1. Example: What impulse is imparted by exerting a 12 N force for 4.0 s?
Change in momentum = Impulse
Impulse = F t where
F = Force
t = time that the force is exerted
(F or t = 0???)
Example: What impulse is imparted by exerting a 12 N force for 4.0 s?

2. Impulse is area under = (40 N)(6.0s) = 240 Ns
Example - Impulse is area under F vs t graph t F
100 N
5.0 s
Impulse is area under = (40 N)(6.0s) = 240 Ns

4. What is the impulse of a 6.12 N force acting for 2.3 seconds?
14 Ns

5. A rocket engine is rated at 14 Ns of impulse, and burns for 1
A rocket engine is rated at 14 Ns of impulse, and burns for 1.7 seconds. What is the thrust of the engine?
8.2 N

6. What is the impulse? 100 N F t 5.0 s 560 Ns
Average F = 70 N, t = 8.0 s, Impulse = (70 N)(8.0 s) = 560 Ns
560 Ns

7. What is the impulse? 100 N F t 5.0 s 470 Ns
Impulse = (40 N)(3.0 s) + (70 N)(5.0 s)= 470 Ns
470 Ns

8. What is the impulse of the D12 engine?
20 Ns
Impulse = (10. N)(1.73 s-0.11 s) + (28 N-10 N)( ) = Ns (about 20 Ns)