WorksheetsWork and Energy
Total questions: 10
Worksheet time: 3hrs 30mins
What is the S.I unit of work?
N.m2
(Kg.m2) / s2
J/m
J
In which scenario is work = 0 J ?
Pushing a stationary wall
Pulling a trolley car
Pushing a book across the table
Dropping a set of keys from a height, h.
Power depends on force and speed.
True
False
The coefficient of kinetic friction between a large box and the floor is 0.21. A person pushes horizontally on the box with a force of 165 N for a distance of 2.8 m. If the mass of the box is 72 kg, what is the total work done on the box? (Round your answer to a whole number)
51
49
47
45
Work is zero if the force has a component in the direction opposite of motion.
True
False
A 3 kg plate is tossed across the room with an acceleration of 13 m/s2 in 2.5 sec. Calculate the amount of power it took to toss the plate.
290.5 W
1267.5 W
507 W
3000 W
An object weighing 20 N moves horizontally toward the right a distance of 5.0 m. What is the work done on the object by the force of gravity?
The work done on the object by the force of gravity is 50 J.
The work done on the object by the force of gravity is zero joules.
The work done on the object by the force of gravity is 4.0 J.
The work done on the object by the force of gravity is 0.25 J.
The work done on the object by the force of gravity is 100 J.
You pick up a 3.8 kg can of paint from the ground and lift it to a height of 1.4 m. You hold the can stationary for half a minute, waiting for a friend on a ladder to take it. How much work do you do during this time (when the can of paint was stationary)?
52 J
30 J
0 J
25 J
If the net work done on an object is positive, what can you conclude about the object's motion?
The object is speeding up.
The object is moving with a constant velocity.
The object is slowing down.
The object is at rest; its position is constant.
You raise a bucket of water from the bottom of a well that is 12 m deep. The mass of the bucket and the water is 5.00 kg, and it takes 15 s to raise the bucket to the top of the well. How much power is required?
39 W
41 W
43 W
45 W
