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Published byJanis Garrison Modified over 9 years ago
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Physical Science Mr. Barry
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F=ma As you’ve learned from Newton’s 2 nd Law, Force can be found by multiplying mass and acceleration Reactionary Forces Newton’s 3 rd Law: “For every action there is an equal and opposite reaction” This applies to forces such as gravity and force generated by movement as well
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Reaction to Movement There is a reactionary force to movement know as friction Friction: the force that opposes motion between two surfaces that are touching each other Depends on the types of surfaces rubbing against each other and the types of forces causing movement
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Friction Low friction = easy to slide on (ice, oil) High friction = hard to slide on (sandpaper, gravel) If the friction force is greater than or equal to the force of movement, not movement will occur What type is happening on the right?
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Friction on Force Diagrams ALWAYS opposes motion (acts in opposite direction)
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Reaction to Gravity Look at your notebook sitting on your desk right now. If gravity is pulling it down, what is keeping it from falling to the floor? The force that opposes gravity is known at the Normal Force The normal force will always be equal to the force of gravity (as long as no other forces are acting in the vertical direction) The normal force will always be opposite the direction of the force of gravity (UP)
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Normal Force The heavier the object, the greater the gravitational force and thus the greater the normal force If the mass of the object on the left is 6 kg, what is the normal force acting on it? If the object is resting on a table, what is providing the normal force?
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Normal Force on Force Diagrams
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