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WorksheetsU6P: Energy Storage and Transfer Model
Total questions: 121
Worksheet time: 6hrs 47mins
Kinetic energy pertains to...
motion
storage
mass
A motorcycle travels 25m/s and has a mass of 120kg. What is the kinetic energy of the motorcycle?
37,500J
3,000J
75,000J
What is the unit for work and energy?
Joule (J)
Power (P)
Watt (W)
What is the unit for power?
Joule (J)
Power (P)
Watt (W)
How much gravitational potential energy exists within a 2,500kg truck parked at the top of a 25m tall hill?
Use g = 10 s2m
625,000J
62,500J
1,562,500J
What are the component units of a joule?
kg⋅s2m2
kg⋅s2m
N⋅sm
What are the component units of a watt?
sJ
kg⋅s2m
P⋅s
How much elastic potential energy is stored within a spring that has a spring constant of 60N/m and has been stretched 1.2m?
43J
72J
50J
The Law of Conservation of Energy states that only in a closed system is all energy conserved. What is a closed system?
A system which does not allow the transfer of energy into or out of the system
A system where energy can freely flow into or out of the system
A system that has a constant input of energy from an outside source
What is the total mechanical energy of a 1,300kg car traveling 15m/s the moment it crests a 20m tall hill?
(Recall that ME = PE + KE; use g = 10 s2m )
406,250J
390,000J
146,250J
How much work does it take to push a box with 250N of force for 10m?
2,500J
25J
0.04J
How much work does it take for a 65kg track runner to increase their speed from 4m/s to 7m/s?
1,073J
1,820J
1,593J
How much power is needed for a light bulb to emit 8J of energy in 0.1 seconds?
80W
0.8W
0.013W
How much power does an 88kg person need to generate in order to run up a 6m tall staircase in 5 seconds?
5,174W
1,035W
3,268W
What is the formula for kinetic energy?
KE = 21mv
KE =21m2v
KE = 2 1mv2
KE = mv
How does potential energy differ from kinetic energy?
Potential energy is always greater than kinetic energy.
Potential energy is the energy of an object in motion.
Potential energy is stored energy based on position; kinetic energy is energy of motion.
Kinetic energy is stored energy based on position.
State the work-energy theorem in your own words.
The work done on an object equals the change in its kinetic energy.
Kinetic energy is always constant regardless of work done.
The work done on an object is equal to its mass times acceleration.
Work is the total energy of an object at rest.
Calculate the work done if a force of 10 N moves an object 5 m.
40 J
30 J
25 J
50 J
Explain the principle of conservation of energy.
Energy cannot be created or destroyed, only transformed; total energy in a closed system remains constant.
Energy can be created from nothing.
Total energy in a closed system can increase over time.
Energy is only lost during transformations.
If an object is lifted to a height, what type of energy does it gain?
Kinetic energy
Thermal energy
Potential energy
Chemical energy
What happens to the total mechanical energy in a closed system?
The total mechanical energy increases over time.
The total mechanical energy decreases due to friction.
The total mechanical energy is converted into thermal energy.
The total mechanical energy remains constant.
Define power in terms of work and time.
Power = Work - Time
Power = Work + Time
Power = Time / Work
Power = Work / Time
What is the relationship between work and energy?
Work is a form of energy storage.
Work is the same as energy.
Energy can be created from work.
Work is the transfer of energy.
How do you calculate the gravitational potential energy (Eg) of an object?
Eg = m * h / g
Eg = m * g * h
Eg = m + g + h
Eg = g * h / m
If a car accelerates from rest to a speed of 20 m/s, what happens to its kinetic energy?
The kinetic energy increases as the car accelerates to 20 m/s.
The kinetic energy remains constant throughout the acceleration.
The kinetic energy decreases as the car accelerates.
The kinetic energy becomes negative when reaching 20 m/s.
What is the significance of the work-energy theorem in physics?
It describes the relationship between temperature and pressure.
The work-energy theorem is significant because it connects work and energy, allowing for the analysis of motion and forces in a simplified way.
It explains the conservation of mass in chemical reactions.
It provides a method for calculating electrical resistance.
If an object has a mass of 2 kg and is moving at a speed of 3 m/s, what is its kinetic energy?
15 Joules
12 Joules
6 Joules
9 Joules
What is the relationship between work and energy?
Work is a form of energy storage.
Work is the same as energy.
Energy can be created from work.
Work is the transfer of energy.
What is a Joule?
The unit used for energy, equal to the work done when a force of one Newton acts over a distance of one metre.
A measure of power equivalent to one watt per second.
The amount of energy required to raise the temperature of one gram of water by one degree Celsius.
A unit of force equal to the mass of one kilogram multiplied by the acceleration of one meter per second squared.
What is Power?
The amount of energy stored in an object.
The rate at which energy is transferred or work is done, calculated by dividing work done by time taken.
The total energy consumed by a device over time.
The force applied to an object multiplied by the distance moved.
Calculate the power output of an engine that does 5000J of work in 10 seconds.
500 W
750 W
250 W
100 W
What is the potential energy of a 5kg object at a height of 10m?
Use g = 10 s2m
490J
500J
450J
480J
What is the difference between kinetic energy and potential energy?
Kinetic energy is the energy of motion, while potential energy is the energy stored due to an object's position.
Kinetic energy is the energy stored due to an object's position, while potential energy is the energy of motion.
Kinetic energy and potential energy are the same.
There is no difference between kinetic energy and potential energy.
What is the kinetic energy of a 1,677 kg object that is moving with a speed of 28 m/s?
750,698
698,782
254,147
657,384
Calculate the potential energy of a rock with a mass of 73 kg while sitting on a cliff that is 85 m high.
use g = 10 s2m
65,654
75,600
62,050
90,548
An engine reaches its top speed from rest in 5.26 s. It is able to perform 550,000 J of work in that time. How much power does this engine have at that time?
107,805.2
104,562.7
150,000
110,536.3
If 1,229 J of work is put into a machine and only 863 comes out as usable work. What is the efficiency of that machine?
85.5
70.2
25.3
78.2
A total of 750 J of work was done when a force of 125 N was exerted on a box to move it. How far was the box moved?
6m
600m
850m
90600m
A student moves a box across the floor by exerting 23.3 N of force and doing 47.2 J of work on the box. How far does the student move the box?
0.49m
2.03m
23.9m
1099.8m
A student exerts a force of 500 N pushing a box 10 m across the floor in 4 s. How much work does the student perform?
50 J
1,250 J
2,000J
5,000 J
Jackie used a portable electric drill to remove screws from a broken wooden table. He noticed that the screws holding the table together were warm to the touch after being removed from the wood. What explains this phenomenon?
Mechanical energy from the drill was converted into thermal energy due to friction.
Electrical energy from the drill was converted into chemical energy due to resistance.
Thermal energy from the drill was converted into mechanical energy due to inertia.
The process of removing the screw concentrated the thermal energy that was already present in the wood.
A man ran on a treadmill for 1,600 seconds. At the end of his run, the treadmill indicated his energy output as 240,000 J. What average power did he generate?
15 W
150 W
66 W
80 W
Which form of energy does a car's engine convert into mechanical energy?
light
wind
chemical
gravitational
The diagram below represents a diver's motion from the top of a high diving board into a pool of water. At which labeled point does the diver have the least potential energy?
1
2
3
4
A skateboarder travels from location 1 to location 4 as shown in the image below. At which location does the skateboarder have the most kinetic energy and the least potential energy?
1
2
3
4
How much power is used to lift a box that weighs 50 Newtons 10 meters in 10 seconds?
5 W
50 W
500 W
5,000 W
An object has a mass of 12.8 kg and a velocity of 8.4 m/s. What is the kinetic energy of the object?
53.8 J
107.5 J
451.6 J
903.2 J
The diagram below shows two bowling balls of equal mass. Ball A is resting near the edge of a shelf. Ball B is resting on the ground below. Which of these statements best describes the diagram?
Ball A has more kinetic energy than Ball B.
Ball B has more kinetic energy than Ball A.
Ball A has more potential energy than Ball B.
Ball B has more potential energy than Ball A.
Noah carried a skateboard up a hill and then rode the skateboard down the hill. When Noah reached the bottom of the hill, he rolled to a stop. When did Noah have the most potential energy?
while carrying the skateboard up the hill
while standing on the skateboard at the top of the hill
while riding the skateboard down the hill
while standing on the skateboard at the bottom of the hill
A rock climber weighs 550 N and is carrying a backpack that weighs 50 N. How much total work has been done after she climbs 12 m?
5500 J
6600 J
6000 J
7200 J
A 21.7-kg ball is located on a shelf 1.6 m above the ground. Which best describes the energy of the ball as it sits on the shelf?
All Its energy will be lost once it falls off the shelf.
Its energy depends only upon the speed the ball will travel.
It has mechanical energy in the form of gravitational potential energy.
It has mechanical energy in the form of kinetic energy.
Each of the following objects is placed on a different shelf. Which object has the greatest gravitational potential energy?
a 2-kg mass at 60-m height
a 5-kg mass at 5-m height
a 20-kg mass at 50-m height
a 40-kg mass at 2-m height
Kinetic energy is measured in...
This is the type of energy stored in a stretched bungee cord?
elastic energy
energy stretch
kinetic energy
gravitational energy
You drop a 5 kg ball from a height of 2 m. Just before it reaches the ground, energy is stored as ________.
Gravitational potential energy
Kinetic energy
Elastic energy
Thermal energy
You drop a 5 kg ball from a height of 2 m. Just before it reaches the ground, how much energy kinetic does it have?
10 J
98.1J
7 J
20 J
Friction causes energy to be transformed from kinetic energy to _________ energy.
gravitational
chemical
thermal
elastic
What energy storage mechanism is in a battery?
electrical
chemical
internal
elastic
At what position would a cyclist have the most energy kinetic?
A
B
D
F
If a student pulls on the bands of a slingshot with 5 N force for a distance of 0.25 m, how much energy is stored as elastic energy?
12.5 J
1.25 J
125 J
20 J
A bungee jumper falls off the platform and reaches the limit of stretch of the cord. Analyze this situation for a frictionless system that consists of the jumper, the earth, and the cord. At position A where is the energy stored?
kinetic
chemical
internal
gravity
A bungee jumper falls off the platform and reaches the limit of stretch of the cord. Analyze this situation for a frictionless system that consists of the jumper, the earth, and the cord. Where is the energy stored at position B?
Kinetic energy
Gravitational potential energy
Elastic energy
Chemical energy
Internal, thermal, or dissipated energy
A cart rolls down a frictionless ramp and is stopped by a spring. Include the cart, Earth, and ramp; do not include the spring. What energy storage is at the bottom of the ramp?
gravity
kinetic
elastic
internal
Power is the rate of doing
Work
Energy kinetic
Energy Elastic
Stretching a spring
A vertical spring with a spring constant of 900 N/m has been compressed 0.8 m. The vertical spring is then used to launch a 2 kg ball straight up into the air. What is the height of the ball at the peak of its trajectory, just before it falls?
288 m
360 m
0.07 m
14.7 m
An archer does 2000 J of work to pull a bow string 0.15 m. What is the spring constant (k) of the bow spring?
6,700 N/m
26,700 N/m
44,400 N/m
178,000 N/m
At what point does the biker have the greatest Kinetic Energy?
Point A
Point B
Point C
Point D
A cart rolls down a frictionless ramp and is stopped by a spring. Include the cart, Earth, and ramp in the system. Do not include the spring. What energy storage or transfer mechanism is at the bottom of the ramp?
Gravitational potential energy
Kinetic energy
Internal/Thermal energy
Elastic energy
Work leaving the system.
Power is __________________
the rate at which work is done.
measured in Watts.
measured in Joules.
a force.
A truck driver is trying to push a loaded truck with an applied force 100 N. He wants to move the truck 10 meters but, unfortunately, his attempt was unsuccessful the truck stays stationary no matter how hard the driver pushes. How much work is done by the driver?
none
1000 Joules
100 Joules
10 Joules
W = FΔx
W = ΔxF
W = FΔx2
What is a "system" in the context of energy?
A group of interacting or interrelated entities.
A single object with no interactions.
A closed loop with no energy transfer.
A random collection of objects.
Which of the following is an example of "work done by a force"?
A book resting on a table.
A car accelerating on a highway.
A light bulb glowing.
A fan spinning without moving air.
What is a "closed system"?
A system where energy can enter but not leave.
A system where neither energy nor matter can enter or leave.
A system where only matter can enter or leave.
A system where energy is constantly created.
Which type of energy is stored in a stretched or compressed object?
Thermal energy
Kinetic energy
Elastic potential energy
Chemical potential energy
When an object falls from a shelf, what happens to its gravitational potential energy?
It increases
It decreases
It remains constant
It triples
What is the formula for work done by a force?
Work = force × time
Work = force × distance
Work = mass × acceleration
Work = velocity × time
How much work is done when a force of one Newton moves an object a distance of 1 meter?
1 Joule
1 Watt
1 Newton
1 Pascal
Which of the following is equivalent to 1 Joule?
1 N/m
1 N/m²
1 N·m
1 N·s
How many Joules are in 1 megaJoule (1 MJ)?
1,000 J
1,000,000 J
1,000,000,000 J
1,000,000,000,000 J
What is the formula for calculating kinetic energy?
Kinetic energy = mass × speed
Kinetic energy = 0.5 × mass × speed²
Kinetic energy = mass × gravitational field strength × height
Kinetic energy = force × distance
How do you calculate gravitational potential energy?
Gravitational potential energy = mass × speed²
Gravitational potential energy = 0.5 × mass × speed²
Gravitational potential energy = mass × acceleration due to gravity × height
Gravitational potential energy = force × distance
What is the formula for work done by a force?
Work done = mass × speed²
Work done = 0.5 × mass × speed²
Work done = mass × gravitational field strength × height
Work done = force × distance
If a spring has a spring constant of 10 N/m, how much force is needed to compress it by 1 meter?
5 N
10 N
15 N
20 N
What is the definition of power in physics?
The rate at which energy is transferred or work is done
The total amount of energy used
The speed at which an object moves
The force applied to an object
If a kettle has a power rating of 3.0 kW, what does this mean?
It uses 3.0 Joules of energy per second
It transfers 3.0 Joules of energy per second
It transfers 3000 Joules of energy per second
It uses 3000 Joules of energy per second
In the example of a car accelerating from 0 m/s to 26 m/s in 6.0 seconds, what is the increase in kinetic energy if the mass of the car is 950 kg?
321,000 J
150,000 J
200,000 J
400,000 J
How is power calculated if the work done is 321,000 J over 6.0 seconds?
53,500 W
50,000 W
60,000 W
45,000 W
What is the principle of energy conservation?
Energy can be created and destroyed.
Energy can be transferred, stored, or dissipated but not created or destroyed.
Energy can only be stored.
Energy can only be dissipated.
A cyclist at the top of a hill has...
Kinetic Energy
Chemical Potential Energy
Elastic Potential Energy
Gravitational Potential Energy
Energy stored in objects being stretched or squashed...
Elastic Potential Energy
Kinetic Energy
Chemical Energy
Thermal Energy
P = ma
P = W * t
P = F x d
Rank in order, from largest to smallest, the gravitational potential energies of the balls.
1 > 2 = 4 > 3
1 > 2 > 3 > 4
3 > 2 = 4 > 1
3 > 2 > 4 > 1
A soccer player kicks a ball with 20 Newtons of force causing it to travel 100 meters. How much work is done on the ball?
200 J
80 J
5 J
2000 J
A worker climbs a ladder and does 8 J of work on a 2 N object. What is the distance they lift the object?
18 m
4 m
10 m
6 m
Bob (mass = 80 kg) uses 180 N of force to get him up the slope. The vertical distance is 2 m and the diagonal is 10 m. Calculate the work he does.
1600 J
160 J
3600 J
1800 J
Two army persons A and B each of weight of 500 N climb up a rope through a height of 10 m. A takes 20 s while B takes 40 s to achieve this task. What is ratio of the powers of person A and B?
1:2
1:4
2:1
14:1
If the speed of a car increases by 2 times, its kinetic energy becomes
4 times
8 times
16 times
12 times
A student lifts a 15 N mass through a distance of 1.5 m. What is the work done?
22.5 J
10 J
0.1 J
15 J
A weightlifter lifts a barbell of mass 45 kg through a height of 0.75 m. What is the gravitational potential energy gained by the barbell (use g=10 s2m )?
60 J
100 J
337.50 J
33.75 J
A motorcyclist is travelling at a speed of 35 m/s. The engine of the bike provides a force of 250 N to the motorbike. What is the work done by the motorbike in 1 second?
7 J
8750 J
140 J
10 000 J
A ball of mass 50 g is suspended at a height of 2.5 m from the ground. What would be the maximum value for kinetic energy the instant before the ball hits the ground? Assume air resistance is negligible.
0 J
1.25 J
12 500 J
1250 J
An asteroid of mass 500 kg approaches the Earth’s ground at a speed of 1000 m/s. What is the kinetic energy of the asteroid?
250 × 10^6 J
5.0 × 10^6 J
250 kJ
500 kJ
What happens to the spring constant when the spring is stretched?
Calculate the kinetic energy of a car of mass 600 kg travelling at 25 m/s.
187,500 J
93,750 J
375,000 J
225,000 J
A walker carrying a 20 kg backpack climbs to the top of a mountain 2500 m high. Calculate the gain in gravitational potential energy of the pack. (use g = 10 s2m ).
50,000 J
500,000 J
5,000,000 J
50,000,000 J
Calculate the velocity of a truck with kinetic energy 2.7 kJ and mass 600 kg.
(Be careful with your units!)
3 m/s
6 m/s
9 m/s
12 m/s
Calculate the kinetic energy of a mass of 5kg travelling at a velocity of 12m/s.
240 J
360 J
480 J
600 J
An athlete of mass 70 kg runs up a hill. The foot of the hill is 300 meters above sea-level. The summit is 1200 meters above sea-level. By how much does the athlete’s Eg increase? Assume that acceleration due to gravity g = 10 m/s2.
63,000 J
315,000 J
420,000 J
900,000 J
A van of mass 2000 kg is travelling at 15 m/s. Its speed increases to 25 m/s. By how much does its kinetic energy increase?
225,000 J
400,000 J
625,000 J
800,000 J
A crane lifts a load of 800 N to a height of 5 m. How much work is done by the crane?
4000 J
8000 J
2000 J
1000 J
A car engine does 3000 J of work in 10 seconds. What is the power output of the engine?
600 W
150 W
300 W
1000 W
A car of mass 800 kg accelerates from rest to a speed of 25 m/s in 10 s. What is its power?
25,000 W
50,000 W
75,000 W
100,000 W
