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Chapter 4 Forces and Newton’s Laws of Motion. Motion and Newton’s first law What is a force? Identifying forces Newton’s second law Free-body diagrams Newton’s third law. Topics:. Sample question:.

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Motion and newton s first law what is a force identifying forces newton s second law

Chapter 4

Forces and Newton’s Laws of Motion

  • Motion and Newton’s first law

  • What is a force?

  • Identifying forces

  • Newton’s second law

  • Free-body diagrams

  • Newton’s third law

Topics:

Sample question:

These ice boats sail across the ice at great speeds. What gets the boats moving in the first place? What keeps them from going even faster?

Slide 4-1


Motion and newton s first law what is a force identifying forces newton s second law

Reading Quiz

4.An action/reaction pair of forces

A.point in the same direction.

B.act on the same object.

C.are always long-range forces.

D.act on two different objects.

Slide 4-6


Motion and newton s first law what is a force identifying forces newton s second law

Answer

4.An action/reaction pair of forces

D.act on two different objects.

Slide 4-7


Motion and newton s first law what is a force identifying forces newton s second law

... is a push or pull.

... acts on an object.

... requires an agent.

... is a contact force or a long-range force.

... is a vector.

What Is a Force?

A force...

Slide 4-10


Motion and newton s first law what is a force identifying forces newton s second law

Galileo (1564-1642)

Developed the idea of experimental science

Re-examined natural motion of objects and how objects move

Made astronomical observations that challenged Earth-centered solar system model.


Motion and newton s first law what is a force identifying forces newton s second law

Newton (1642-1727)

Newton's work based on experiments of how objects interact.

His laws of motion and law of gravity described how all objects interact with eachother.


Motion and newton s first law what is a force identifying forces newton s second law

Newton’s Zeroeth Law of Motion

Objects are dumb - They have no memory of the past and cannot predict the future. Objects only know what acts directly on them in a given moment.

Slide 2-34


Motion and newton s first law what is a force identifying forces newton s second law

Newton's Zeroeth Law of Motion

DEMO - Pushing the cart on track


Motion and newton s first law what is a force identifying forces newton s second law

Identifying Forces:Freebody (Force) Diagrams and System Schema

Slide 2-34


Motion and newton s first law what is a force identifying forces newton s second law

Free-Body Diagrams

Slide 4-24


Motion and newton s first law what is a force identifying forces newton s second law

System Schema

  • Draw a diagram where you write down the name of each object in the system and then draw a solid circle drawn around it. Draw two sided arrows like this between the object circles of objects that interact (This illustrates all interactions between the objects in this diagram). Draw an additional dotted line around the block to indicate it is the object of interest. This diagram is called a system schema.

  • A system schema illustrates all the relevant interactions between the objects in a given physical situation


Motion and newton s first law what is a force identifying forces newton s second law

Newton's First Law of Motion

Every object continues in a state of rest or a state of motion with a constant speed in a straight line unless acted on by an unbalanced force.


Motion and newton s first law what is a force identifying forces newton s second law

Newton's First Law of Motion

DEMO - Air Puck motion

DEMO - Smash the HAND

DEMO - Tablecloth


Motion and newton s first law what is a force identifying forces newton s second law

What Causes Motion?

In the absence of any forces acting on it, an object will continue moving forever. Motion needs no “cause.”

Slide 4-8


Motion and newton s first law what is a force identifying forces newton s second law

Newton’s Second Law

Slide 4-22


Motion and newton s first law what is a force identifying forces newton s second law

Normal Force

Slide 4-15


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