a constant speed.
  • At which point would the roller coaster car experience the highest kinetic energy?
    at the bottom of the the first hill
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