Physics Formulas
SI Units

Physics formulas are used to work out the variable which is not known by using the variables which we do know, thus creating a physics equations. We can also use them to predict the outcome of certain things. For example if you wanted to launch a rocket you could calculate the amount of thrust you would need to get it to lift off with a certain amount of acceleration.

Physics is a science, but relies heavily on mathematical skills. The main one
being algebra as you need to be able to substitute and rearrange an
equation if necessary.

In physics equations letters can stand for certain things so just like in algebra where letters can stand for numbers. Even though an equation is set out to work out for example force it can be rearranged to show any of the letters in the equation as long as you have the value of the others. F=ma, this equation will give us the force, but we can rearrange it to give us either the mass of the object or acceleration, f/a=m or f/m=a. As long as there is only one unknown we can easily rearrange the equations to give us the answer.

Note: All these physics formulas require you to use SI units
(International System of Units)

SI units

Quantity Quantity symbol Unit symbol
Mass m kilograms Kg
Force F Newtons N
distance d meters m
speed v Velocity v
Pressure p Pascal Pa
Work W Joules J
Energy E Joules J
Time t Seconds s


Formulas

gravitational potential formula
gravitational potential formula

Ep stands for energy potential which is stored energy. This equation will be able to tell you how much potential energy an object has when it is raised above the ground. Here on earth gravity accelerates all body’s towards the ground at 9.81 m/s^2 if friction is not taken into account.

Kinetic energy
Kinetic energy

This equation lets you calculate the amount of kinetic energy an object has.

Weight force formula
Weight force formula

There is a difference between mass and weight. Mass never changes it is the amount of matter an object is made up of. Weight on the other hand can change since it is the force of gravity acting upon a mass. This is why on the moon you weigh less than you do on earth.

'Science Kids'

Stay updated and subscribe to "Science News For Kids" our monthly e-zine.

Pressure formula
Pressure formula

Pressure referrers to much force is concentrated into an area.

Velocity formula
Velocity formula

The triangle is the Greek letter Delta and in physics means change. Change in distance divided by the change in time gives you the velocity of an object.

Acceleration formula
Acceleration formula

This is one of the more famous physics formulas since it comes from Newton’s second law of motion.



Return to top

Go back from 'Physics Formulas' to HOME.



Science Kids our monthly e-zine by interest enter your E-mail
Name
Then

Don't worry — your e-mail address is totally secure.
I promise to use it only to send you Science News For Kids.
Experiments

Experiments

Static

Static

Temperature

Temperature

Liquids

Liquids

Magnets

Magnets

T-shirt

Pi Number Design T-shirt
Pi Number Design T-shirt by Ars_Brevis
See other Pi number T-Shirts at zazzle

Binder

Science Geek Lab Rat Binder
Science Geek Lab Rat Binder by anwarart
Look at more Cartoon Binders at zazzle