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20 questions
In which of the following scenarios is work being done, according to the physics definition?
Solving an equation
lifting up a book
holding a barbell above your head
keeping a bike from falling as it rolls along a sidewalk
The "power" of a machine measures...
The work it does
The force it produces
The rate of doing work
Its strength
An object lifted 10m gains 200 J of potential energy. If the same object is lifted 20m, its potential energy gain is...
Half as much
The same
Twice as much
Four times as much
More than 4 times as much
It takes 60 J of work to push a large box 6 m across a floor. Assuming the push is in the same direction as the displacement, what is the magnitude of the force on the box?
6 N
10 N
60 N
360 N
None of these
If you do work on an object in one third of the usual time, your power output is...
One third of the usual power output
The same as the usual power output
Three times the usual power output
Impossible to predict
A 5 kg mass has 100 J of potential energy with respect to the ground. Approximately how high above the ground is the mass?
1 m
2 m
3 m
4 m
None of these
A bow is drawn so that it has 40 J of potential energy. When released, the arrow will theoretically have a kinetic energy that is
less than 40 J
More than 40 J
40 J
Impossible to predict
If you do 200 J of work in 10 seconds, your power output is...
2000 W
200 W
20 W
2 W
An object at rest may also have...
Speed
Velocity
Momentum
Kinetic Energy
Potential Energy
Mrs. Steward carries a 50 N cat 10 m across a room. Her arms exert an upward force on the cat equal to its weight. How much work is Mrs. Steward doing on the cat?
500 N
50 N
5 N
0 N
None of the above
When a car breaks to a stop, all its kinetic energy is converted to...
Stopping Energy
Potential Energy
Chemical Energy
Heat through friction
Nuclear Energy
A ball rolling down an incline plane has its maximum potential energy at...
The top
A quarter of the way down
Half way down
The bottom
Impossible to predict
A car moves 3 times as fast as another car. Compared to the slower car, the faster car has...
3 times the kinetic energy
6 times the kinetic energy
9 times the kinetic energy
12 times the kinetic energy
A shopping cart has a mass of 40 kg is pushed 10 m with a force of 20 N. How much work is done on the cart?
200 J
400 J
800 J
8000 J
A block of ice sliding down an incline has its maximum kinetic energy at...
the top
the bottom
halfway down
impossible to predict
How can you increase the power output of a machine?
Increase the work done
Increase the force with which the work is done
Decrease the time in which the work is done
All of the above
If you push an object a given distance, while applying four times the force, you do...
Twice as much work
Four times as much work
Half as much work
The same amount of work
A 10 kg ball has a height of 2 m, while a 5 kg ball has a height of 5 m. Which ball has more potential energy?
The 5 kg ball
The 10 kg ball
They both have the same potential energy
impossible to predict
Which quantity has the greatest influence on the amount of kinetic energy a large truck has while moving down the highway?
It's mass
It's weight
It's velocity
It's size
None of the above
How much power is required to raise a 30 kg crate a vertical distance of 6 m in a time of 4 seconds?
120 W
52.5 W
450 W
385 W
525 W
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