If the input distance is increased in a single-pulley system, what else increases?

Friction in the system decreases.

What are some ways do machines make doing work easier?

1. Automating repetitive tasks 2. Reducing physical effort 3. Increasing precision

A machine can make work easier in what ways?

A machine makes work easier by reducing effort, increasing efficiency, and enhancing precision.

A machine enhances creativity by generating ideas.

A machine decreases productivity by slowing down processes.

A machine makes work harder by increasing fatigue.

What is a mechanical advantage?

Mechanical advantage is the ratio of output force to input force in a machine.

Mechanical advantage is the distance traveled by the input force.

Mechanical advantage refers to the weight of the machine itself.

Mechanical advantage is the speed ratio of a machine.

What is the efficiency of a machine?

Efficiency = (Useful Work Output / Total Energy Input) x 100%

Efficiency = (Total Work Input / Useful Energy Output) x 100%

Efficiency = (Total Energy Input / Useful Work Output) x 100%

Efficiency = (Useful Work Input / Total Energy Output) x 100%

Why can't the work done by a machine be greater than the work done on a machine?

The work done by a machine cannot be greater than the work done on it due to the conservation of energy.

Machines can create energy from nothing.

The work done by a machine is always equal to the work done on it.

Machines can amplify the work done on them.

How can a machine be built so that it is as close to 100 percent efficiency as possible?

Use high-quality materials, optimize design, minimize energy losses, and implement advanced control systems.

Use low-quality materials to reduce costs

Ignore maintenance and repairs to save time

Increase energy consumption for better performance

Does friction affect a machine's longevity?

Yes, friction negatively affects a machine's longevity.

Friction has no impact on a machine's longevity.

Friction improves a machine's performance over time.

Friction only affects the efficiency, not the longevity.

Why do machines demonstrate artificial intelligence?

Because machines are capable of doing tasks for humans by programming them with a specific information.

Because machines are not really intelligent compare to humans.

Because machines are useful and relevant in our daily lives.

Because machines give you artificial information which are important.

Which of the following best describes the work-energy principle?

Work done on an object is equal to the change in its kinetic energy

Energy can be created or destroyed

Energy is always conserved in a closed system

What does a machine do ?

increase the amount of work that is done

decrease the amount of work being done

What is mechanical advantage?

The ratio of output force to input force

The sum of input and output forces

The difference between input and output forces

The product of input and output forces

What is the primary function of a pulley?

To change the direction of a force

To increase the speed of an object

A simple machine that consists of a rigid bar pivoted on a fulcrum

What is mechanical advantage?

Mechanical advantage is the ratio of output force to input force in a machine.

Mechanical advantage is the distance moved by the input force.

Mechanical advantage refers to the weight of the machine itself.

Mechanical advantage is the speed ratio of a machine.

What is the definition of a machine?

A device that makes work easier

A device that has no effect on work

A device that makes work more difficult

8th grade Ch 3 lesson 2

Authored by Kathleen Smith

Science

8th Grade

NGSS covered

Used 20+ times

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40 questions

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MULTIPLE CHOICE QUESTION

5 sec • 1 pt

A(n) _____is any device that makes doing something easier.

appliance

machine

gadget

Tags

NGSS.K-2-ETS1-1

NGSS.K-2-ETS1-2

MULTIPLE CHOICE QUESTION

5 sec • 1 pt

What is a machine?

A machine is a concept that cannot be physically defined.

A machine is a device that uses energy to perform work.

A machine is a natural phenomenon that occurs without human intervention.

A machine is a type of animal that moves on its own.

MULTIPLE CHOICE QUESTION

5 sec • 1 pt

Why do all machines involve some kind of motion?

Machines only work when they are stationary.

Motion is irrelevant to the function of machines.

All machines are designed to remain still.

All machines involve some kind of motion to perform work and manipulate energy.

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-1

MULTIPLE CHOICE QUESTION

5 sec • 2 pts

Do machines decrease the amount of work needed fo a task?

No, Machines increase the amount of work needed for a task.

No, Machines have no effect on the amount of work needed for a task.

No, Machines only complicate the task without reducing work.

No, machines decrease the amount of force but do not decrease the amount of work that must be done for a task.

Tags

NGSS.MS-ETS1-1

MULTIPLE CHOICE QUESTION

5 sec • 1 pt

Although a machine makes doing work easier, it does not _____the amount of work required.

eliminate

simplify

reduce

increase

MULTIPLE CHOICE QUESTION

5 sec • 1 pt

Why do all machines involve some kind of motion?

All machines involve some kind of motion to perform work and manipulate energy.

All machines are designed to remain still.

Motion is irrelevant to the function of machines.

Machines only work when they are stationary.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-5

MULTIPLE CHOICE QUESTION

5 sec • 1 pt

What would be more advantageous a high amount of input work or output work?

Input work is always more beneficial.

Both input and output work are equally advantageous.

Output work is less important than input work.

Output work is more advantageous.

Tags

NGSS.MS-PS3-5

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8th grade Ch 3 lesson 2

A(n) _____is any device that makes doing something easier.

What is a machine?

Why do all machines involve some kind of motion?

Do machines decrease the amount of work needed fo a task?

Although a machine makes doing work easier, it does not _____the amount of work required.

Why do all machines involve some kind of motion?

What would be more advantageous a high amount of input work or output work?

A machine _____the way in which work is done.

To use a machine, you must apply a(n) ___to it.

When a hammer removes a nail, the ______ comes from pulling on the hammer's handle.

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