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Forces. Why does an object move? Why does an object change directions? Why does an object stop, or start to move?. What is a Force?. Force- push or pull. Described by: magnitude (strength) direction Measured in Newtons (N). Forces.

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forces
Forces
  • Why does an object move?
    • Why does an object change directions?
    • Why does an object stop, or start to move?
what is a force
What is a Force?
  • Force- push or pull.
  • Described by:
    • magnitude (strength)
    • direction
  • Measured in Newtons (N)
forces1
Forces
  • When forces are exerted in the SAME direction the two forces are ADDED.
  • EXAMPLES:
    • #1
    • #2

6N+3N=9N

forces in opposite directions
Forces in Opposite Directions
  • When forces are exerted in the OPPOSTIE directions, the numbers are SUBTRACTED
unbalanced forces
Unbalanced Forces
  • When forces go in same direction
  • Causes objects to move, stop, and change directions.
    • #1
    • #2

6N+3N=9N

slide7

=

+

1 direction

Force 1 + Force 2 = Net Force

UNBALANCED FORCE

slide8

-

- When one force is bigger

- Causes objects to move, stop, and change directions.

=

Overall direction

UNBALANCED FORCE

unbalanced force
Unbalanced force
  • Ex) Walking the dog
    • Draw an arrow for boy
    • Draw an arrow for dog
    • Are arrows the same

direction?

    • Are arrows the same size?
balanced force
Balanced Force
  • When both forces are equal in magnitude and in opposite directions
  • The net force will then be equal to 0.
  • NO MOVEMENT

I bet this guy hopes the forces stay balanced!!

slide12
+

0

=

2 forces cancel each other

BALANCED FORCES

forces balanced or not
Forces- Balanced or Not?
  • EXAMPLES:
    • #1
    • #2
    • #3

6N+3N=9N

slide15
+

?

=

What about this force?

the movement of a car
The movement of a car
  • What are the forces working on this car?

What other two forces are missing?

slide19

BIG IDEAS

  • There are forces that exist in nature that create movement and allow objects to become stationary.
  • Without forces, we would have mayhem.