Ch 3-2

Presentation

•

Science

•

8th Grade

•

Medium

•

NGSS

MS-PS3-5, MS-PS2-2, MS-PS3-4

Standards-aligned

Brandi Storey

Used 1+ times

FREE Resource

4 Slides • 39 Questions

Ch 3-2

Energy Transformations and Work

The amount of net work done can be calculated using the following equation.

Final Energy - Initial Energy = Work Done
Example: A bicycle was has an initial energy of zero. It accelerated and now 125 joules of energy.
125 ( Final Energy ) - 0 (starting energy) = 125 Joules

Work is defined as applying a force to an object to move it in a direction.

If the object does not move then no work is done!
Work is measured in joules (just like energy!)

Energy is the ability for an object to do work.

Energy is measured using joules (J)
There are multiple types of energy. We will talk more about the types later.

Multiple Choice

Staircase is a machine? What type of this machine?

A pulley

A lever

An inclined plane

Multiple Choice

Which picture shows a lever?

Multiple Choice

Which picture shows a pulley?

Multiple Choice

A lever is a stiff bar that rests on a support (fulcrum). A lever is used to lift and move things. When you push down on one end, the other end lift up.

Which picture below shows a lever?

Multiple Choice

An inclined plane, or a ramp is a slanted surfaces. It connects a lower level to a higher level.

Which picture below shows an inclined plane?

Multiple Choice

What form of energy does a compressed spring have?

heat energy

kinetic energy

chemical energy

potential energy

Multiple Choice

When gasoline is burned in a car engine, ________ energy is converted into _________ energy.

heat, chemical

chemical, potential

mechanical, chemical

chemical, mechanical

Multiple Choice

How does the mass of a bowling ball that has been rolled down the lane affect the kinetic energy?

The kinetic energy does not depend on the mass of the bowling ball.

The kinetic energy is increasing proportional to the mass of the bowling ball.

The kinetic energy is decreasing proportional to the mass of the bowling ball.

The kinetic energy is increasing proportional to the square of the mass of the bowling ball.

Multiple Choice

Which of the following best represents the Law of Conservation of Energy?

Energy CAN be created but NOT destroyed

Energy CAN be destroyed but NOT created

Energy can NOT be created Nor destroyed

Energy CAN be created and CAN destroyed

Multiple Choice

Which of the following statements is not correct?

Energy is the capacity to do work.

Work can be expressed as force × displacement

Unit of work done is joule.

Unit of energy is Newton

Multiple Choice

The capacity to do work is called ___________.

acceleration

power

energy

pressure

Multiple Choice

The work done by a body is the product of force and

distance.

displacement.

speed.

velocity.

Multiple Choice

Work can be _____________.

positive only

negative only

either positive or negative

neither positive nor negative

Multiple Choice

Work done =

$F\times d$

$\frac{F}{d}$

Multiple Choice

Work is calculated by taking the __________ in final and initial energy.

Sum

Difference

Square Root

Product

Multiple Choice

Jeremias pushed on a car with all of his might, but it did not move. Did he do any work?

Yes

Multiple Choice

What two things must occur for work to be done?

Force and Energy

Energy and Movement

Force and movement

Multiple Choice

Energy is the ability to do work.

True

False

Multiple Choice

When electric current passes through an electric bulb, electric energy is converted to

Heat energy only

light energy only

both heat and light energy

both light and chemical energy

Multiple Choice

Potential energy of a stretched string is

Gravitational P.E.

Plastic P.E.

Elastic P.E.

None of these

Multiple Choice

Water stored in a dam possesses

Kinetic energy

Potential energy

Electric energy

no energy

Multiple Choice

S.I. unit of energy is

erg

dyne

joule

newton

Multiple Choice

In a tug of war, work done by losing team is

zero

positive

negative

none of these

Multiple Choice

Work is done on a body when

force acts on the body but not displaced

force does not act on the body but it is displaced

force acts on the body perpendicular to the direction of displacement of body

force act on a body and the displacement is in direction of force or opposite to direction of force

Multiple Choice

Which of the following shows the correct order of the energy transformations that occur when green plants produce their food from the Sun’s energy?

chemical → thermal

light → chemical

thermal → light

chemical → electrical

Multiple Choice

A lamp that plugs into a wall socket draws energy which flows through a thin wire in the bulb causing it to glow. What energy transformations are taking place?

chemical → light → electrical

mechanical → sound → light

thermal → solar → electrical

electrical → thermal → light

Multiple Choice

Which type of energy transformation occurs when a flashlight shines?

chemical → thermal → electrical

chemical → electrical → light

thermal → chemical → light

chemical → electrical → chemical

Multiple Choice

Which of the following chemical energy to radiant energy?

solar calculator

windmill

glow stick

firecracker

Multiple Choice

Which of the following radiant energy to electrical energy?

solar calculator

windmill

glow stick

firecracker

Multiple Choice

What is the best example of a device that converts electrical energy to light and sound?

a clock radio

a toaster

a flashlight

an electric toothbrush

Multiple Choice

What is the best example of a device that converts electrical energy to thermal energy?

a toaster

a clock radio

a flashlight

an electric toothbrush

Multiple Choice

During most energy transformations and transfers, wasted energy takes the form of __.

electromagnetic radiation

sound waves

random mechanical movements

heat

Multiple Choice

What kind of energy transformation takes place in this system?

chemical to electrical to light

electrical to chemical to light

electrical to light to chemical

light to chemical to electrical

Multiple Choice

In energy transformations, "wasted energy" usually takes what form?

heat

chemical energy

light

sound waves

Multiple Choice

Which of the following energy transfers occurs when food is digested?

chemical to mechanical

radiant to nuclear

mechanical to potential

thermal to chemical

Multiple Choice

Turning on a lamp is an example of energy transformation from electrical to 3 forms of energy. Which of these is NOT created by the lamp?

radiant

light

heat

chemical

Multiple Choice

What best describes the energy conversion that takes place in a microwave oven?

electrical to light to thermal

chemical to thermal to light

electrical to thermal to sound

nuclear to thermal to chemical

Multiple Choice

What is the best example of a machine that converts electrical energy into kinetic energy and sound energy?

an electric toothbrush

a toaster

a flashlight

an iron

Multiple Choice

What is the best example of a machine that converts electrical energy into kinetic energy and sound energy?

an electric toothbrush

a toaster

a flashlight

an iron

Ch 3-2

Energy Transformations and Work

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