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Springs, Power and Friction. Power. Friction. Springs. 10. 10. 10. 20. 20. 20. 30. 30. 30. 40. 40. 40. 50. 50. 50. Power – 10 Points. QUESTION: Your toaster uses 7200 Joules every hour and therefore has this power in Watts. ANSWER: What is 2 W?. Power – 20 Points.

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Presentation Transcript
slide2

Power

Friction

Springs

10

10

10

20

20

20

30

30

30

40

40

40

50

50

50

power 10 points
Power – 10 Points
  • QUESTION:
    • Your toaster uses 7200 Joules every hour and therefore has this power in Watts.
  • ANSWER:
    • What is 2 W?
power 20 points
Power – 20 Points
  • QUESTION:
    • You have four 50 W lightbulbs in your room. You study with them on for 2 hours a day for one week and use this much energy in kWh.
  • ANSWER:
    • What is 2.8 kWh?
power 30 points
Power – 30 Points
  • QUESTION:
    • You want to lift a 900 kg elevator up 30 stories (120 m). The elevator needs to ascend at a rate of 5 seconds per story. You buy a motor with this many Watts of power.
  • ANSWER:
    • What is 7056 W?
power 40 points
Power – 40 Points
  • QUESTION:
    • Your 1200 kg car is travelling 10 m/s and uses friction to stop over 5 s. Thermal energy is generated in this process with this power.
  • ANSWER:
    • What is 12000 W?
power 50 points
Power – 50 Points
  • QUESTION:
    • You find a 10 m high waterfall where 1000 kg of water flow over it every second. If you set up a turbine to convert the water’s KE at the bottom of the waterfall into electricity, your turbine produces enough power to light this many 100-W lightbulbs.
  • ANSWER:
    • What is 980 lightbulbs?
friction 10 points
Friction – 10 Points
  • QUESTION:
    • Your 1000 kg car is travelling 5 m/s and then uses friction to stop. Friction did this much work in J.
  • ANSWER:
    • What is - 12500 J?
friction 20 points
Friction – 20 Points
  • QUESTION:
    • A 500 kg rollercoaster starts off on an 80 m high hill. If friction does -100,000 J of work between the first hill and the second, the second hill must be this high.
  • ANSWER:
    • What is 60 m?
friction 30 points
Friction – 30 Points
  • QUESTION:
    • A cross-country skier crosses a patch of snow with coefficient of friction = 0.1. If she starts off going 10 m/s, she travels this far along the snow before friction stops her.
  • ANSWER:
    • What is 51 m?
friction 40 points
Friction – 40 Points
  • QUESTION:
    • A 10-m tall grassy hill has a coefficient of friction of 0.15 and a slope of 30 degrees. A box moves this fast at the bottom of this hill.
  • ANSWER:
    • What is 12.0 m/s?
friction 50 points
Friction – 50 Points
  • QUESTION:
    • A 10 m tall grassy hill has a coefficient of friction of 0.12. If a box is moving 10 m/s at the bottom of the hill, the hill has this slope.
  • ANSWER:
    • What is 13.8 degrees?
springs 10 points
Springs – 10 Points
  • QUESTION:
    • A spring of spring constant k = 100 N/m is stretched 0.1 m. The spring stores this much spring potential energy.
  • ANSWER:
    • What is 0.5 J?
springs 20 points
Springs – 20 Points
  • QUESTION:
    • To store 50 J of PEs, a spring with spring constant k = 150 N/m is stretched this far.
  • ANSWER:
    • What is 0.82 m?
springs 30 points
Springs – 30 Points
  • QUESTION:
    • A spring with spring constant k = 40 N/m stores 100 J of energy. At that point, the spring pulls back with this much force in N.
  • ANSWER:
    • What is 89.4 N? (or -89.4 N if pulling down or left)
springs 40 points
Springs – 40 Points
  • QUESTION:
    • A bungee jumper of mass m = 50 kg falls 20 meters before the bungee stretches and 20 meters while it stretches. This is the bungee’s spring constant in N/m.
  • ANSWER:
    • What is 98 N/m?
springs 50 points
Springs – 50 Points
  • QUESTION:
    • A bungee jumper of mass m = 75 kg falls 20 meters before her bungee (of k = 56 N/m) stretches. She stretches the bungee this far.
  • ANSWER:
    • What is 24.3 m?