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32 Cards in this Set
- Front
- Back
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Mr. Dawson
International Science Chapter 9 TEST |
cut apart and study
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What type of device is a machine?
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it can multiply and change the direction of force inputted into it.
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What are the three things that gravitational potential energy depends on?
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1) mass of the object
2) acceleration due to gravity 3) height of the object |
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Can you name an example of mechanical energy?
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potential energy
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If a ball is sitting on top of a cliff and not moving, it is said to not have any ______________ energy.
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kinetic
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What type of energy does a spring have?
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elastic potential
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Name the three ways that mechanical energy can change into nonmechanical energy?
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1) heat
2) friction 3) sound |
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T/F Sara is doing work: "Sara is holding a book in her right hand."
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FALSE
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T/F Sara is doing work: "Sara bends over to rake the leaves."
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TRUE
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T/F Sara is doing work: "Sara is pushing against a cement wall."
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FALSE
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What is always transferred when work is done?
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ENERGY
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What is a measure of how much useful work a machine can do?
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EFFICIENCY
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Power is
a. joules b. watts |
watts
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Kinetic energy is
a. joules b. watts |
joules
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Work is
a. joules b. watts |
joules
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Force is
a. percent b. newtons |
newtons
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Mechanical advantage is
a. none b. percent |
none
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Potential energy is
a. joules b. watts |
joules
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Gravitational potential energy is
a. joules b. watts |
joules
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efficiency is
a. joules b. watts |
joules
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You and two friends apply a force of 425 N to push a piano up to 2.0 m long ramp. How much work has been done when you reach the top of the ramp?
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show your work
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If you make it to the top in 5.0s, what is your power output in watts?
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show your work
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If lifting the piano straight up would require 1700 N of force, what is the mechanical advantage of the ramp?
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show your work
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calculate kinetic or potential energy: A 45 kg chair held 1.5 m above the ground.
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show your work
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calculate kinetic or potential energy: A
21 g ball moving through the air at 15.2 km/h (hint: change g to kg and km/h to m/s |
show your work
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What is the efficiency of a machine if 61.2 J of work are done on the machine, but only 17.8 J of work are done by the machine?
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show your work
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Know formulas for the test:
Power = |
work
_______ time |
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Know formulas for the test:
work = |
force X distance
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mechanical advantage =
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output force input distance
___________________________________ input force output distance |
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potential energy =
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mass x g x height
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kinetic energy =
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1/2 mass velocity
= 1/2mv |
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efficiency =
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useful work output
___________________ work input |
