work and power test review thurs may 23. formulas: take these down since they will not be on the...
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Work and Power Test Review
Thurs May 23
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Formulas: Take these down since they will not be on the test.
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Formulas: Take these down since they will not be on the test.
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Formulas: Take these down since they will not be on the test.
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Formulas: Take these down since they will not be on the test.
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Units: If you do a problem and don’t include the units in an answer you get no crecit
• Work= Joules• Power = Watts• KE= Joules• PE = Joules• F= Newtons• M= kg• D= m
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Format of Test
a)10 True and Falseb)24 Multiple choicec)5 Math problems
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Question 1
• As the mass increases the kinetic energy increases.
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Question 2
• All forms of energy are just the same thing.
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Question 3
• Energy is measured in joules.
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Question 4
• In a car engine burning fuel produces heat.
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Question 5
• Light energy travels from the sun and is transformed to chemical energy by plants.
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Question 6
• On a swing the kinetic energy is the greatest at the lowest point.
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Question 7
• Energy doesn’t necessarily involve motion.
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Question 8
• Energy is the ability to do work.• Energy is the ability to cause
change.
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Question 9
• Raising an object increases its potential energy.
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Question 10
• Work is done when an object is moved and the force that causes the motion is in the same direction as the movement.
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Question 11
• A power problem.
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Question 12
• Kinetic energy = the energy of motion.
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Question 13
• During nuclear reactions mass is converted to energy.
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Question 14
• A kinetic energy problem.
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Question 15
• The formula for work is W=Fd or Work= force x distance.
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Question 16
• Joules are the units for work
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Question 17
• Gravitational potential energy is the energy of an object due to its position.
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Question 18
• If you double the velocity of an object its kinetic energy is quadrupled since the formula involves the square of the velocity. The square of two is four.
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Question 19
• Power is the rate at which work is done.
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Question 20
• Law of conservation of energy.
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‘
Question 21
questio
• Definiton of power.
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Question 22
• A work problem.
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Question 23
• When you wind a watch you are working with a spring inside the watch which involves elastic potential energy.
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Question 24
• Definition of power.
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Question 25
• A power problem.
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Question 26
• Calculate the work done in a situation
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Question 27
• The kinetic energy of an object increases as its velocity increases.
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Question 28
• Mechanical energy is the sum of the kinetic and potential energy of an object.
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Question 29
• A vehicle converts the chemical energy of the fuel into kinetic energy.
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Question 30
• A work problem.
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Question 31
• A kinetic energy problem. Remember the potential energy at the top equals the kinetic energy at the bottom.
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Question 32
• Find the object in a list that does not use electric energy
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Question 33
• Watts are the units of power.
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Question 34
• Definition of elastic potential energy.
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Bubba picks up a 250 kg sack of grain and puts it on his shoulder 1.2 m above the ground. What is the potential energy of the grain?Given Work Answer
M=250 kgH=1.2G= 9.8
W=PEPE=mghPE= 250 (9.8) 1.2
2940 J
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A 90-kg male gymnast does the iron cross 4.5 m above the floor. Find his potential energy. Given Work Answer
M=90 kgH=4.5G= 9.8
W=PEPE=mghPE= 90 (9.8) 4.5
3969 J
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A 10-kg bicycle carrying a 90-kg guy is traveling at a speed of 7 m/s. What is the kinetic energy of the guy and the bicycle?
Given Work Answer
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A ball weighs 7.6 N and can be kicked a distance of 1.5 m. What is the work applied to the soccer ball? Given Work Answer
F= 7.6D= 1.5
W=FdW= 7.6 (1.5)
11.4 J
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How much work is applied to your backpack if 100 W of power are used for 25 seconds? Given Work Answer
P= 100 WT= 25 s
P=W/tW=PtW= 2500
2500 J