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Chapter 12 Quiz

So close but so far away...

TermDefinition
True or False: Work done can be either positive or negative True
Work changes (adds to or takes away from) the ________ of an object or system Energy
When an object is pushed, it gains what? Kinetic Energy
In order for a box to gain kinetic energy, ________ must be done on it. Work
These two things are EQUAL to each other. Work and Change in Energy
Does friction add or take away kinetic energy? It takes away kinetic energy
A crane uses an average force of 4000 N to lift a girder 20 m. How much work does the crane do on the girder? Include the proper unit. 80,000 J
An apple weighing 1 N falls through a distance of 1 m. How much work is done on the apple by the force of gravity? 1 J
The breaks on a bicycle apply 125 N of frictional force to the wheels as the bicycle travels 14 m. How much work have the breaks done on the bicycle? 1,750 J
While rowing in a race, John uses his arms to exert a force of 165 N per stroke while pulling the oar .8 m. How much work does he do in 30 strokes? 3,960 J
A mechanic uses a hydraulic lift to raise a 1,200 kg car .5 m off the ground. How much work does the lift do on the car? 600 J
The quantity to measures work in relation to time is _. Power
Power is measured in: Watts
While rowing across the lake during a race, John does 3,960 J of work on the oars every 60.0 s. What is his power output in watts? 66 W
Every second, a certain coal-fired power plant produces enough electricity to do 900 MJ of work. What is the power output of this power plant in units of watts (or in units of mega watts)? 900 MW
Using a jack, a mechanic does 5350 J of work to lift a car .5 m in 50.0 s. What is the mechanics power output? 107 W
Calculate the mechanical advantage of a ramp that is 5.0m long and 2.5m high. 2
List some examples in which work is being done. Lifting a spoonful of soup to your mouth, letting a pencil fall to the ground, Pushing your 10 year old cousin's head from above to below water.
A short ramp and a long ramp both reach a height of 1m. Which has a greater mechanical advantage? The longer ramp.
This term refers to the amount of matter contained in an object. Mass
This term refers to a force being used to move an object. Work
This is the standard unit for measuring energy. Joules
Which is a type of potential energy? Chemical, sound, electrical, thermal Chemical
Which is a type of kinetic energy? Sound, gravitational, elastic, nuclear Sound
This is they type of energy stored in a battery. Chemical, Potential
This type of energy is a measure of how fast the particles of an object are moving. Thermal
A 20 pound weight or a 2 pound rock. Which one would have more potential energy if each were held 2m above the ground? The 20 pound weight
At which point would a roller coaster possess the greatest amount of potential energy? The top of the build up ramp.
IN ONE WORD, why will a rolling ball eventually come to a stop on its own? Friction
When my velocity triples, my kinetic energy increases by ______ times. 9
True or false: the net work done on a body is equal to its change in kinetic energy. True
What type of simple machine is a ramp? Inclined Plane
Which type of simple machine drives objects apart? Wedge
Which simple machine is used to reduce friction of moving something? Wheel and Axel
Which type of simple machine is a see-saw? Lever
Which type of simple machine changes the direction of a force? Pulley
Which type of simple machine is a wheel wrapped around a pole? Wheel and Axle
What can a simple machine do? Allows the users to apply less force over a longer distance, reduce the amount of force needed to do work, change the direction of the applied force
An inclined plane wrapped around a rod forms this simple machine. Screw
A simple machine that consists a rigid bar that pivot about a fixed point is a: Lever
The fixed point on the lever is called a: Fulcrum
What is the first law of thermodynamics? Energy cannot be created or destroyed
What is the second law of thermodynamics? In all energy exchanges, if no energy enters or leaves the system, the potential energy of the state will always be less than that of the initial state. Or entropy
Created by: MKStudy
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