Grove Science Midterm; Force and Work

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moving

An object that has kinetic energy must be...

false

T-F a machine can save time or work

false

T-F a watt is equal to equal to the amount of work that is accomplished when a force of one Newton moves an object a distance of one meter

false

T-F the effort arm of a lever is the part of the lever that resists the applied force

false

T-F you always get less out of a machine that you put in due to the force of gravity.

twice as much work

a 1000-kg car are hoisted the same distance in a gas station. Raising the more massive car requires...

40J

a bow is drawn so that it has 40J of potential energy. When fired, the arrow will ideally have a kinetic energy of...

power

a job is done slowly, while an identical job is done quickly. Both jobs require the same amount of work, but different amounts of...

second class lever

a lever in which the fulcrum and the effort are on opposite sides with the resistance located between the fulcrum and lever.

third class lever

a lever in which the fulcrum and the resistance are at opposite ends with the effort located between the fulcrum and resistance.

first class lever

a lever in which the resistance is at one end and and the effort at the other with the fulcrum somewhere between the two.

three parts

a lever is composed of how many parts?

at the opposite end of the resistance

in the third class lever, the fulcrum is located...

550 ft/Lbs

one horsepower is equal to how much work per second?

746 watts

one horsepower is equal to...

the work input must theoretically equal the work output

the Law of Machines states...

energy may not be created or destroyed but it can be changed from one form to another

the Law of the Conservation of Energy states...

energy

the ability to do work

effort

the applied force exerted to overcome the resistance

work

the exertion of a force through a distance to overcome motion

resistance

the force that must be overcome in doing work?

resistance

the force which must be overcome in doing work, or the opposition of a substance to the flow of electrons.

fulcrum

the point on which a lever is supported and free to rotate is called?

dependent on the mass of the barbell

the power expended when a barbell is raised 2.0 m in 2 s is...

work

the result of the exertion of a force through a distance is?

location

an object that has potential energy may have this energy because of its...

gain force, increase speed, increase distance, and change direction

first class levers may

gain, increase distance, and increase speed

first class levers may...

twice the usual power output

if you do work on an object in half the time, your pwer output is...

twice as much work

if you push an object twice as far while applying the same force, you do...

at all

if you push for an hour against a stationary wall, you do no work...

gravity, molecular attraction, and friction

what are types of resistance?

2nd class

what class lever is a wheelbarrow?

3rd class

what class lever is your arm?

work and time

what determines power?

lifting a bag of groceries

what is an example of work being done on an object?

1st class

what kind of lever is a small child's teeter-totter?

force and distance

what must work contain?

wedge

what type of machine is an axe blade?

heat

when a car is braked to a stop, its kinetic energy is transformed to...

twice as much

when an object is lifted 10 m, it gains a certain amount of potential energy. If the same object is lifted 20 m, its potential energy gain is...

force

when using a second-class lever what will you gain?

both require the same amount of work

which requires more work: lifting a 50-kg sack vertically 2 m or lifting a 25-kg sack vertically 4m?

Watt

who was the originator of the concept of horsepower?


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