1. Physics presentation practice “A” By: Basil Manee Algarni Grade: 9A

2. SAMPLE PROBLEM “A” PROBLEM: A 2250 kg pickup truck has a velocity of 25 m/s to the east. What is the momentum of the truck? SOLUTION: Data: p = mv = (2250 kg)(25 m/s east) m = 2250 kg p = 5.6 × 10 4 kgm/s to the east v = 25 m/s to the east p = ?

3. Practice “A” PROBLEM: 1. A deer with a mass of 146 kg is running head-on toward you with a speed of 17 m/s.You are going north. Find the momentum of the deer. SOLUTION: Data: p = mv m=146 p= (146 kg)(17 m/s south) V=17 m/s south p= 2482 kgm/s P=?

4. Practice “A” PROBLEM: 2. A 21 kg child on a 5.9 kg bike is riding with a velocity of 4.5 m/s to the northwest. a. What is the total momentum of the child and the bike together? b. What is the momentum of the child? c. What is the momentum of the bike? SOLUTION: a) mass = 21+5.9 = 26.9 kg Data: p= mv Mass of the child = 21 kg p= 26.9 x 4.5 = 121.05 kgm/s to the northwest Mass of the bike = 5.9 kg b) p= mv Velocity = 4.5 m/s to the northwest. p= 21 x 4.5 = 94.5kgm/s to the northwest c) p= mv p= 5.9 x 4.5 = 26.55kgm/s to the northwest

5. Practice “A” Problem: 3. What velocity must a 1210 kg car have in order to have the same momentum as the pickup truck in Sample Problem A? SOLUTION: Data: M= 1210 kg p= mv P=5.6 × 10 4 kgm/s to the east V= p/m V= ? V= 5.6x10 4 /1210 V= 46.28 m/s east