Note

Remember: axes is called a ‘plane’.

Notes

• Resultant force = net force in a plane (x/y)
• Friction is only effecting if the surface is “smooth” or “rough”
• Friction applies in the other direction to the movement (velocity)
• At the maximum height of an object being thrown (projection model), $t = \frac{1}{2}$ of total $t$, $v = 0$

Reasoning

• Model the spin of the object
• Take account dimensions of the object
• More accurate value for $g$ (doesn’t always work - works for questions which, i..e, assume $g$ is $10$)
• Not model as a particle ]