-how do we use friction in our everyday lives? -name 3 professionals that have to consider friction...
TRANSCRIPT
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- How do we use friction in our everyday lives?
- Name 3 professionals that have to consider friction when doing their job. Explain
Warm up
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Rubber meets the Road• Finish your Questions from yesterday and
then answer the following questions in your journal:
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Kinetic Energy
• http://www.brainpop.com/science/energy/kineticenergy/
• Get a whiteboard and Marker!!• What unit would I use for the following:
– Work– Kinetic Energy– Power– GPE– Force
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- 2 hikers climbed a 1200 meter mountain. Hiker #1 is 43 kg and climbed the mountain in 3 hours the other hiker #2 is 72 kg climbed the mountain in 5 hours. How much power did each hiker have?
On your Whiteboard
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• If a force is being applied on an object how do you know if the thing applying force is doing work to the object?
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• A 56 g bird flies at an acceleration of 4m/s2 to escape a circling hawk. How much Force does this bird have?
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• A 7345 g dog runs to it’s owner with a force of 4.5 N. What is the acceleration of the dog?
• How much force would the owner need to stop the dog?
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• How much power would a 2 ton car have that pulled a camper 400cm with a force of 20 N in 10 seconds.
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• When you step into clay and make a foot print are you transferring any energy?
• Are you transforming any energy? If so explain?
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• Draw an energy chain of a tennis player hitting a ball. Start will the racket pulled back ready to swing and the ball in motion in front of the player end with the ball hitting the ground
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• If I told you that within a closed system a system only has 3 forms of energy KE, GPE, and HE and this system had the following:– 1542 J of total energy – 134 J of Kinetic Energy – 1045 J of GPE How much HE would the system have? What law would help explain this?
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• What is the kinetic energy of a .46 kg bullet traveling 500 m/s?
• What is the kinetic energy of a .53 kg bullet traveling 200 m/s?
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• Calculate the kinetic energy in joules of a 4000 kg car moving at the following speeds:
• 47.52 m/s
• 22 m/s
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• Calculate the GPE in the following systems:
• a car with a mass of 1890kg at the top of a 52m high hill
• a 74 kg climber on top of Mount Everest (8900 m high)