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Forces
What is a force?
   A force is a push or pull from one
    object to another object

   Examples: Earth’s gravitational pull on
    us, you pushing a chair, a table
    supporting a book
What is a force?
   All forces have both size and direction
   The unit of force is the Newton (N)
   What other concepts have both a size
    and direction?
Net Forces
   The net force is the combination all of
    the forces acting on the object

   Whenever more than one force act on
    an object, always sum the forces into
    a single net force
Forces in the Same Direction
   When forces act in the same direction,
    you add the forces together

   The net force will be in the same
    direction as the two original forces

             F1= 5 N          Fnet= 8 N
             F2= 3 N
Forces in the Opposite Direction
     When two forces act in opposite
      directions, you subtract the smaller
      force from the larger force

     The net force will be in the direction of
      the larger force
F1= 2 N          F2= 7 N           Fnet= 5 N
Balanced Forces
   When the sum of the forces acting on
    an object equals zero, the forces are
    said to be balanced.

   Balanced forces are equal in size and
    opposite in direction
Balanced Forces- Newton’s 1st
Law
   There is no change in motion when
    the forces are balanced.
   A stationary object remains stationary
   A moving object has constant velocity
Unbalanced Forces
   When the sum of the forces are non-
    zero, there are unbalanced forces
    acting on the object

   Unbalanced forces produce a change
    in motion, so they are necessary to
    cause accelerated motion
The Big Idea
   Unbalanced forces result in a net force
 The net force causes the object to
  accelerate
 This acceleration can be predicted
  and described
Force, Mass, and
Acceleration
   An object accelerates when a net
    force acts upon it

   The net force is equal to the mass
    times the acceleration:
                 F = ma
   This relationship is Newton’s 2nd Law
Force, Mass, and
 Acceleration
     The acceleration of the object
      depends on both the forces acting on
      the object and the mass of the object

     The net force and acceleration are
      always in the same direction!!
F1= 2 N         F2= 7 N          Fnet= 5 N

                                  a
Example 1
   How much force is needed to
    accelerate a 30 kg scooter at a rate of
    1 m/s2?
           F = ma
           F = (30 kg) x
           (1m/s2)
           F = 30 N
Example 2
   How much force is needed to
    accelerate a 0.5 kg baseball at a rate
    of 0.04 m/s2?
           F = ma
           F = (0.5 kg) x (0.04
           m/s2)
           F = 0.2 N

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Forces

  • 2. What is a force?  A force is a push or pull from one object to another object  Examples: Earth’s gravitational pull on us, you pushing a chair, a table supporting a book
  • 3. What is a force?  All forces have both size and direction  The unit of force is the Newton (N)  What other concepts have both a size and direction?
  • 4. Net Forces  The net force is the combination all of the forces acting on the object  Whenever more than one force act on an object, always sum the forces into a single net force
  • 5. Forces in the Same Direction  When forces act in the same direction, you add the forces together  The net force will be in the same direction as the two original forces F1= 5 N Fnet= 8 N F2= 3 N
  • 6. Forces in the Opposite Direction  When two forces act in opposite directions, you subtract the smaller force from the larger force  The net force will be in the direction of the larger force F1= 2 N F2= 7 N Fnet= 5 N
  • 7. Balanced Forces  When the sum of the forces acting on an object equals zero, the forces are said to be balanced.  Balanced forces are equal in size and opposite in direction
  • 8. Balanced Forces- Newton’s 1st Law  There is no change in motion when the forces are balanced.  A stationary object remains stationary  A moving object has constant velocity
  • 9. Unbalanced Forces  When the sum of the forces are non- zero, there are unbalanced forces acting on the object  Unbalanced forces produce a change in motion, so they are necessary to cause accelerated motion
  • 10. The Big Idea  Unbalanced forces result in a net force  The net force causes the object to accelerate  This acceleration can be predicted and described
  • 11. Force, Mass, and Acceleration  An object accelerates when a net force acts upon it  The net force is equal to the mass times the acceleration: F = ma  This relationship is Newton’s 2nd Law
  • 12. Force, Mass, and Acceleration  The acceleration of the object depends on both the forces acting on the object and the mass of the object  The net force and acceleration are always in the same direction!! F1= 2 N F2= 7 N Fnet= 5 N a
  • 13. Example 1  How much force is needed to accelerate a 30 kg scooter at a rate of 1 m/s2? F = ma F = (30 kg) x (1m/s2) F = 30 N
  • 14. Example 2  How much force is needed to accelerate a 0.5 kg baseball at a rate of 0.04 m/s2? F = ma F = (0.5 kg) x (0.04 m/s2) F = 0.2 N