Unit 3 Science Quizz

Work occurs when...

• there is a transfer of energy after a force is applied over a distance.

• there is a transfer of power divided by the time it takes to lift an object.

• there is no gravity over the period in which work is being applied.

• there is an overload of energy.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What is the SI unit of work equal to?

• Electricity

• Paper

• Rust

• Force and distance

What is the definition of power?

• The rate at which work is done.

• The oxygen you breathe in.

• Another term for electricity.

• The rate in which a clock hand moves.

What ways can a machine make work easier?

• Changing the size of the force.

• The direction the force acts.

• The direction of the force.

• Decreasing the amount of work that needs to be completed.

What is the formula for MA (Mechanical Advantage)?

• MA=F(out)/F(in)

• MA=Fd

• MA=W(out)/W(in) x 100

• weight/time

What is the ratio of output work to input work?

• Mechanical Advantage

• Ideal Mechanical Advantage

• Efficiency

• Force

What is a simple machine?

• Machines that do work using one movement.

• Machines that combine to create compound machines.

• Machines that contribute to the final result of work.

• Machines that store energy for further use.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

The point where a lever pivots is called the...

What type of machines are gears that work together?

• Simple machines

• Compound machines

• Complex machines

• gears

What is the formula for efficiency?

• efficiency = W(out)/W(in) x 100%

• efficiency = F(in)/F(out)

• efficiency = Fd

• efficiency = energy x distance