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P H Y S I C S Chapter 3: Newton’s Laws of Motion Section 3A: Forces and Free-Body Diagrams PowerPoint Presentation
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P H Y S I C S Chapter 3: Newton’s Laws of Motion Section 3A: Forces and Free-Body Diagrams. Force. Action that changes an object’s state of motion Slow down Speed up acceleration Change direction. Two Types. 1) Contact Force: through contact push/pull

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P H Y S I C S

Chapter 3: Newton’s Laws of Motion

Section 3A: Forces and Free-Body Diagrams

force
Force
  • Action that changes an object’s state of motion
    • Slow down
    • Speed up acceleration
    • Change direction
two types
Two Types

1) Contact Force:through contact

  • push/pull

2) Field Force:at a distance

  • gravity/electromagnetism
free body diagram
Free Body Diagram
  • Shows all forces (vector) acting on an object
  • Unit for force = N (Newton)

FN = 500 N

Fp= 1000 N

Ff = 200 N

Fg = 500 N

newton
Newton
  • The amount of force it takes to accelerate a 1kg mass at 1 m/s2
  • 1N = 1kg*m/s2
common forces
Common Forces
  • Fg = weight  downward
  • FN = normal  perpendicular to surface
  • Ff = friction (includes air)  opposite to motion
  • Fp= push/pull
  • FT= tension in string

FRICTION

FN

FRICTION

Fg

net force
Net Force
  • Vector sum of all forces on an object

ΣF = (summation) net force

  • x and y components:

F(x) = F·cosθ

F(y)= F·sinθ

Fp(y)

Fp

θ

Fp(x)

in class problem 1
In-Class Problem #1

A 9 N book sits at rest on a table.

ΣF = 0 N

in class problem 2
In-Class Problem #2

A sky diver that weighs 600 N falls towards the earth and experiences a wind resistance of 250 N.

ΣF = 350 N 