Force, Momentum and Impulse
Newtons second law reminder
- An equation for newtons second law is:
\(\(F=ma\)\) - However this equation only works if the mass is constant.
\(\(F=\frac{\Delta p}{\Delta t}\)\)
\(\(F=\frac{m_{2}v_{2}-m_{1}v_{1}}{\Delta t}\)\) - These are the "better" versions of newtons second law as they can be applied to more cases.
Impulse Exam Questions
- 125km/h = 34.72m/s
\(34.72\times18000 = 624960\)
\(\frac{624960}{62000}=10.08\) - \(\frac{1}{2}\times15\times2500=18750\)
\(v=\frac{p-mv}{F}\)
\(v=\frac{18750-(1200\times 25)}{1200}=40.625\) - \(F=\frac{mv-uv}{\Delta t}\)