 # 1.Force of attraction between two masses. 2.All masses have gravitational pull. 3.Determined by distance and mass. 4.In our case on Earth we perceive Gravity.

## Presentation on theme: "1.Force of attraction between two masses. 2.All masses have gravitational pull. 3.Determined by distance and mass. 4.In our case on Earth we perceive Gravity."— Presentation transcript:

1.Force of attraction between two masses. 2.All masses have gravitational pull. 3.Determined by distance and mass. 4.In our case on Earth we perceive Gravity to be moving us “down”.

Is the force of friction the same when holding all 3 of these items?

Why is the rock not moving? Gravity says the rock should move be pushed downward. However, in this case the force of friction between the rock and the ground is greater than the force of gravity on the rock.

5 N Can you figure out the net force here? Opposite directions- Subtract 0 Balanced 5 N 12 N 7 Right Unbalanced 5 N 25 N 20 Left Unbalanced 25 N 0 balanced

5 N Can you figure out the net force here? Same direction- add 10 Right Unbalanced 5 N 12 N 17 Right Unbalanced 5 N 25 N 30 Left Unbalanced 25 N 50 Left balanced

Other forces that act at a distance? Magnetism N S S N Magnetism refers to physical phenomena arising from the force between magnets, objects that produce fields that attract or repel other objects. Attract Repel

Other forces that act at a distance? Electricity Electric Force N S S N Magnetism refers to physical phenomena arising from the force between magnets, objects that produce fields that attract or repel other objects. Attract Repel

Which is of the following is correct? (More than one answer) A. Tension is greater than gravitational force B. The force is unbalanced. C. The NET FORCE IS 400 Up D. The NET FORCE IS 2000 Up E. The NET FORCE IS 2000 Down

Forces

Forces Make a T chart of all the contact forces and forces that act at a Distance.

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