Worksheets6th weeks assessment reteach Energy, Forces
Total questions: 48
Worksheet time: 24mins
Explain how one of these forces acts on an object in a real-world scenario.
Gravity acts on a falling apple by pulling it toward the ground.
Friction pushes a boat forward in water.
Magnetism causes a balloon to float in the air.
Electricity makes a stone fall faster than gravity.
If a box is pushed to the right with 10 N and to the left with 4 N, what is the net force and is it balanced or unbalanced?
Net force is 6 N to the right; the forces are unbalanced.
Net force is 14 N to the right; the forces are balanced.
Net force is 6 N to the left; the forces are unbalanced.
Net force is 4 N to the right; the forces are balanced.
When you jump off a boat, the boat moves backward. This is an example of Newton's Third Law. What are the force pairs involved?
The force you exert on the boat and the force the boat exerts on you are equal and opposite.
The force of gravity and the force of friction between the boat and water.
The force of wind pushing the boat and the force of water resistance.
The force of your muscles and the force of the boat's engine.
Gravitational potential energy is stored due to an object's position, while kinetic energy is energy of _______.
motion
heat
sound
light
In a food web, energy is transferred from plants to animals. This is an example of energy _______.
transfer
loss
storage
creation
Sound travels through air as a _______ wave, while light travels as a _______ wave.
longitudinal; transverse
transverse; longitudinal
electromagnetic; mechanical
mechanical; electromagnetic
Identify and explain how forces act on objects, including gravity, friction, magnetism, applied forces, and normal forces, using real-world applications.
Gravity pulls objects toward the Earth, friction resists motion, magnetism attracts or repels, applied forces move objects, and normal forces support objects in contact.
Gravity pushes objects away from the Earth, friction speeds up motion, magnetism only attracts, applied forces stop objects, and normal forces pull objects downward.
Gravity only affects objects in space, friction only works on rough surfaces, magnetism only works with metals, applied forces are invisible, and normal forces do not exist.
Gravity makes objects float, friction causes objects to fly, magnetism only works underwater, applied forces are always equal to gravity, and normal forces are weaker than gravity.
What do magnets do?
Magnets attract some objects and repel others.
Magnets only attract all objects.
Magnets do nothing when brought near objects.
Magnets only repel all objects.
What happens when the magnets are far apart?
The force between them becomes weaker.
The force between them becomes stronger.
They start to attract more strongly.
They begin to rotate rapidly.
What happens when magnets are close together?
They attract each other.
They move apart rapidly.
They remain unchanged.
They disappear.
When the opposite poles on a magnet face each other, what happens?
They attract each other.
They repel each other.
They remain unchanged.
They lose their magnetism.
What happens when the same poles on a magnet face each other?
They repel each other.
They attract each other.
They merge together.
They remain neutral.
Discuss all the forces acting on the paper clip when you use a magnet to drag it across the table.
Magnetic force, friction, and gravity, and normal force
Only magnetic force
Only gravity and friction
Magnetic force and air resistance
The table provides definitions for four kinds of forces. Force 1: Non-contact force that pulls objects toward each other; affected by mass and distance Force 2: Contact force two surfaces exert when they push or rub against each other; affected by the type of surfaces involved and how hard they are pushed Force 3: Non-contact force that can be either a push or a pull; direction is dependent on orientation and strength of an object Force 4: Force exerted on an object by a person or another object Which option matches each force with its correct position in the table?
A. 1: Gravity; 2: Friction; 3: Applied Forces; 4: Magnetism
B. 1: Magnetism; 2: Gravity; 3: Applied Forces; 4: Friction
C. 1: Gravity; 2: Friction; 3: Magnetism; 4: Applied Forces
D. 1: Applied Forces; 2: Friction; 3: Gravity; 4: Magnetism
The name of Force 1 is _________.
Gravity
Magnetism
Friction
Electricity
The name of Force 2 is _________.
Friction
Gravity
Magnetism
Tension
The name of Force 3 is _________.
Magnetism
Gravity
Friction
Electrostatic
The name of Force 4 is _________.
Applied Forces
Frictional Forces
Magnetic Forces
Gravitational Forces
Look at the diagram.
Three bar magnets, each with opposing poles, are placed near each other in a straight line. Which of the following best explains how the magnetic force between the magnets could make them move, and what variables can change the strength of this force?
The magnetic force can cause the magnets to attract or repel each other, and the strength depends on the distance between them and the strength of their magnetic fields.
The magnetic force only causes the magnets to rotate, and the strength depends only on the color of the magnets.
The magnetic force can make the magnets move closer together, and the strength depends only on the temperature of the room.
The magnetic force has no effect on the magnets, and the strength depends on the shape of the magnets.
A metal paper clip lying still on a desk is acted on by multiple forces. When a magnet is brought close to the paper clip, it moves toward the magnet.
Friction between the desk and paper clip causes it to stay still before the magnet acts upon it.
Magnetic force between the paper clip and magnet causes the paper clip to be pulled toward the magnet without the need for contact.
Normal contact force between the desk and paper clip before the paper clip is acted on by the magnet.
Gravitational force pulls the paper clip down toward the Earth as it rests on the desk due to its great mass.
1. Keeps objects down.
2. Force caused by a person or another object
3. Keeps things from falling through surfaces
4. Can pull or push based on orientation of the poles
1: Magnetism; 2: Normal; 3: Gravity; 4: Friction; 5: Applied
1: Gravity; 2: Applied; 3: Friction; 4: Normal; 5: Magnetism
1: Applied; 2: Friction; 3: Normal; 4: Magnetism; 5: Gravity
1: Friction; 2: Magnetism; 3: Applied; 4: Gravity; 5: Normal
Choose the change(s) that can affect the strength or direction of the magnetic force between the magnets in the diagram. Select all correct answers.
Orientation of magnets
Strength of magnets
Distance between magnets
Mass of the magnets
Identify and explain what forces are at work as the student attempts to pull themselves up the rope. Select all such forces.
Earth’s gravitational force is applied downward on the student.
Applied forces act on both the student and the rope during contact.
Normal force is exerted by the rope on the student equal and opposite to the applied force.
Applied force is exerted by the student on the rope in the attempt to pull themselves up.
Identify the true statement(s) about the force that occurs between our planet and the moon that keeps the moon in orbit. Select all that apply.
Gravity is an attractive-only force that pulls objects towards other objects.
Magnetism between Earth and the moon is possible due to the composition of metals within Earth’s core.
Friction is a contact or non-contact force that increases in strength as distance decreases.
The greater the mass of an object, the greater the force of its gravity on other objects.
According to NASA, our moon moves approximately one inch away from Earth each year. If this pattern continues, how could the increased distance affect the strength of the force between Earth and the moon?
As distance increases, the strength of the force would increase.
As distance increases, the strength of the force would weaken.
The strength of the force would increase and decrease due to other factors.
The strength of the force would not change, because it is not dependent on distance.
The cork is (less dense / more dense) than the water.
less dense
more dense
equally dense
not dense
Connect to Matter and Energy: A group of students at Station 1 placed a cork in one beaker of water and an iron ball into the other. They observed that the cork floats in the water, and the iron ball sinks. Compare the density of these materials by selecting the correct answer to complete the sentence. The iron ball is (less dense / more dense) than the water.
more dense
less dense
equally dense
not dense
Compare the density of these materials. The cork is (less dense / more dense) than the iron ball.
less dense
more dense
equally dense
not dense
Connect to Force, Motion, and Energy: The water in both beakers at Station 1 exerts a normal force in an upward direction. In terms of forces, which answer choices explain what the students observed, accounting for the behavior of the iron ball and the cork? Select two answers.
The force of gravity on the cork was greater than the normal force of the water acting against it.
The force of gravity acting on the iron ball was greater than the normal force of the water acting against it.
The normal force of the water acting on the cork was greater than the force of gravity acting on the cork.
The normal force of the water acting on the iron ball was greater than the force of gravity acting on the rock.
Gravitational, elastic, and chemical potential energies are all forms of potential energy, while kinetic energy is:
a form of energy due to motion
a type of stored energy
energy related to position
energy that cannot be converted
A book sits on the edge of a table. Which statement BEST describes the energy of the book?
The book has more kinetic energy than gravitational potential energy.
The book has kinetic energy that can be transformed into gravitational potential energy.
The book has gravitational potential energy that can be transformed into kinetic energy.
The book has neither kinetic energy nor gravitational potential energy.
Jen pushes the swing in the same direction as its current motion. Explain how the energy of the push would be transferred.
Energy from the push would be transferred from Jen to the swing, increasing its motion.
Energy from the push would be transferred from the swing to the person behind the swing, decreasing its motion.
Energy from the push would be transferred from the swing to the person behind the swing, increasing its motion.
Energy from the push would be transferred from the person behind the swing to the swing, decreasing its motion.
A student wants to try out her new toy race car. She sets up a smooth wooden ramp and lets the car roll down the ramp without applying additional force. Part A The student increases the angle of the ramp. How would this affect the force on the race car?
The force on the race car would increase.
The force on the race car would decrease.
The force on the race car would not change.
The race car would not be able to start down the ramp.
A student wants to try out her new toy race car. She sets up a smooth wooden ramp and lets the car roll down the ramp without applying additional force. The student decides to test how a change in frictional force affects the car’s motion. She uses the same ramp angle from the first trial, but she lines the ramp with sandpaper to make the ramp rougher in texture. How would this affect the force needed to move the race car down the ramp?
Less force is needed to move the car down the ramp.
Greater force is needed to move the car down the ramp.
Frictional force increases the gravitational force on the car.
The texture of the ramp would not have an effect on the force needed to move the car down the ramp.
Jen and Luis take turns pushing each other on the swings at a park. Luis sits in the stationary swing and Jen pushes Luis forward from behind. Explain how this push would change the pattern of Luis' motion on the swing.
Since the forces on the swing are unequal, the push would increase the swing's forward momentum.
Since the forces on the swing are unequal, the push would decrease the swing's forward momentum.
Since the forces on the swing are equal, the push would increase the swing's forward momentum.
Since the forces on the swing are equal, the push would decrease the swing's forward momentum.
Jen and Luis take turns pushing each other on the swings at a park. After Luis has been swinging for a while, Jen pulls the swing backward with the same force as its motion forward. Explain how this would change the pattern of Luis' motion.
Since the forces on the swing are equal and in the same direction, the momentum of the swing would increase in that direction.
Since the forces on the swing are equal and opposite, the motion of the swing would stop.
Since the forces on the swing are unequal and in the same direction, the momentum of the swing would increase in that direction.
Since the forces on the swing are unequal and opposite, the momentum of the swing would move in the direction of the greater force.
Analyze: Car races occur throughout the year at the Circuit of the Americas track in Austin, TX. How do you know that energy is conserved when these cars race?
Energy is created as the cars move more quickly.
Energy is created when the cars speed up and destroyed when they slow down.
Energy is transferred from the racing fuel to the car as it speeds up.
Energy is only transferred and transformed, not created or destroyed.
The student could have transformed the elastic potential energy in the stretched rubber band into kinetic energy by:
letting go of the stretched rubber band so it snaps back
keeping the rubber band stretched without releasing it
placing the rubber band in water
painting the rubber band with a color
The ball is rolling downwards with 25 N Calculate the horizontal net force acting on the ball if the force of friction is 2 N.
20 N
2 N
23 N
10 N
Explain how replacing the fan with a light bulb changes energy transformations within the circuit.
Replacing the fan with a light bulb changes the energy transformation from electrical to light energy.
Replacing the fan with a light bulb changes the energy transformation from electrical to sound energy.
Replacing the fan with a light bulb changes the energy transformation from electrical to chemical energy.
Replacing the fan with a light bulb changes the energy transformation from electrical to mechanical energy.
Connect to Force, Motion, and Energy: Students at Station 5 observed the long springs at the station. One student picked up a spring, compressed it, and then let it go. The spring bounced until it came to rest on the ground. Use the table to label the forms of energy involved in the student’s manipulation of the spring. You may name more than one form of energy involved in each row of the table. Position of the spring: Static (at rest) on the table. Which of the following best describes the form(s) of energy present when the spring is static (at rest) on the table?
No energy (or gravitational potential energy, if considering its position above ground)
Kinetic energy and sound energy
Elastic potential energy and thermal energy
Electrical energy and light energy
Connect to Force, Motion, and Energy: Students at Station 5 observed the long springs at the station. One student picked up a spring, compressed it, and then let it go. The spring bounced until it came to rest on the ground. Use the table to label the forms of energy involved in the student’s manipulation of the spring. You may name more than one form of energy involved in each row of the table. Position of the spring: Compressed
Elastic potential energy
Kinetic energy
Thermal energy
Gravitational potential energy
Connect to Force, Motion, and Energy: Students at Station 5 observed the long springs at the station. One student picked up a spring, compressed it, and then let it go. The spring bounced until it came to rest on the ground. Use the table to label the forms of energy involved in the student’s manipulation of the spring. You may name more than one form of energy involved in each row of the table.
Position of the spring: Bouncing
Form(s) of energy involved: ________
Kinetic energy and elastic potential energy
Thermal energy and sound energy
Gravitational potential energy and chemical energy
Electrical energy and nuclear energy
A person shoots an arrow. The first image shows before the arrow is shot. The second image shows after the arrow is shot. Which location in the diagram does the bow have elastic potential energy and which location does the arrow have kinetic energy?
Elastic potential energy: C; Kinetic energy: B
Elastic potential energy: A; Kinetic energy: D
Elastic potential energy: B; Kinetic energy: C
Elastic potential energy: D; Kinetic energy: A
Energy is transformed from the battery to the fan within the circuit by:
The battery provides electrical energy, which is converted by the fan into mechanical energy.
The battery provides mechanical energy, which is converted by the fan into electrical energy.
The fan generates energy that is stored in the battery.
The wires convert mechanical energy from the battery into heat energy for the fan.
Look at this image of two battery-operated toy cars that were built by students. One car has one battery and the other car has two batteries. Which of the following statements is true about the distance the two cars will travel?
The car with two batteries will travel farther because it has more mass, so it resists change in speed.
The car with two batteries will travel farther because it has more mass and more chemical energy to transform into more kinetic energy.
The car with one battery will travel farther because it has less mass, so the chemical energy can be transformed into more kinetic energy.
The car with one battery will travel farther because the chemical energy can be transformed into more speed.
How can you describe energy in the flashlight when the switch is closed?
Closing the switch allows electrical energy to transfer through the wire.
Closing the switch allows electrical energy to transform through the wire.
Closing the switch allows chemical potential energy in the battery to transfer into electrical energy, which then transforms into light energy.
Closing the switch allows chemical potential energy in the battery to transform into electrical energy, which then transforms into light energy.
You drop a tennis ball to the ground and it bounces back to your hand. When is the elastic energy in the ball that greatest?
When the ball is released
Just before the ball hits the ground
Just before the ball starts to bounce upward
When the ball returns to your hand
