Unit V - Force

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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

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Presentation Transcript

### 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?)