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Unit V - Force

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Unit V - Force

Force

- An interaction between two different objects that results in a push or a pull.
- An object can’t exert a force on itself.

- Examples of forces

Friction

- All friction is parallel to the surface the object is sliding on and opposite the direction of motion

- When the object isn’t moving

- When the object is sliding

Tension

- The force is always co-linear with the string.
- The tension is the same everywhere in the string.
- A pulley simply changes the direction of the force.

- The normal force is always perpendicular to the surface that’s causing it.

- Represent all the forces acting on the object using vectors
- All forces are drawn from the object
- Represent the object with a dot
- Use “on-by” notation (on what? by what?)