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Forces

Week 18-Physical Science

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What is a Force?

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By the end of today…

  • Understand what a force is
  • Give several examples of different types of forces around us

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A Force

“A push or pull”

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Measured in Newtons (N)

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Forces can:

  • Make an object move
  • Change the direction an object is moving
  • Make an object speed up
  • Stop an object
  • Make an object change shape

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Do objects have to touch to exert a force?

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Do objects have to touch to exert a force?

  • Electromagnetic forces
    • Magnetism
    • Electricity/Static
  • Gravity

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Make a list of ALL the forces acting on you right now as you’re sitting at your table

…

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By the end of today…

  • Understand what a force is
  • Give several examples of different types of forces around us

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Newton’s First Law

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By the end of today…

  • Be able to draw a diagram showing the forces acting on an object
  • Understand Newton’s First Law

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Newton’s First Law

An object at rest will remain at rest

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AND

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An object in motion will remain in motion unless acted upon by an unbalanced force

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Draw a diagram of you right now and label the forces that are acting on you.

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Using your marble, find a way to “make it rest” and label the forces acting on it.

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Use your marble and find a way to make it “be in motion” and label the forces acting on it?

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By the end of today…

  • Be able to draw a diagram showing the forces acting on an object
  • Understand Newton’s First Law

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Newton’s Second and Third Laws

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By the end of today…

  • Explain how forces affect motion using Newton's Second and Third Laws
  • Solve basic problems to find net force and acceleration

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Velocity

How fast an object is moving (speed + direction)

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Acceleration

Negative acceleration = slowing down

Positive acceleration = speeding up

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How fast the velocity is changing

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Roll a marble so that it goes one table length in 1 second

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Roll a marble so that it goes one table length in 2 seconds

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Roll a marble so it travels 1 meter in one second

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Roll a marble so it travels 2 meters in one second

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Newton’s Second Law

Forces are unbalanced → objects accelerate!

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Newton’s Second Law

Force = mass * acceleration

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F=m*a

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Newton’s Third Law

“For every action, there is an equal and opposite reaction”

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Great Bustard

40+ lbs

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By the end of today…

  • Explain how forces affect motion using Newton's Second and Third Laws
  • Solve basic problems to find net force and acceleration