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A force is a push or pull on a given in a specific direction
A force is a push or pull on a given in a specific direction
We have many different types of forces in our life, but they are all divided into two basic types:
We have many different types of forces in our life, but they are all divided into two basic types:
- Contact Forces -- forces that require physical contact (friction, push/pull, upward force)
***There must be an unbalanced force on an object to make it move***
***There must be an unbalanced force on an object to make it move***
Force is usually measured in Newtons (N)
Force is usually measured in Newtons (N)
Force has a size and direction just like velocity and acceleration
Force has a size and direction just like velocity and acceleration
It is possible for multiple forces to act on one object.
It is possible for multiple forces to act on one object.
Scientists use the net force to figure out which direction an object will move
Scientists use the net force to figure out which direction an object will move
Net force is the sum of all forces acting on an object
Net force is the sum of all forces acting on an object
Use the two pictures below for examples:
Use the two pictures below for examples:
Forces can also act in the same direction instead of opposite directions. This can make an object move more quickly or help it change direction!
Forces can also act in the same direction instead of opposite directions. This can make an object move more quickly or help it change direction!
Friction
Friction
Some forces naturally work against an applied force which causes the object to change motion. These are called opposition forces
Some forces naturally work against an applied force which causes the object to change motion. These are called opposition forces
One example of an opposition force is elastic resistance. When you stretch a rubber band backwards, elastic resistance tries to force the rubber band forward. When you let go, the resistance takes over and the rubber band goes flying.
One example of an opposition force is elastic resistance. When you stretch a rubber band backwards, elastic resistance tries to force the rubber band forward. When you let go, the resistance takes over and the rubber band goes flying.
Another example of an opposition force is friction. Friction works against the motion of an object and there are different types of friction
Another example of an opposition force is friction. Friction works against the motion of an object and there are different types of friction
Friction also causes heat! [think of a match]
Friction also causes heat! [think of a match]
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