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WorksheetsEnergy, Work & Simple Machines
Total questions: 35
Worksheet time: 18mins
Name
Class
Date
1.
A force of 12 N is used to lift a box 0.5 meters above a floor. What amount of work was done to lift the box?
a)
6.0 N/m
b)
11.5 N
c)
12.5 N
d)
24.0 N/m
2.
How much work is done in moving the cart?
a)
20J
b)
500J
c)
1000 J
d)
2000 J
3.
How much power is required to lift a 2.0 kg object 5 meters in 4.50 seconds?
a)
0.45 Watts
b)
2.22 Watts
c)
21.8 Watts
d)
45.0 Watts
4.
The efficiency of a machine is always less than 100 percent because
a)
a machine cannot have an IMA greater than 1.
b)
some work input is lost to friction.
c)
the work input is too small.
d)
the work output is too great.
5.
If you know the input distance and output distance of a machine, which of the following can you calculate?
a)
work
b)
efficiency
c)
actual mechanical advantage
d)
ideal mechanical advantage
6.
An inclined plane reduces the effort force by
a)
increasing the distance through which the force is applied.
b)
increasing the work.
c)
reducing the effort distance.
d)
reducing the work.
7.
The ideal mechanical advantage of a pulley system is equal to the
a)
distance the load has to move.
b)
length of the rope.
c)
number of rope segments supporting the load.
d)
weight of the object being lifted.
8.
Which of the following is not a type of simple machine?
a)
screw
b)
wedge
c)
lever
d)
handle
9.
What does the power of a machine measure?
a)
The rate of doing work.
b)
The strength of the machine.
c)
The force the machine produces.
d)
The total amount of work completed.
10.
Which class of lever best describes the machine shown:
a)
1st Class
b)
2nd Class
c)
3rd Class
d)
4th Class
11.
The point labelled 3 on the above image could best be described as
a)
Effort
b)
Resistance
c)
Fulcrum
d)
Mechanical Advantage
12.
You use a 160 cm plank to lift a large rock. If the rock is 20 cm from the fulcrum, what is the plank's IMA?
a)
5
b)
6
c)
7
d)
8
13.
What is the mechanical advantage of the following pulley system?
a)
1
b)
2
c)
3
d)
4
14.
A boy pushes a lever down 2 meters with a force of 75 Newtons. The box the other end weighs 50 Newtons and moves up 2.5 meters. What is the efficiency of this machine?
a)
80.0%
b)
66.67%
c)
72%
d)
83.3%
15.
The motion of atoms and molecules in a substance is
a)
thermal energy.
b)
chemical energy
c)
mechanical energy.
d)
electromagnetic energy.
16.
How are the particles in a block of iron affected when the block is melted?
a)
The particles gain mass.
b)
The particles contain less energy.
c)
The particles move more rapidly.
d)
The particles increase in volume.
17.
Which of the following best describes what a thermometer measures?
a)
amount of heat energy contained in a substance
b)
average kinetic energy of a substance’s molecules
c)
rate of flow of heat from a substance to the environment
d)
the melting point and boiling point of a substance
18.
A glass of water left in the sun becomes warm. Estella adds ice to the water to make it cool. What energy change occurs when ice is added to the warm drink?
a)
The water loses heat to the ice, causing the ice to melt.
b)
The water absorbs the cold temperature from the ice.
c)
Since the ice is cold, it adds cold to the environment.
d)
The melting ice causes the water to expand, cooling it.
19.
Three fundamental states of matter are represented in the diagrams below. What is the order of the diagrams if arranged from low kinetic energy to high kinetic energy?
a)
I, II, III
b)
II, III, I
c)
II, I, III
d)
III, II, I
20.
A student poured 200 g of 80°C water into 200 g of 20°C water in a 500 mL insulated container and stirred the mixture. What final temperature should the students expect for the water mixture?
a)
30°C
b)
40°C
c)
50°C
d)
60°C
21.
José is investigating the relationship between energy and the motion of an object. José releases a ball onto a U-shaped ramp and observes the motion of the ball as it rolls back and forth between sides 1 and 2. Which explains the total energy of the ball on the ramp?
a)
The ball loses potential energy and absorbs thermal energy when rolling upward.
b)
The ball gains potential energy and absorbs thermal energy when rolling downward.
c)
The ball loses kinetic energy and gains potential energy when rolling upward.
d)
The ball loses kinetic energy and loses potential energy when rolling downward.
22.
The kinetic energies of particles in a sample of matter are increasing. This sample is most likely
a)
a liquid that is warming.
b)
a gas that is cooling.
c)
a liquid that is turning into a solid.
d)
a gas that is turning into a liquid.
23.
Paul observes four different samples of water. He records the temperature and volume of each sample. Which of his samples contains the greatest amount of thermal energy?
a)
100 ml of 10°C water
b)
100 ml of 25°C water
c)
5 liters of 10°C water
d)
5 liters of 25°C water
24.
Which of the water samples described below has the greatest average kinetic energy per molecule?
a)
1 liter of ice at a temperature of –50°C
b)
10 liters of ice at a temperature of –75°C
c)
1 liter of water at a temperature of 75°C
d)
10 liters of water at a temperature of 50°C
25.
Mark collected and graphed data on water temperature change over time. In what segment of his graph does the water have the lowest kinetic energy?
a)
1–2
b)
2–3
c)
3–4
d)
4–5
26.
Which sequence has the states of matter listed from least to greatest kinetic energy?
a)
solid → gas → liquid
b)
gas → liquid → solid
c)
liquid → solid → gas
d)
solid → liquid → gas
27.
Emily is riding her bicycle. Which best explains why only some of the energy used to pedal her bicycle is transferred into forward motion of the bicycle?
a)
The energy of the bicycle tire is applied in a circular motion.
b)
The energy of the bicycle is transferred to only one wheel.
c)
The gears and chain of the bicycle are covered with oil.
d)
The gears and chain of the bicycle generate friction.
28.
A bicyclist at the top of a hill begins to coast without pedaling. The bicycle speeds up as it descends to the bottom of the hill and then slows down as it continues up a second hill, where it stops. Which of these sequences best describes the energy change of the bicycle from the top of the hill until it stops?
a)
potential — kinetic — kinetic
b)
kinetic — potential — potential
c)
kinetic — potential — kinetic
d)
potential — kinetic — potential
29.
A basketball bounces on the gym floor nine times and finally comes to a rest. Which of these best explains why the basketball rises to a lower height each time it bounces?
a)
Gravity increases as the basketball bounces.
b)
The floor adds energy to the bouncing basketball.
c)
Energy is transferred from the basketball to the floor.
d)
The air inside the basketball is heavier than the surrounding air.
30.
When one form of energy is converted into other forms of energy, the total amount of energy
a)
varies throughout the conversion.
b)
increases because some energy is created.
c)
remains constant throughout the conversion.
d)
decreases because some energy is destroyed.
31.
How high does a 25 kg ball that is thrown at 10 m/s go into the air?
a)
9.8 m
b)
8.4 m
c)
19.2 m
d)
5.1 m
32.
What is the kinetic energy of a 3-kilogram ball that is rolling at 2 meters per second?
a)
2 J
b)
4 J
c)
6 J
d)
8 J
33.
A cinder block is sitting on a platform 20 m high. It weighs 79 N. How much potential energy does the cinder block have?
a)
1580J
b)
15484 J
c)
159833 J
d)
153 J
34.
The potential energy of an apple is 6.00 joules. The apple is 3.00-meters high. What is the mass of the apple?
a)
0.204 kg
b)
2kg
c)
24kg
d)
176 kg
35.
A forklift lifts 5 boxes from the ground to a height of 2 meters (m). The boxes push down with a force of 1000 Newtons (N). How much work was done by the forklift to lift the boxes?
a)
200J
b)
500J
c)
2000J
d)
10000J
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