3.3 ­ Newton's Laws of Motion March 11, 2016

DefinitionTermnewton

mass

tension

friction

electromagneticforces

Force Terms Sections 3.1 and 3.2

Drag each definition beside the term it matches best.

CheckAnswer

directly proportional to an object’s inertia

free­body diagram

kg m/s2

acts to oppose the motion or intended motion of an object

attract and repel

pulling force that points toward a rope

3.3 ­ Newton's Laws of Motion March 11, 2016

Newton’s First Law of Motion Section 3.2

The animation below shows two identical balls and two identical ramps. Click on A, and describe what happens. Then click on B, and describe what happens.

CheckAnswer

Discussion

In A, what are the forces acting on the ball on the horizontal portion of the ramp? Are the forces vertical, horizontal, or both? Is a force necessary to keep the ball moving? Explain.In B, what are the forces acting on the ball on the horizontal portion of the ramp? Are the forces vertical, horizontal, or both? Explain.

3.3 ­ Newton's Laws of Motion March 11, 2016

Rounding a Corner

How have car designers used this law of motion to come up with safety features for cars?

Crash Test Dummy

3.3 ­ Newton's Laws of Motion March 11, 2016

Practice Questions

Pg.126 #1,2,5 (Section 3.2)

Pg.133 #1 ­ 4

3.3 ­ Newton's Laws of Motion March 11, 2016

3.3 ­ Newton’s­3rd­Law.ppt (class note)

Nick Warner on Newton's 3rd Law

3.3 ­ Newton's Laws of Motion March 11, 2016

Newton’s Third Law of MotionSection 3.4

Newton’s third law of motion states that each action force has a reaction force that is equal in magnitude and opposite in direction. Rockets are a good example of Newton’s third law at work.

Below are a number of different scenarios. Drag and drop the checkmark to show which of the scenarios can be considered a rocket.

(a) An inflated balloon is released and allowed to fly around.

(b) An arrow is projected through the air toward a target.

(c) A space shuttle is launched.

(d) A cannonball is fired straight up from a cannon.

(e) A jet engine propels an aircraft forward.

CheckAnswer

Discussion

3.3 ­ Newton's Laws of Motion March 11, 2016

Activity

We will be applying our knowledge of kinematics, to test Newton's Laws

­ Two people will sit on a scooters (a somewhat frictionless surface)

­ One will push the other and we want to measure the force exerted on them to see if they are equal

Ideas as to measure the force exerted on them...

3.3 ­ Newton's Laws of Motion March 11, 2016

Answers for Discussion Questions:

Slide 8

(a) The air coming out of the balloon pushes on the balloon. (b) When shooting an arrow, there is no rocket propulsion. A projectile is not a rocket. (c) Rockets are used to launch the space shuttle. (d) When firing a cannon, there is no rocket propulsion; a cannonball is not a rocket. (e) The engine acts as a rocket; the engine exhaust pushes the jet forward.

Back

Attachments

3.3 ­ Newton’s­3rd­Law.ppt