8th grade Ch 3 lesson 2

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

• appliance
• machine
• gadget

Tags

NGSS.K-2-ETS1-1

NGSS.K-2-ETS1-2

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.

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-PS3-1

NGSS.MS-PS3-5

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

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

• eliminate
• simplify
• reduce
• increase

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

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

A machine _____the way in which work is done.

• simplifies
• changes
• removes
• complicates

Tags

NGSS.MS-ETS1-1

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

• weight
• speed
• energy
• force

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

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

• angle
• input force

• speed
• weight

Tags

NGSS.MS-PS2-2