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WorksheetsWork Power Energy
Total questions: 33
Worksheet time: 1hrs 20mins
How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 1 minute?
900 J
450 J
0 J
-900 J
45 J of work were done on the object that moved 5 meters. How much force was applied to the object?
8 N
225 N
9 N
0 N
A 10.0 kg box is accelerated from 2.0 m/s to 4.0 m/s. What is the amount of work needed to accelerate the box?
50 J
60 J
20 J
45 J
Calculate the force necessary to move a 1000 kg car from rest to 25 m/s in 100 m.
250 N
125 N
3125 N
3250 N
If there is no friction on this track, at which point would the coaster have the most kinetic energy?
A
B
C
D
Where is the roller coaster gaining potential energy?
A to B
B to C
C to D
The roller coaster is always losing potential energy
A block starts at rest at point P at the top of a ramp which is height h above the ground. The block slides down one side and up the other, stopping at a point less than h above the ground.
The block did not go as high on the other side because gravity pulls down.
The block did not go as high on the other side because potential energy always has to decrease.
The block did not go as high on the other side because work from friction made the mechanical energy less.
The situation as described is impossible to happen.
A light plastic cart and a heavy steel cart are both pushed with the same force for a distance of 1.0 m, starting from rest. After the force is removed, the kinetic energy of the light plastic cart is ________ that of the heavy steel cart.
greater than
equal to
less than
can't say unless we know how big the force is
Starting from rest, a marble first rolls down a steeper hill, then down a less steep hill of the same height. Ignoring friction, for which is it going faster at the bottom?
Faster at the bottom of the steeper hill
Faster at the bottom of the less steep hill
Same speed at the bottom of both hills
Can’t say without knowing the mass of the marble
Which requires more power – a person walking up stairs or a person running up stairs?
walking
running
they require equal power output
no power is required at all
A box of mass m is pulled by a force F, which makes an angle 𝜙 with the horizontal. A frictional force f is applied on the box as it slides on a horizontal surface, as shown in the figure below. Which of the following represents the net work on the box when it covers a distance d?
𝐹𝑑
(𝐹 − 𝑓)𝑑
𝐹 cos 𝜙 𝑑
(𝐹 cos 𝜙 − 𝑓)𝑑
(𝐹 sin𝜙 − 𝑓)𝑑
A 10 𝑘𝑔 block is released from rest at the top of an inclined plane of height h = 2m, as shown in the figure below. The coefficient of kinetic friction between the block and the surface of the incline is 0.2. What's the work done by the normal force?
-350 J
-200 J
0 J
200 J
350 J
The velocity of a 2.00 kg object, which starts
moving from rest, is given by the equation:
𝑣 = 4.00𝑡2 + 7.00𝑡
Find the net work done on the object between
t = 0.00 s and t = 2.00 s.
0 𝐽
30 J
1800 J
900 J
121 J
A car travels at a constant speed v up a hill from point A to point B. As the car travels from A to B, its gravitational potential energy
increases and its kinetic energy remains the same
remains the same and its kinetic energy decreases
increases and its kinetic energy decreases
remaines the same and its kinetic energy remains the same.
Two objects, one of mass m and the other of mass 2m, are dropped from the top of a building. If there is no air resistance, when they hit the ground _______.
the heavier one will have half the kinetic energy of the lighter one
the heavier one will have twice the kinetic energy of the lighter one
the heavier one will have equal kinetic energy as the lighter one
the heavier one will have four times the kinetic energy of the lighter one
Work done by the sun in moving Earth in an orbit around it is an example of
positive work
negative work
zero work
none of the above
Bobby lifts a book to the second floor in 20 seconds. Carol lifts the same book to the second floor in 10 seconds. Who did more work?
Bobby
Carol
They did the same amount of work
Not enough information
Bobby lifts a book to the second floor in 20 seconds. Carol lifts the same book to the second floor in 10 seconds. Who applied more power?
Bobby
Carol
They did the same amount of work
Not enough information
What is the total mechanical energy of the object?
100J
75J
50J
25J
A girl weighs 400 N. She runs up a flight of stairs of height 5 m in 4 seconds. Her power is:
320 W
400 W
500 W
2 000 W
If a system is isolated, the total energy of the system
Increases constantly.
Decreases constantly.
Is constant.
Each of the boxes shown is pulled for 10 m across a level, frictionless floor by the force given. Which box experiences the greatest change in its kinetic energy?
A
B
C
D
E
Which ball has the least kinetic energy?
A
B
C
all the same
In each system, two balls have kinetic energy. Which system has the greatest total kinetic energy?
A
B
C
D
The work-energy theorem defines the relationship of the net work on an object and the change in the kinetic energy of the object.
Based on the the work-energy theorem, if the net work on an object is more than 0 J, the kinetic energy of the system will...
Increase
Decrease
Remain Constant
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 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
An object at rest may also have...
Speed
Velocity
Momentum
Kinetic Energy
Potential Energy
