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# Unit V - Force PowerPoint PPT Presentation

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

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

• Static friction, Ffs

• When the object isn’t moving

• Kinetic friction, Ffk

• 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.

### Normal force

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

### Force Diagrams

• 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?)