Description
Newton’s second law in terms of momentum, impulse, and the impulse–momentum theorem for AP Physics C: Mechanics. We start with the average force on a tennis ball, show that net force is the rate of change of momentum (F = dp/dt), and read force from a momentum function and from the slope of a p–t graph. Then we define impulse as the integral of net force over time (the area under an F–t graph), derive J = Δp, and use it with graphs and calculus to find forces and speeds.
In this video:
0:00 Hook: force on a tennis ball
0:48 What is impulse? Units of N·s and kg·m/s
2:56 Newton’s second law in terms of momentum
5:09 Example: force from a momentum function
7:14 Example: slope of a p–t graph
10:50 Impulse and the area under an F–t graph
11:40 The impulse–momentum theorem
13:17 Example: impulse from an F–t graph
15:10 Example: impulse from a force function (calculus)
Download the guided notes and practice problems for this unit at houstonscience.com.
Part of the AP Physics C: Mechanics Unit 4 (Linear Momentum) series.