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Force and Motion

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Aristotle: Greek philosopher who described motion of objects but performed no experiments ... Skateboarding down a hill causes positive acceleration. ... – PowerPoint PPT presentation

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Title: Force and Motion


1
Force and Motion
  • Integrated Science 1

2
A Little History . . .
  • Aristotle Greek philosopher who described
    motion of objects but performed no experiments
  • Galileo Italian scientist who used
    experimentation to disprove belief that heavy
    objects fall faster than light objects at the
    Leaning Tower of Pisa

3
Speed vs. Velocity
  • Speed Distance / Time
  • Velocity speed in a given direction

D S T
4
Newtons 1st Law of Motion
  • An object in motion or at rest will stay as such
    until acted upon by an outside force.
  • This is also called inertia.

5
Newtons 2nd Law of Motion
  • Force Mass x Acceleration
  • ( F m a )

F M A
6
Friction is a Force
  • Friction is a force that works opposite the
    direction of movement.
  • Ex Car tires have more friction on asphalt than
    on an icy road.

7
Mass is Not Weight
  • Mass is the amount of matter in an object.
  • Weight takes into account the pull of gravity on
    that object.
  • Ex A 114 kg man weighs 253 lbs. on Earth but
    only 41 lbs. on the moon. (same mass but less
    gravity)

8
Acceleration
  • Acceleration change in speed or direction over
    time
  • Ex Slamming on the brakes causes negative
    acceleration. Skateboarding down a hill causes
    positive acceleration. Driving in a circle at
    constant speed is also acceleration.

9
Newtons 3rd Law of Motion
  • For every action there is an equal but opposite
    reaction.
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