Understanding Work, Power, and Mechanical Principles in Physics

Physics

7th Grade,
8th Grade,
9th Grade

NGSS

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| Attempts: 13 | Questions: 28 | Updated: Nov 28, 2025

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1. What is the Power Formula?

Power P = work * time (W * t)

Power P = work / time (W ⁄ t). Energy E is in joules, and time t is in seconds.... Power P = work / time (W ⁄ t). Energy E is in joules, and time t is in seconds. 1 W = 1 J/s. W = F * d)

Power P = work - time (W - t)

Power P = work + time (W + t)

Power is defined as the amount of work done per unit of time and is calculated using the formula Power P = work / time (W ⁄ t). The correct formula incorporates the division operation to determine power.

Explanation

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About This Quiz

Explore the fundamentals of Physical Science with a focus on Work, Power, Machines, and Mechanical Advantage. This educational tool enhances understanding of physics principles, crucial for learners aiming to grasp the practical applications of these concepts.

2. What is the Watt (W) used for?

A unit of energy

A unit of current

A unit of electrical resistance

Is an SI unit of power, which is equal to 1J/s. So 50 J/s = 50W.

The Watt is specifically used as a unit of power, representing the rate at which work is done or energy is transferred.

Explanation

The Watt is specifically used as a unit of power, representing the rate at which work is done or energy is transferred.

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3. What is Work Input?

Work output is greater than work input.

Work input is always zero for a machine.

Is the work input of a machine is equal to the effort force times the distance over which the effort... Is the work input of a machine is equal to the effort force times the distance over which the effort force is exerted.

Work input is the same as power input.

Work input is a key concept in understanding the efficiency and performance of machines. It is calculated by multiplying the effort force by the distance over which it is exerted, showing the amount of work done to operate the machine.

Explanation

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4. What is work output?

C) is the work done by a plant.

A) is the work done by a human.

Is the work done by a simple machine, compound machine, or any type of engine model.

B) is the work done by a computer.

Work output refers to the work done by machines or engines, not by humans, computers, or plants.

Explanation

Work output refers to the work done by machines or engines, not by humans, computers, or plants.

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5. What are the 6 simple machines?

(2) gear

(3) rope

(1) lever; (2) wheel and axle; (3) inclined plane; (4) wedge; (5) screw; and (6) pulley.

(1) spring

The 6 simple machines are basic mechanical devices that are the foundation of more complex machines in engineering and physics.

Explanation

The 6 simple machines are basic mechanical devices that are the foundation of more complex machines in engineering and physics.

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6. What is the work formula?

Work is calculated by subtracting force from the amount of movement of an object (W = d - F).

Work is calculated by dividing force by the amount of movement of an object (W = F / d).

Work is calculated by adding force and the amount of movement of an object (W = F + d).

Is calculated by multiplying the force by the amount of movement of an object (W = F * d). Force... Is calculated by multiplying the force by the amount of movement of an object (W = F * d). Force is measured in N (newtons) and distance in m (meters).

The work formula involves multiplying force by distance, not dividing, adding, or subtracting the two quantities.

Explanation

The work formula involves multiplying force by distance, not dividing, adding, or subtracting the two quantities.

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7. What is a Joule?

Is equal to the energy used to accelerate a body with a mass of one kilogram using one newton of... Is equal to the energy used to accelerate a body with a mass of one kilogram using one newton of force over a distance of one meter. One joule is also equivalent to one watt-second.

A unit of measurement for temperature

A term used in baseball to describe a home run hit with the bases loaded

A type of pastry commonly found in France

A Joule is a unit of energy in the International System of Units (SI) and is commonly used in physics to measure work or energy transfer.

Explanation

A Joule is a unit of energy in the International System of Units (SI) and is commonly used in physics to measure work or energy transfer.

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8. What happens when you increase power in order to do work at a faster rate?

Increasing power results in slower work rate

If you do work at a faster rate, requires more power. You increase POWER, you can increase the amount of... If you do work at a faster rate, requires more power. You increase POWER, you can increase the amount of WORK done in a given TIME.

Increasing power has no impact on the amount of work done

Decreasing power increases the amount of work done

Increasing power allows for more work to be done in a given amount of time due to the relationship between power, work, and time.

Explanation

Increasing power allows for more work to be done in a given amount of time due to the relationship between power, work, and time.

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9. What is Horsepower (hp) equivalent to in watts according to James Watt?

550 foot-pounds per second is approximately equivalent to 500 watts.

550 foot-pounds per second is approximately equivalent to 1000 watts.

550 foot-pounds per second is approximately equivalent to 600 watts.

Is 550 foot-pounds per second is approximately equivalent to 745.7 watts. This unit was first defined by James Watt (1736-1819).

Horsepower, a unit of power, is defined as 550 foot-pounds per second and is approximately equivalent to 745.7 watts according to James Watt's definition.

Explanation

Horsepower, a unit of power, is defined as 550 foot-pounds per second and is approximately equivalent to 745.7 watts according to James Watt's definition.

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10. Vocabulary Note (Machines) - 3

Machines have no effect on work performance. They do not change the force needed or the direction of a force.

Machines make work harder to perform. They increase the force required and the distance over which a force acts.

Machines have no purpose in performing work. They are simply aesthetic additions to a task.

Machines make work easier to perform. They change the size of a force needed, the direction of a force, or... Machines make work easier to perform. They change the size of a force needed, the direction of a force, or the distance over which a force acts.

Machines are designed to make work easier by changing the force required, the direction of the force, or the distance over which a force acts. Incorrect answers provided do not align with the basic principle of machines simplifying work.

Explanation

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11. What is Input Distance?

The force required for input.

The direction of the input.

Is the distance the input force acts through.

The velocity of the input.

Input Distance refers to the distance through which the input force acts, influencing the work or motion being performed.

Explanation

Input Distance refers to the distance through which the input force acts, influencing the work or motion being performed.

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12. What is meant by Output Force?

Is the force exerted by a machine.

Is the force required to operate a machine.

Is the force exerted on a machine by an external source.

Is the force produced by human effort.

Output Force refers to the force that a machine exerts, in contrast to the force required to operate it, the force exerted on it by an external source, or the force produced by human effort.

Explanation

Output Force refers to the force that a machine exerts, in contrast to the force required to operate it, the force exerted on it by an external source, or the force produced by human effort.

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13. What is meant by Output Distance?

Output Distance represents the speed at which the machine outputs its results.

Output Distance signifies the distance between the machine and its source of power.

Output Distance refers to the distance traveled by the machine's input force.

Is the distance the output force is exerted through by the machine.

Output Distance specifically refers to the physical distance over which the output force is applied or exerted by a machine, impacting its mechanical efficiency and performance.

Explanation

Output Distance specifically refers to the physical distance over which the output force is applied or exerted by a machine, impacting its mechanical efficiency and performance.

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14. What is Mechanical Advantage (MA)?

The amount of energy consumed by a machine during operation.

The weight of a machine in relation to the force applied to it.

The ratio of the force produced by a machine to the force applied to it, used in assessing the performance... The ratio of the force produced by a machine to the force applied to it, used in assessing the performance of a machine. The number of times a machine increases input force!

The speed at which a machine operates in relation to its input force.

Mechanical Advantage (MA) is specifically defined as the ratio of output force to input force in the context of assessing a machine's performance.

Explanation

Mechanical Advantage (MA) is specifically defined as the ratio of output force to input force in the context of assessing a machine's performance.

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15. What is Ideal Mechanical Advantage (IMA)?

The kinetic energy produced by a machine.

The efficiency of a machine in a given task.

The mechanical advantage of a real-world machine.

Theoretical mechanical advantage, is the mechanical advantage of an ideal machine. It is calculated using physics principles because no ideal... Theoretical mechanical advantage, is the mechanical advantage of an ideal machine. It is calculated using physics principles because no ideal machine actually exists.

Ideal Mechanical Advantage (IMA) refers to the theoretical mechanical advantage of an ideal machine, not a real-world machine. It is calculated based on theoretical physics principles.

Explanation

Ideal Mechanical Advantage (IMA) refers to the theoretical mechanical advantage of an ideal machine, not a real-world machine. It is calculated based on theoretical physics principles.

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16. What is the formula for Ideal Mechanical Advantage (I.M.A.)?

I.M.A. = Output force / Input force

I.M.A. = Input distance / Output distance

I.M.A. = Output distance / Input distance

I.M.A. = Input force / Output force

The Ideal Mechanical Advantage formula represents the ratio of the input distance to the output distance in a mechanical system to calculate its efficiency.

Explanation

The Ideal Mechanical Advantage formula represents the ratio of the input distance to the output distance in a mechanical system to calculate its efficiency.

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17. What unit is efficiency typically expressed in?

Is expressed in percentage (%). It is found as the Work output / Work input X 100%.

Efficiency is typically expressed in meters (m).

Efficiency is typically expressed in seconds (s).

Efficiency is typically expressed in watts (W).

Efficiency is a measure of how well a system converts input into output. It is commonly represented as a percentage, calculated using the formula: Work output / Work input X 100%.

Explanation

Efficiency is a measure of how well a system converts input into output. It is commonly represented as a percentage, calculated using the formula: Work output / Work input X 100%.

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18. What does Mechanical Efficiency measure?

It measures the weight of a machine.

It measures the speed of a machine.

It measures the temperature of a machine.

Measures the effectiveness of a machine in transforming the energy and power that is input to the device into an... Measures the effectiveness of a machine in transforming the energy and power that is input to the device into an output force and movement.

Mechanical Efficiency specifically focuses on the energy and power transformation effectiveness of a machine, not its weight, speed, or temperature.

Explanation

Mechanical Efficiency specifically focuses on the energy and power transformation effectiveness of a machine, not its weight, speed, or temperature.

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19. What is a lever?

A type of pulley system

A wedge-shaped tool used for splitting wood

A rigid bar resting on a pivot, used to help move a heavy or firmly fixed load with one end... A rigid bar resting on a pivot, used to help move a heavy or firmly fixed load with one end when pressure is applied to the other.

A flexible rope used for lifting heavy objects

A lever is a simple machine that helps in moving heavy objects by applying pressure at one end. It is a rigid bar, not a pulley system, flexible rope, or wedge-shaped tool.

Explanation

A lever is a simple machine that helps in moving heavy objects by applying pressure at one end. It is a rigid bar, not a pulley system, flexible rope, or wedge-shaped tool.

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20. What is a fulcrum?

The wheel of a bicycle

The handle of a broom

Is a fixed point on a lever (bar) that is free to move around a fixed point.

The blade of a knife

A fulcrum is a point or support on which a lever pivots. It is essential for the functioning of a lever by providing a fixed point for movement.

Explanation

A fulcrum is a point or support on which a lever pivots. It is essential for the functioning of a lever by providing a fixed point for movement.

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21. What is the output arm of a lever?

The force required to lift an object.

The input force of a lever.

Of a lever is the distance between the output force and the fulcrum.

The length of the lever.

The output arm of a lever refers to the distance between the output force (the force applied to move the load) and the fulcrum (the pivot point around which the lever rotates).

Explanation

The output arm of a lever refers to the distance between the output force (the force applied to move the load) and the fulcrum (the pivot point around which the lever rotates).

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22. What is Power?

Is the rate of doing work. It is the amount of energy consumed per unit time. Having no direction, it... Is the rate of doing work. It is the amount of energy consumed per unit time. Having no direction, it is a scalar quantity.

Power is the speed at which something moves

Power is the force acting on an object

Power is the ability to control others

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23. Vocabulary Note (Work) - 1.

The amount of work done is dependent on the weight of the object being moved.

If a force is to do WORK on an object, it must act in the same direction as the... If a force is to do WORK on an object, it must act in the same direction as the object moves. If there is NO movement, then NO WORK is done.

If a force acts opposite to the direction of object movement, it will still do work.

Work can be done even if there is no force applied to the object.

Work is defined as force acting on an object to cause displacement in the same direction as the force applied. Therefore, if the force is in the opposite direction of the object's movement, no work is being done. Work is directly related to force and displacement, not just the presence of force. The amount of work done is determined by both the force applied and the distance over which the object is moved, not just the weight of the object.

Explanation

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24. What is the unit of Power?

Volt

Ohm

Is the joule per second (J/s), known as the watt in honor of James Watt, the eighteenth-century developer of the... Is the joule per second (J/s), known as the watt in honor of James Watt, the eighteenth-century developer of the steam engine.

Ampere

Power is the rate at which work is done or energy is transferred. The unit of power is the watt (W), which is equivalent to one joule per second (or J/s). Therefore, the correct answer is the watt.

Explanation

Power is the rate at which work is done or energy is transferred. The unit of power is the watt (W), which is equivalent to one joule per second (or J/s). Therefore, the correct answer is the watt.

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25. What is effort force?

Effort force is the force exerted by the machine on an object.

Effort force is the force applied to a machine or input force is the work done on a machine.

Effort force is the force required to overcome friction in a machine.

Effort force is the resistance force in a machine.

Effort force refers to the force applied to a machine or the work done on a machine, not the resistance force, force exerted by the machine, or the force required to overcome friction.

Explanation

Effort force refers to the force applied to a machine or the work done on a machine, not the resistance force, force exerted by the machine, or the force required to overcome friction.

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26. What is the formula for Actual Mechanical Advantage (AMA)?

AMA = Output Force / Input Force

AMA = Input Force - Output Force

AMA = Input Force / Output Force

AMA = Output Force + Input Force

The Actual Mechanical Advantage formula calculates the ratio of the output force to the input force in a mechanical system.

Explanation

The Actual Mechanical Advantage formula calculates the ratio of the output force to the input force in a mechanical system.

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27. What is Actual Mechanical Advantage (AMA)?

Is the force that a machine can multiply while subtracting losses from the machine having to overcome friction.

Actual Mechanical Advantage (AMA) is the energy efficiency of a machine in performing work.

Actual Mechanical Advantage (AMA) is the ratio of output force to input force in a machine.

Actual Mechanical Advantage (AMA) is the speed at which a machine can operate.

Actual Mechanical Advantage (AMA) specifically refers to the force that a machine can multiply while taking into account losses from friction, rather than being simply a ratio of output force to input force or a measure of energy efficiency or speed.

Explanation

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28. What is the input arm (Force) of a lever?

The input arm of a lever is the force exerted in the same direction as the lever movement.

The input arm of a lever is the shortest distance between the input force and the fulcrum.

The input arm of a lever is not relevant to the mechanics of a lever.

Of a lever is the distance between the input force and the fulcrum.

The input arm of a lever refers to the distance between the input force and the fulcrum, which determines how effectively a lever can multiply force.

Explanation

The input arm of a lever refers to the distance between the input force and the fulcrum, which determines how effectively a lever can multiply force.

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