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Types of forces Definition of a Force • A force is any type of push or pull Types of Forces Inside/Outside Forces • Most forces are outside forces Inside/Outside Forces • Most forces are outside forces • Here is an example of an inside force… Inside/Outside Forces • Most forces are outside forces • Here is an example of an inside force… A person pushing a car from the inside……it won’t move Inside/Outside Forces • Most forces are outside forces • Here is an example of an inside force… A person pushing a car from the inside……it won’t move INSIDE FORCES DO NOT CAUSE A CHANGE IN MOTION! Inside/Outside Forces • Most forces are outside forces • For the car to move, you have to exert an outside force! Inside/Outside Forces • Most forces are outside forces • For the car to move, you have to exert an outside force! Only OUTSIDE forces cause objects to change their motion ! Balanced/Unbalanced Forces • An example of balanced forces Balanced/Unbalanced Forces • An example of balanced forces Person sitting in a chair Balanced/Unbalanced Forces • An example of balanced forces Person sitting in a chair There is a force pushing down on the chair from the persons weight Balanced/Unbalanced Forces • An example of balanced forces Person sitting in a chair There is a force pushing down on the chair from the person weight There is an identical force that the chair is pushing up on the person Balanced/Unbalanced Forces • An example of balanced forces Person sitting in a chair If an object is at rest, then the forces are balanced! Balanced/Unbalanced Forces • An example of balanced forces Person sitting in a chair If an object is at rest, then the forces are balanced! The up and down forces cancel each other out Balanced/Unbalanced Forces • Another example of balanced forces A person riding a bicycle at a constant velocity Balanced/Unbalanced Forces • Another example of balanced forces A person riding a bicycle at a constant velocity We have the weight of the person pushing down and the seat pushing up Balanced/Unbalanced Forces • Another example of balanced forces A person riding a bicycle at a constant velocity We have the weight of the person pushing down and the seat pushing up The person peddling to move forward Balanced/Unbalanced Forces • Another example of balanced forces A person riding a bicycle at a constant velocity We have the weight of the person pushing down and the seat pushing up The person peddling to move forward Friction and air resistance pushing backward on the bike Balanced/Unbalanced Forces • Another example of balanced forces A person riding a bicycle at a constant velocity When an object moves at a constant velocity, it has balanced forces! Balanced/Unbalanced Forces • Another example of balanced forces A person riding a bicycle at a constant velocity When an object moves at a constant velocity, it has balanced forces! The up and down forces cancel each other Balanced/Unbalanced Forces • Another example of balanced forces A person riding a bicycle at a constant velocity When an object moves at a constant velocity, it has balanced forces! The up and down forces cancel each other The left and right forces also cancel each other Balanced/Unbalanced Forces • An example of unbalanced forces A dragster starting from rest Balanced/Unbalanced Forces • An example of unbalanced forces We have the weight of the dragster pushing down and the ground pushing up Balanced/Unbalanced Forces • An example of unbalanced forces We have the weight of the dragster pushing down and the ground pushing up The tires pushing the car forward Balanced/Unbalanced Forces • An example of unbalanced forces We have the weight of the dragster pushing down and the ground pushing up The tires pushing the car forward Friction and air resistance pushing back on the car Balanced/Unbalanced Forces • An example of unbalanced forces The up and down forces cancel each other out Balanced/Unbalanced Forces • An example of unbalanced forces The up and down forces cancel each other out But the left and right forces DO NOT cancel, one is greater than the other Balanced/Unbalanced Forces • An example of unbalanced forces When the forces don’t cancel we call that unbalanced forces which produce ACCELERATION! FORCES REVIEW FORCE TYPE MOTION FORCES REVIEW FORCE TYPE MOTION AT REST FORCES REVIEW FORCE TYPE MOTION BALANCED AT REST FORCES REVIEW FORCE TYPE MOTION BALANCED AT REST CONSTANT VELOCITY FORCES REVIEW FORCE TYPE MOTION BALANCED AT REST BALANCED CONSTANT VELOCITY FORCES REVIEW FORCE TYPE MOTION BALANCED AT REST BALANCED CONSTANT VELOCITY ACCELERATION FORCES REVIEW FORCE TYPE MOTION BALANCED AT REST BALANCED CONSTANT VELOCITY UNBALANCED ACCELERATION Homework Phun! • Do Worksheet 1a in your new packet for homework.
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