Work Power and Energy

Presentation

•

Science

•

8th - 9th Grade

•

Hard

•

NGSS

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

Standards-aligned

NIKHIL TOLWANI

Used 14+ times

FREE Resource

8 Slides • 8 Questions

Work ,Power and Energy

by NIKHIL SIR

Work

Work is also...

Multiple Select

Work can be..

Positive

Negative

Both positive and Negative

Zero

Multiple Choice

How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?

15 J

45 J

0 J

5 J

Power

time rate of doing work or delivering energy, expressible as the amount of work done W, or energy transferred, divided by the time interval t

SI unit Watt (W)
Commercial unit Kw=1000 W
1HP =746 watt

Fill in the Blanks

Convert 1kw-hr of energy into Joules (J)

Type answer...

Multiple Select

Power is also

$P=F\times V$

F=force

V=velocity

$P=\frac{F.s}{t}$

s=displacement

F=force

A scalar quantity

A Vector quantity

" Energy can neither be created nor be destroyed, can only be changed from one form to another . "

Energy

Energy possessed by an object due to its position or Configuration.

P.E.= mgh or P.E.= ½kx²

Potential Energy

Energy possessed by an object due to its motion.

K.E.= ½mv²

Kinetic Energy

Mechanical Energy

M.E.= K.E.+P.E. Unit of Energy is J

Multiple Choice

Potential or kinetic?
Stretched bow and arrow?

kinetic

potential

Multiple Select

Select all: Work is equal to...

KE + PE

Change in energy

Multiple Choice

How does conservation of energy explain why something that is falling should speed up?

It gains kinetic energy because it gains potential energy.

It loses kinetic energy because no work was done on it.

It gains kinetic energy because it loses potential energy.

It loses kinetic energy because the Earth gains potential energy.

Multiple Choice

At which point(s) on the roller coaster is the kinetic energy at its maximum?

Law of Conservation of Energy

Let's Proove it.

Work ,Power and Energy

by NIKHIL SIR

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