WorksheetsPower, Force and Work
Total questions: 25
Worksheet time: 13mins
Name
Class
Date
1.
A boy is riding a skateboard. Why does the skateboard have the ability to do work?
a)
because the force applied by the rider acts in the same direction as the skateboard
b)
because it can slow down
c)
because the force applied by the rider acts in the opposite direction of the skate board
d)
because it can change direction
2.
Consider the following two situations:
1. a girl kicks a ball across a field
2. A boy holds a suitcase by his side.
which of the following responses is correct about the two situations.
1. a girl kicks a ball across a field
2. A boy holds a suitcase by his side.
which of the following responses is correct about the two situations.
a)
Work is done in both situation.
b)
No work is done in either situation.
c)
Work is done in the first situation, but not the second.
d)
work is done in the second situation, but not the first.
3.
Which of the following best defines energy?
a)
the ability to do work
b)
the resistance to motion
c)
how fast an object moves
d)
amount of force in a given time
4.
Which of the following has elastic potential energy?
a)
A stretched rubberband.
b)
A laboratory burner is used to heat 250 mL of water to boiling.
c)
A woman pushes a luggage cart in an airport over a distance of 100 m.
d)
A man pushes on a large piece of furniture for 15 min, but it does not move.
5.
A lightbulb uses 2,000 J of energy in 1 minute and 20 seconds. What is the power of the light bulb?
a)
25 W
b)
50 W
c)
60 W
d)
100 W
6.
Four movers pushed different boxes across a floor for the same distance. The table shows how much force each mover used, the time it took to move the box, and the mass of the box. Who did the least work?
a)
Jayden
b)
Akira
c)
Hamid
d)
Maddie
7.
A girl uses 60 J of energy to move a box from the floor to a shelf. How much power does she use if it takes her 3 s to move the box?
a)
15 W
b)
20 W
c)
90 W
d)
180 W
8.
Energy is the ability to do work. In which of these examples does using energy cause work to be done?
a)
A girl kicks a ball across a field.
b)
A boy holds a suitcase by his side.
c)
A pitcher holds a ball in his glove.
d)
A woman reads instruction for assembling her bicycle.
9.
What term describes the energy that is stored due to the height of an object from the ground?
a)
gravitational potential energy
b)
kinetic energy
c)
chemical energy
d)
mechanical energy
10.
Which of the following has kinetic energy?
a)
a book sitting on a shelf
b)
hat and g;oves on a table
c)
a child kicking a soccer ball
d)
cars parked in a parking lot
11.
Three rocks are rolling down a hill at the same speed. Rock 1 has a mass of 1 kg; rock 2 has a mass of 1.5 kg, and rock 3 has a mass of 3 kg. Which rock has the most kinetic energy?
a)
rock 1
b)
rock 2
c)
rock 3
d)
all three rocks have the same kinetic energy
12.
How is mechanical energy calculated?
a)
by adding potential and kinetic energy
b)
by subtracting potential energy from kinetic energy
c)
by multiplying potential energy and kinetic energy
d)
by dividing potential energy by kinetic energy
13.
What is kinetic energy?
a)
energy of motion
b)
the sume of mechanical energy and potential energy
c)
stored energy due to position
d)
stored energy due to chemical composition
14.
The motion of a fish swimming in a fish tank is an example of which type of energy?
a)
kinetic energy
b)
chemical energy
c)
potential energy
d)
gravitational energy
15.
What is a machine?
a)
A device that absorbs excess work.
b)
A device that changes the way work is done.
c)
A device that increases the amount of work done.
d)
A device that decreases the amount of work done.
16.
The diagram below shows a lever. Which type of lever is shown in the diagram, and which label points to the fulcrum?
a)
first class, label A
b)
first class, label B
c)
third class, label B
d)
second class, label C
17.
A student uses a simple machine to help lift a load. When 40 N of input force is applied to the machine, it is able to lift 160 N. What is the mechanical advantage of the machine?
a)
3
b)
4
c)
40
d)
160
18.
How is the mechanical efficiency of a machine usually expressed?
a)
as a fraction
b)
as a percentage
c)
as inches or feet
d)
as one of three classes
19.
Machines change the way work is done. In what two ways can a machine accomplish this?
a)
by reducing the amount of overall work done
b)
by increasing the amount of overall work done
c)
by changing the height or mass of force
d)
by changing the size or direction of force
20.
What is the difference between input force and output force?
a)
Machines change the way work is done. In what two ways can a machine accomplish this?
b)
Input force is the force exerted on a machine, and output force is the force a machine exerts on an object.
c)
Input force is a measure of the machine’s efficiency, and output force is a measure of the mechanical advantage of the machine.
d)
Input force is a measure of the mechanical advantage of the machine, and output force is a measure of the machine’s efficiency.
21.
Input force is a measure of the mechanical advantage of the machine, and output force is a measure of the machine’s efficiency.
a)
The force applied to the rock is the input force, and the force applied by the person to the lever is the output force.
b)
The force applied by the person to the lever is the input force, and the force applied to the rock is the output force.
c)
The force applied to the fulcrum is the input force, and the force applied to the lever is the output force.
d)
The force applied to the rock is the input force, and the height of the rock is the output force.
22.
As you pull down on a pulley, the load attached to the pulley is lifted. How has the pulley changed the way work is done?
a)
It made the load lighter.
b)
It made the load heavier.
c)
It lifted the load more quickly.
d)
It changed the direction of the force.
23.
Screw 1 and screw 2 are identical in every way but the distance between their spiral treads. The treads are closer together on screw 1 and farther apart on screw 2. Which screw provides the greater mechanical advantage?
a)
screw 1, because the threads are closer
b)
screw 2, because the threads are farther apart
c)
Because both screws have spiral treads, they both have the same mechanical advantage.
d)
Because both screws are the same length, they both have the same mechanical advantage.
24.
The following table shows information about three different objects sitting on a bookshelf. Some data are missing from the table.
If object 3 has a gravitational potential energy of 196 J, what is its mass?
If object 3 has a gravitational potential energy of 196 J, what is its mass?
a)
10 kg
b)
196 J
c)
1.0 kg
d)
0.10 kg
25.
Which of the following has elastic potential energy?
a)
a vase sitting on a shelf
b)
a stretched rubber band
c)
a child moving down a slide
d)
sugars stored in the molecules of food
100 %
