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WorksheetsPhysics - Unit #7.1 Energy
Total questions: 33
Worksheet time: 28mins
Changes in an object's motion depend on:
how long the force acts
force
force and how long
the force acts
How long means: (a)
The quantity (force x time) means: (a)
How long not always mean time, it can mean (a) also.
Is the effort exerted on something that will change is energy.
(a)
When we lift a load of gravel against Earth's gravity, we do (a) .
The heavier the load or the higher we lift the load, the _____ work we do.
less
neutral
more
Two things enter the picture whenever work is done:
In an object's motion depend on both, on how long the force acts and force.
The heavier the load or the higher we lift the load, the more work we do.
The application of the force and the movement of something by that force.
Work is the product of only the component of force that acts in the __________ and _________.
direction of motion
direction of motion distance moved
none of the above
distance moved.
If a force acts at an angle to the motion, the component of force parallel to the motion is multiplied by the distance moved.
false
true
none of the above
When a force acts at right angles to the direction of motion, with no force component in the direction of motion more work is done.
false
true
none of the above
When a force acts at right angles to the direction of motion, with no force component in the direction of motion no work is done.
false
true
none of the above
Twice the power means the engine can do twice the work in the same time or do the same amount of work in half the time.
false
true
none of the above
A satellite in a circular orbit, the force of gravity is at right angles
to its circular path and no work is done on the satellite. It orbits with no change in speed.
false
true
none of the above
If we lift two loads of gravel one story up, we do ______ as much work as if we lift one load the same distance because the force needed to ______ the weight is twice as much. (one work for both blanks)
(a)
If we lift a load two stories instead of one story, we do twice as much work because the (a) is twice as great.
You do work on something when you force it to move against the influence of an opposing force, which is called (a)
Work is related to force, how long, friction and also the other category of work done to change the (a) of an object.
Write the formula of work as a math expression.
(a)
Which are the units of work?
(a)
Which are the units force?
(a)
Which are the units distance?
(a)
The unit of work is the newton-meter, also called the (a) ?
For larger values of work done, we speak of (a) .
To stop a loaded truck in its tracks when it is moving at 100 km/h takes (a) of work.
Is the amount of work done per time it takes to do it.
(a)
The measure about of how fast the work is done.
(a)
A high power engine does work ________.
rapidly
slowly
Another way to look power; a liter of fuel can do a certain amount of work, but the power produced when we burn the fuel can be any amount, depending on how (a) it is burned.
The unit of power is the joule per second (J/s), also known as the (a) .
It may be in the form of a compression of atoms in the material of an object, a physical separation of attracting bodies, or a rearrangement of electric charges in the molecules of a substance. Something that enables an object in the material of an object to do work.
(a)
The energy due to the position of something and the movement of something.
(a)
_______ _________ can be in the form of potential energy, kinetic energy or the sum of the two.
(a)
