IB Physics Thermodynamics + Forces

Velocity

Displacement/time

3 ways to accelerate

Speeding up, slowing down, and changing direction

Gradient of a position time graph

Velocity

Gradient of a velocity time graph

Acceleration

Area of a velocity time graph

Displacement

Area of acceleration time graph

Velocity

Average velocity on a graph

The tangent line to the slope of the instantaneous velocity

Formula when you don’t have acceleration and you’re not looking for it

s = u+v divided by 2 * t

Average velocity formula

u+v divided by 2

Formula when you don’t have final velocity and you’re not looking for it

s = u*t + ½ a*t²

Formula for when you don’t have time and you’re not looking for it

v² = u² + 2as

Formula when you have no displacement and you’re not looking for it and you don’t have it

v = u + a*t

In free fall problems acceleration is always what

A known value. -9.8, the acceleration value for gravity

When throwing something straight up into the air, what happens to the velocity as the object

It slows down

For projectile motion problems, what is true for the x and y components in regards to time?

It’s the same

What we know about the x motion in projectile motion problems

Velocity is constant, and there is no acceleration

What we know about the y motion in projectile motion problems

There is acceleration, a=g=-9.8

What effects fluid resistance

How fast it goes, the surface area, and what fluid it’s going through.

Pairs act on

Different objects

Force of gravity =

Mass in kg * acceleration of gravity (-9.8)

Normal force equation

F = ma

Static friction formula (NOT GIVEN TO YOU MAKE SURE YOU KNOW THIS)

F_s≤µ_sF_N

Kinetic/dynamic friction formula (NOT GIVEN TO YOU MAKE SURE YOU KNOW THIS)

F_k = µ_kF_N

µ =

F_f / F_N

What is true of static friction and kinetic friction ALWAYS?

µ_s > µ_k

µ is

The coefficient of friction

Slope of a force of friction and normal force graph

µ

Bigger normal force means

Bigger force of friction

How to find max. static friction

Multiply coefficient of static friction of the surface by the normal