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Motion

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Motion & Forces Force A push or a pull *Cause an object to start moving, stop moving, or change direction Unbalanced Force Cause an object to start moving, stop ... – PowerPoint PPT presentation

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Title: Motion


1
Motion Forces
2
Force
  • A push or a pull
  • Cause an object to start moving, stop moving, or
    change direction

3
Balanced and Unbalanced Forces
4
Unbalanced Force
  • Cause an object to start moving, stop moving, or
    change directions
  • Unbalanced forces will change an objects motion

5
Unbalanced Forces
  • Net Force the overall force on an object after
    all the forces on an object are added up

1 2 1
1 2
1

1
3
2
6
Balanced Forces
  • Equal forces acting on each other in opposite
    directions
  • Balanced forces acting on an object will not
    change the objects motion

1 0 1
1 0
1
7
Newton's 1st Law of Motion
An object at rest will remain at rest and an
object that is moving at a constant velocity
will remain at a constant velocity unless acted
upon by an unbalanced force.
Inertia-the tendency of an object to resist
change in its motion. Newtons 1st Law of Motion
is also called the Law of Inertia.
8
Inertia
  • Force is needed to change the motion of an
    object. Every object resists any change to its
    motion. This change is called inertia. The
    tendency of an object to resist change in its
    motion
  • Ex. If you are not wearing a seat belt when a car
    crashes inertia continues to carry you forward

9
What affects Inertia?
  • Mass the greater the mass the greater the inertia
  • Question what has greater inertia a Honda Civic
    going 30 k/ph, or a Truck at the same speed?

10
Friction
  • The force that one surface exerts on another when
  • the two rub against each other.
  • Depends on 2 factors
  • The two surfaces involved
  • How hard are the surfaces pushing against each
    other

11
Types of Friction
  • Sliding when solids slide over each other
  • Rolling - when an object rolls over a surface
  • Fluid- objects moving through fluids (liquid or
    gases)

12
Weight vs. Mass
  • Weight is a measure of the force of gravity on an
    object, mass is a measure of the amount of matter
    in an object
  • You have the same mass on the Moon as Earth, but
    different weights

13
Gravity
  • Gravity is a force between any two objects, the
    force of gravity is related to the mass of the
    objects, and their distance from each other

14
Force in Fluids
  • Force is applied to a fluid causing pressure
    increase in a fluid
  • The heart applies pressure to the blood forcing
    it through your vessels, blood flow in the body
    requires force
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