Download presentation

Presentation is loading. Please wait.

Published byAustin Spencer Modified over 2 years ago

1
Chapter 12 Lesson 3 Newton’s 3 rd Law of Motion a.k.a. - Action and Reaction

2
I. Newton’s 3 rd Law A.Def – to every action, there is an equal and opposite reaction 1. Forces come in pairs 2. Ex: Firing a gun or cannon 3. How does a swimmer in the pool use Newton’s 3 rd law of Motion? 4. Action-reaction pairs do not cancel out…they act on different objects.

3
Group Problem 1. Explain why jumping from a “john” boat to a dock is much more difficult than jumping from a barge to a dock? Explain using arrows to represent forces. You may also draw a picture.

4
II. Momentum A.Def – the property of a moving object due to its mass and velocity (speed). 1. Units kg x m/s 2. Rolling Demo 3. Formula = momentum (p) = mass (kg) x velocity (m/s) 4. Ex: 2 bumper cars are headed for a collision. Car #5 is traveling at 1.6 m/s and has a mass of 120 kg. Car #1 is traveling at 1.09 m/s and has a mass of 175 kg. Which car will “bump” the other car back?

5
#5 (p = m x v) 120 kg x 1.6 m/s = 192 kg m/s #1 (p = m x v) 175 kg x 1.09 m/s = 190.75 kg m/s

6
B.The Law of Conservation of Momentum 1. Def - all momentum is transferred between objects. 2. Ex: Tennis Ball and Basketball Demo 3. Ex: Playing pool 4. Ex: Tackling in football

7
5. Does this make sense? (Assume no friction) Cue ball 10 kg x m/s ball 1 1.55 kg x m/s ball 2 1.36 kg x m/s ball 3 2.25 kg x m/s ball 4 1.14 kg x m/s ball 5 2.89 kg x m/s ball 6 0.40 kg x m/s ball 7 0.41 kg x m/s

8
12.3 wks (on separate sheet of paper) 1.What is the momentum of an 80 kg runner moving at a speed of 3.5 m/s? 2.Another runner who has mass of 650,000 g is running at a speed of 4.2 m/s. What is the momentum of the runner? 3.If runner #1 collides with runner #2 who will win the collision? 4.A ball has a momentum of 32 kg x m/s. What is the mass of the ball if it is traveling at 43 m/s? 5.What is speed of a ball that has a mass of 48 grams and has a momentum of 38 kg x m/s?

Similar presentations

Presentation is loading. Please wait....

OK

Chapter 6.3 Learning Goals

Chapter 6.3 Learning Goals

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Hrm ppt on recruitment 2016 Ppt on conceptual art books Ppt on big data and hadoop Ppt on abstract artists Ppt on high level languages Ppt on wireless home security system Ppt on conservation of wildlife and natural vegetation of north Ppt on natural resources and conservation lesson Ppt on natural disasters for class 9 Ppt on tamper resistant outlet