Forces

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# Forces - PowerPoint PPT Presentation

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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Presentation Transcript
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
• When forces are exerted in the SAME direction the two forces are ADDED.
• EXAMPLES:
• #1
• #2

6N+3N=9N

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

6N+3N=9N

=

+

1 direction

Force 1 + Force 2 = Net Force

UNBALANCED FORCE

-

- When one force is bigger

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

=

Overall direction

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
• 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!!

+

0

=

2 forces cancel each other

BALANCED FORCES

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

6N+3N=9N

+

?

=