Phisics the first semester

Work

Its when force and direction are the same

Another way u can tell that work is done?

Its by looking at its kinetec energy

When work is done 2 things happend what are they?

1 the object moves as soon as force is apliead

2 the direction of the object goes the same way as the force

What are the units of them?

Distance= metes

Force= newtons

Work=joule bc it uses energy and joule its the unit of energy

The unit of power is what? And how is it amde? And 1 wat is equal to how much?

Its watt its equations 1 wat is equal to 1j/s

What measures how fast work happens?

Power does

When is work greatent?

Power is greatent when more work is done in a given amount of time or its greatent if the time deacreases

Machines

Is to make work easier by changing the size or direction of the force

Work input

Work output

Yk its easy

Wich one is greater work output or input?

Work input is greater

Force and distance can both of them increases together ? Or decreases together?

Yes and no

Machien efiecinecy machiene advantage

Efioiciency its the compare of work input with work put put

Advantage its the multiplication of force

How do we know if a machin is efeiencent?

The less work todo to over come friction the more effiecent it is

What is used to over come friction?

Work input

What is an ideal machine?

A machine that has 100% effiencincy

A machine can change distance and force or?

Or both but for increasing its only 1 not both

Why are machines not 100% effiecient?

Beacuse some work is done to over come friction

All the types of machines

Levers pul;lys and wheel and axle and incline plane wedges screws

Levers. And there MA stuff

Yk and if u dont BOM

1 clas levers used gto increases distance or force

2 class levers how how does the force increases?

3 how does the output decreases?

Yk if the load is closer to the fulcrum input force has to be higher to make it even if the input force is closer to the fulcrum the out put will be less

Wheel and axle

Its a object that consists of 2 circular objects at diffrent sizes

Examples of wedges

Doorstops chisels ax heads and plows

Types of kinetic energy and potentional energy

Sound thermal electrical

Light chemical nuclear

Consevered energy

Its the energy shared by only multiple objects

Some of the original energy converts to

Thermal energy

Energy effieciency

Eenrgy effecincy it’s the compare of conservation of energy before and after and the amount of use full consveration

Beacuse of what allways some of the energy converts intoi thermal energy?

Beacuse of friction

What is perputual motion?

Its the motion that can send asmuch as energy needed and enters as much as energy needed and its imposible

Temprature

The measure of kinetic energy particles in the air

Heat

Its the transfer of temoprature bet ween 2 objkects with diffrent temprature

Al objects such as heater radiate what kind of waves?

Electro magnetic waves