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A force is a push or pull on an object.
A “Spring Scale” is used to measure force.
Newton's
A upward force from an object sitting on a surface.
This force is always perpendicular to the surface.
A force from pulling on an object.
When the net forces on an object are unbalanced.
When the net forces on an object are balanced.
The force that opposes motion of objects that touch as
they move past each other.
1. Type of surface or material
2. The force pushing the surfaces together
Static Friction
Friction of objects that are not moving
Sliding Friction
A force that opposes motion as it slides over a surface
Rolling Friction
The friction force that acts on rolling objects
Fluid Friction
Opposes the movement of an object through a liquid or a gas
1.
2.
3.
4.
Fluid (Weakest)
Rolling
Sliding
Static (Strongest)
• A force that acts on an object as it moves through the
air.
• Air resistance is fluid friction
• Gravity pulls the object down
• Air resistance pushes up
A force that acts downward toward the center of the earth
The force of gravity acting on an object
A constant velocity when the gravitational force and the air
resistance force is equal
Aristotle
Galileo
Law of Inertia
An object in motion wants to stay in motion and an object at
rest will stay at rest unless acted on by an outside force.
The tendency of an object to resist a change in motion
Law of Acceleration.
The Force of any object is a product of its mass and
acceleration (F = m x a).
Law of Interaction
For every action there is an opposite and equal reaction.
Weight : The force of gravity acting on an object
Weight = m x 9.8 m/s2
Mass: Measured by the inertia of an object
A = 400 N upward
B = 200 N downward
C = No Movement
Look thru your packet and understand how to do force
problems using the formulas.
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Any Questions!!!!
Quiz Tomorrow!
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Good Luck and Study !!