We understand that equations can be complicated
- Don't panic, they're only letters!
- We'll show you how to use equations for your calculations
example: kinetic energy formula
This formula is used to calculate the amount of Kinetic Energy an object has
- Energy is measured in joules (j), just like songs are measured in minutes (m)!
- To work out the kinetic energy we need to first see what we have
- For this formula (a.k.a this equation) we need to put in (plug in, enter, substitute, replace..it's all the same) some values to get the kinetic energy
- So we need to know "m" which is the mass and "v" which is the velocity
plugging in the values
Remember to convert the values into Standard Units
- So our value for "m" is 26g
- Our value for "v" is 30 m/s
- We need to just put the values for "m" and "v" into this equation, do the maths and we'll get our answer
- BUT before we do that we need to make sure the units are correct
mini break
STANDARD UNITS STANDARD UNITS....
- So in order for these formulas to work, you need to make sure the units for "m" and "v" are in standard units
- The units for "m" are in grams currently, we need to convert this to "kg", this means 26g = 0.026kg
- The units for "v" are in m/s which is standard so that's all good!
- Now let's do the calculation
almost there
Do The Maths!!!
- Now replace the values for "m" and "v" with your values you have in standard units
- Remember that only the "v" is squared
- And the answer is 11.7 joules
sooo proud of you
Well Done You
- There you go! Now you know how to use equations
- They're just placeholders for numbers to go into so we can calculate some important values such as energy
