Net Force Adding force vectors.

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Presentation transcript:

Net Force Adding force vectors

Net Force Forces are vectors. Forces on an object add together. Forces can oppose each other. Net force is the vector sum of all forces acting on a body. The net force on a body at rest is zero.

Hammock Example 8 m 1 m weight F A hammock slung between trees 8 m apart sags 1 m when a person lies in it. The net force acting on the person is Equal to the weight of the person. Equal to the tension in one cable. Zero. There is not enough information to answer.

Working with Commonly-Encountered Forces Tension

Tension Forces In cables, threads, chains, etc. Direction: along the cable, inward

Hammock Tension 8 m 1 m weight F A hammock slung between trees 8 m apart sags 1 m when a person lies in it. The tension in one cable is Equal to the weight of the person. About half the weight of the person. Zero. Much more than the weight of the person. There is not enough information to answer.

Hammock forces Tension is the same direction as rope stretch: 4 horizontal: 1 vertical Add up the vectors! 4 1 Here, tension is over twice the weight! 2

Hammock Forces forces add to zero weight tension forces add to zero Tension exceeds weight for a shallow angle!

Application: Lumbar Forces Spinal curvature standing sitting

Application: Lumbar Forces Reaching with a load weight weight standing sitting

Application: Lumbar Forces Standing load support tension

Application: Lumbar Forces Sitting load support tension huge!