WorksheetsWork and Power
Total questions: 15
Worksheet time: 14mins
Name
Class
Date
1.
Work is defined as
a)
F x d
b)
Change in Energy
c)
Power / time
d)
A and B
2.
Power is defined as
a)
work
b)
energy used /time
c)
energy used
d)
work X time
3.
Work is being done when a force
a)
acts vertically on a cart that can only move horizontally
b)
is exerted by one team in a tug of war when no movement occurs
c)
is exerted while pulling a wagon uphill
d)
of gravitational attraction acts on a person standing on the Earth's surface.
4.
How much work is done on a downhill skier by an average force of 9.8 x 102 N to stop her in a distance of 10 meters?
a)
10 J
b)
1000 J
c)
980 J
d)
9800 J
5.
A motor having a maximum power rating of 8.1 x 104 Watts is used to operate an elevator. What is the maximum weight this motor can lift at an average speed of 3.0 m/s?
a)
6.0 x 103 N
b)
2.4 x 104 N
c)
1.8 x 104 N
d)
2.7 x 104 N
6.
Which action would require no work to be done?
a)
Lifting an object from floor to ceiling
b)
Pushing an object a long a horizontal floor
c)
decreasing the speed of an object until it comes to rest
d)
holding an object stationary above the ground
7.
How much work is required to lift a 2 kilogram object to a height of 10 meters?
a)
200 J
b)
100 J
c)
20 J
d)
5 J
8.
A garden tractor drags a plow with a force of 500 N a distance of 10 m in 20 seconds. How much work is done AND how much power is needed?
a)
5000 J and 100,000 Watts
b)
5000 J and 250 Watts
c)
50 J and 2.5 Watts
d)
1000 J and 50 watts
9.
A machine is able to do 30 J of work in 6.0 secs, the power developed by the machine is
a)
.2 Watts
b)
.5 Watts
c)
5.0 watts
d)
180 watts
10.
Car "A" and car "B" of equal mass travel up a hill. Car "A" moves with a constant speed that is twice that of car "B". Compare the power of car "A" to car "B".
a)
They are the same
b)
"A" is 1/2 as much as "B"
c)
"A" is 4 x the power of "B"
d)
"A" is twice the power as "B"
11.
Power can be defined as
a)
F x v
b)
F / v
c)
Fd x v
d)
W X F
12.
How much work is done on a 2.0 kg object to complete two revolutions around a 1.5 m radius circle?
a)
3 J
b)
1.33 J
c)
2(3.14) x 2kg J
d)
0 J
13.
How fast can a 3 kg object move upward if power of 500 Watts is used to lift it?
a)
1500 m/s
b)
17 m/s
c)
153 m/s
d)
167 m/s
14.
a 20 N block is dragged up a ramp (4 m base and 5 m hypotenuse), how much work is done?
a)
80 J
b)
100 J
c)
588 J
d)
60 J
15.
An 2 kg object is moving at 25 m/s. How much power mis required for this action?
a)
50 Watts
b)
490 Watts
c)
12.5 Watts
d)
122.5 Watts
100 %
