WorksheetsQuizziz - Topic 3 - Energy - Savvas Elevate
Total questions: 81
Worksheet time: 55mins
Which of the following is an example of kinetic energy?
A stretched rubber band
A moving car
A battery
A book on a shelf
What is the main form of energy stored in food?
Electrical energy
Chemical energy
Thermal energy
Nuclear energy
Which method of energy transfer occurs through direct contact?
Radiation
Conduction
Convection
Reflection
What does the Law of Conservation of Energy state?
Energy can be created but not destroyed
Energy can be destroyed but not created
Energy cannot be created or destroyed, only transformed
Energy is always lost in a system
Which of the following is an example of potential energy?
A rolling ball
A compressed spring
A burning candle
A moving bicycle
What type of energy is involved when a toaster heats bread?
Chemical to electrical
Electrical to thermal
Mechanical to nuclear
Thermal to kinetic
Which of the following best describes an exothermic chemical reaction?
It absorbs energy from the surroundings
It releases energy to the surroundings
It does not involve energy change
It only involves light energy
What is the unit of energy in the International System of Units (SI)?
Watt
Joule
Newton
Calorie
Which energy transfer method does not require a medium?
Conduction
Convection
Radiation
Reflection
Which form of energy is stored in the nucleus of an atom?
Chemical energy
Nuclear energy
Electrical energy
Mechanical energy
A ball is dropped from a height. Describe what happens to its potential and kinetic energy as it falls.
Potential energy increases, kinetic energy decreases
Potential energy decreases, kinetic energy increases
Both potential and kinetic energy increase
Both potential and kinetic energy decrease
Which scenario best demonstrates the Law of Conservation of Energy?
A battery running out of charge and disappearing
A pendulum swinging back and forth, changing between kinetic and potential energy
A car using up all its fuel and stopping
A light bulb burning out and turning off
If you touch a metal spoon that has been sitting in a hot pot of soup, why does the spoon feel hot?
The spoon creates its own heat
Heat is transferred from the soup to the spoon by conduction
The spoon absorbs light energy
The spoon is a poor conductor
Which of the following best explains why a stretched rubber band has potential energy?
It is moving quickly
It has stored energy due to its position
It is producing heat
It is conducting electricity
A chemical reaction in a hand warmer releases heat. What type of reaction is this, and what energy change occurs?
Endothermic; chemical energy to thermal energy
Exothermic; chemical energy to thermal energy
Exothermic; thermal energy to chemical energy
Endothermic; thermal energy to chemical energy
A student places a metal rod with one end in hot water and the other in cold water. After a while, both ends are warm. Which energy transfer method is responsible?
Convection
Conduction
Radiation
Reflection
Which of the following best describes how energy is transferred in boiling water?
Conduction only
Convection currents move heat through the water
Radiation only
Reflection of heat
A ball at the top of a hill has 100 J of potential energy. If it rolls down and has 80 J of kinetic energy at the bottom, what happened to the missing 20 J?
It was destroyed
It was transformed into other forms, like heat and sound
It was stored as more potential energy
It was converted to light energy only
Which of the following is an example of energy transformation in a flashlight?
Electrical energy to light energy
Light energy to chemical energy
Mechanical energy to nuclear energy
Thermal energy to electrical energy
A student mixes two chemicals in a beaker and observes the temperature drops. What type of reaction is this, and what does it indicate about energy change?
Exothermic; energy is released
Endothermic; energy is absorbed
Exothermic; energy is absorbed
Endothermic; energy is released
A 2 kg object is lifted to a height of 5 meters. Calculate its gravitational potential energy. (Use g=9.8m/s2 )
10 J
49 J
98 J
100 J
A student claims that energy is lost when a ball stops rolling. Use the Law of Conservation of Energy to explain what actually happens to the energy.
The energy disappears completely
The energy is transformed into other forms, such as heat and sound
The energy is stored as potential energy
The energy is converted to light only
A 0.5 kg ball is moving at 4 m/s. What is its kinetic energy? (Use KE=21mv2 )
2 J
4 J
8 J
16 J
A student wants to increase the kinetic energy of a moving cart. Which of the following actions would be most effective?
Increase the mass of the cart
Decrease the speed of the cart
Increase the speed of the cart
Lower the cart to the ground
A student observes that a metal spoon left in a hot cup of tea becomes warm after a few minutes. Explain the process responsible for this observation.
The spoon generates its own heat
Heat is transferred from the tea to the spoon by conduction
The spoon absorbs light energy from the tea
The spoon is a poor conductor of heat
A student is designing an experiment to show energy conservation using a pendulum. What evidence should the student collect to support the Law of Conservation of Energy?
Measure the mass of the pendulum only
Record the height and speed of the pendulum at different points
Observe the color of the pendulum
Count the number of swings only
A roller coaster car starts at the top of a hill with 500 J of potential energy. At the bottom, it has 450 J of kinetic energy. Explain what happened to the missing 50 J, considering that energy cannot be created or destroyed.
It was destroyed
It was transformed into heat and sound due to friction, but the total energy remains the same
It was stored as more potential energy
It was converted to light energy only
A student mixes two chemicals and observes that the beaker feels cold. Using your knowledge of energy in chemical reactions, explain what happened, considering that energy cannot be created or destroyed.
The reaction released energy to the surroundings
The reaction absorbed energy from the surroundings, but the total energy is conserved
The reaction did not involve any energy change
The reaction produced light energy
A student wants to design a device that demonstrates all three methods of energy transfer: conduction, convection, and radiation. Briefly describe how the device could show each method, keeping in mind that energy cannot be created or destroyed.
Only conduction and convection can be shown
Use a metal rod (conduction), water heated in a pot (convection), and a lamp (radiation) to show energy transfer without creating or destroying energy
Use a fan for all three methods
Only radiation can be shown
A student observes that when a ball is thrown upward, it slows down, stops, and then falls back down. Using the concepts of kinetic and potential energy, explain what happens to the energy of the ball during its motion, considering that energy cannot be created or destroyed.
Kinetic energy is lost and not recovered
Kinetic energy is converted to potential energy as the ball rises, and potential energy is converted back to kinetic energy as it falls, with total energy conserved
Potential energy is destroyed at the top
Only kinetic energy is involved
What type of energy transformation occurs when using an electric pencil sharpener?
electrical to mechanical
sound to electrical
mechanical to electrical
potential to sound
What energy transformation occurs when a crock pot is plugged into an outlet and then the control knob is turned "on"?
thermal to electrical
mechanical to thermal
electrical to thermal
electrical to sound
What type of energy transformation happens in hydro-electric power?
kinetic to potential
sound to mechanical
chemical to electrical
mechanical to electrical
What type of energy is electrons flowing through a wire?
Electrical energy
Chemical energy
Kinetic energy
Mechanical energy
Which statement about heat is false?
Heat is energy
Heat is transferred from warmer objects to cooler objects
Cold objects contain heat
Heat is the same thing as temperature
If you touch an object and the object feels cold, what is happening?
The cold object is transferring its coldness to you
Your warmer body is transferring heat to the cooler object.
The cold object is taking warm matter from your body and becoming warmer.
Fuels are substances that....
make the earth cooler
gain energy when burned
release energy when burned.
create free energy
The law of conservation of matter...
old matter is destroyed and new matter is created
new matter is created in every reaction
matter cannot be created or destroyed
we should conserve all our matter
Burning reactions release energy in the form of
heat
heat and water
sound and light
heat and light
Two factors that determine work are...
Force
Mass
Velocity
Distance
Units of force are...
Newtons
Grams
Joules
Meters
Units of work are...
Newtons
Grams
Joules
Meters
If you push a cart with a force of 60 N for 2 m... how much work have you done?
120 J
30 J
120 N
30 N
What is the formula for work?
Force = work × distance
Distance = force × work
Work = force × distance
Work = force × mass
Fred kicks a ball with a force of 20N to George, who is 5M away.
How much work was done to the ball?
25 J
100 J
4 J
75 J
If 40N of force is applied to Rollo Koster's 10 kg cart over a distance of 50 meters, how much work is done?
8000 J
8000 N
4000 J
2000 J
Work is
having a job
movement
energy transfer
energy transfer to an object
What must happen for work to be done on an object?
The force must be applied in the opposite direction of the object's motion.
The object must be at rest.
The object must not move.
The object must move as the force is applied.
What unit is used to express power?
Newton
Joule
Watt
Meter per second
How can you increase power?
By increasing the amount of time
By keeping the amount of work and time constant
By decreasing the amount of work
By increasing the amount of work or decreasing the amount of time
What is required for work to occur?
A force causes an object to move in the direction of the force.
A force must be applied in a circular motion.
A force must be thought about.
An object must be painted.
What is power in terms of work done?
The distance of the work
The weight of the work
How fast work is done
The color of the work
What happens when you apply force but the object doesn't move?
Work is still done.
Energy is not transferred.
No work is done.
Power is increased.
If an electric motor uses 1500 Watts of power, how much work does it do in 10 seconds?
150 Joules
15000 Joules
15 Joules
1500 Joules
The formula for computing power is _____.
w x t
w / t
w + t
A 6kg cat misjudges a jump and falls 5 meters. How much gravitational potential energy does the cat have? (The cat is fine by the way.)
294 J
180000 J
1225 J
3920000 J
A 50kg (100lb) person is running at 7m/s (about 16 mph). How much kinetic energy do they have?
1225 J
180000 J
294 J
3920000 J
What is the formula for kinetic energy?
distance / time
mass x acceleration
velocity / time
½(mass) x (velocity)2
(mass) x (acceleration of gravity) x (height)
What is the formula for gravitational potential energy?
distance / time
mass x acceleration
velocity / time
½(mass) x (velocity)2
(mass) x (acceleration of gravity) x (height)
When the ball is falling down, the gravitational potential energy is transferred to .................................... energy.
potential
kinetic
elastic
chemical
What is potential energy?
The energy an object has due to its atomic structure.
The energy an object has due to its chemical composition.
The energy an object has due to its motion.
The energy an object has due to its position or condition.
What is kinetic energy?
The energy an object has due to its position or condition
The energy an object has due to its motion
The energy an object has due to its chemical composition
The energy an object has due to its atomic structure
When does an object have no kinetic energy?
When it's at rest.
When it's moving very slowly.
When the only force that's acting on it is gravity.
When it has no electrical charge.
Which object has the most potential energy?
A ball resting on the ground.
A ball being thrown at 100 miles per hour.
A ball on top of a refrigerator.
A ball resting on the edge of a cliff.
When does a yo-yo have the most potential energy?
When it's at its highest point.
When it's at its lowest point.
When it's moving between its highest and lowest points.
When it's moving at its top speed.
Four cars are positioned at the top of a hill. Which car has the most potential energy?
A
B
C
D
Why do objects at high elevations have more potential energy than objects at low elevations?
Because the thinner air at higher elevations means objects have a greater potential to move very fast
Because objects at high elevations are closer to the sun, which is the source of all energy on earth
Because objects at high elevations tend to move slower than objects at low elevations
Because gravity gives objects at high elevations the potential to fall much further
Match the following scenarios with the changes in potential energy of a spring.
It remains constant
A spring is compressed and held.
It converts to kinetic energy
A spring is released from a compressed state.
It increases
A spring is stretched beyond its natural length.
It decreases
A spring is stretched and then released.
