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Aim: How can we define torque and rotational motion

What makes something rotate in the first place?. TORQUE. AXEL. . . . . How do I apply a force to make the rod rotateabout the axel? Not just anywhere!. . . . . TORQUE. To make an object rotate, a force must be applied in the right place.The combination of force and point of application is called

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Aim: How can we define torque and rotational motion

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    1. Aim: How can we define torque and rotational motion?

    2. What makes something rotate in the first place?

    3. TORQUE To make an object rotate, a force must be applied in the right place. The combination of force and point of application is called TORQUE

    5. Units The units are Nm In energy, this is a Joule Torque is not energy, therefore we do not refer to the unit as a Joule. We leave it as a Nm

    6. Torque example

    7. Net Force = 0 , Net Torque ? 0

    8. Net torque = 0, net force ? 0

    9. Torque Torque that tend to cause clockwise rotation are negative (-) Torque that tend to cause counterclockwise rotation are positive (+)

    10. Balancing torques

    11. Mass of Board The weight is located at the center for a uniform material This weight can also produce a torque if the center is not the pivot point

    12. Equilibrium To ensure that an object does not accelerate or rotate two conditions must be met: ? net force = 0 ? net torque = 0 this results in the practical 4-1 ladder rule

    13. Conditions for Equilibrium

    14. When is an object stable? If you can tip it over a bit and it doesnt fall The object may wobble a bit but it eventually stops and settles down to its upright position.

    15. Why things fall over Every object has a special point called the center of gravity (CG). The CG is usually right smack in the center of the object. If the center of gravity is supported, the object will not fall over. You generally want a running back with a low CG? then its harder to knock him down. The lower the CG the more stable an object is. stable ? not easy to knock over!

    16. Condition for stability

    17. when does it fall over?

    18. Stable and Unstable

    19. Stable structures

    20. Playing with your blocks

    21. Object with low CG

    23. The shape of an object determines how easy or hard it is to spin

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