●Describe the characteristics of a screw.
●Demostrate the use of a screws.
●Describe the characteristics and functions of pulley.
●Demostrate the use of a screws.
●Describe the characteristics and functions of pulley.
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● screw are designed to be fastened to an existing tapped hole on a metal surface, usually in conjunction with a corresponding nut.
● screw are used to hold things together as they pull or push the object.
●The function of a pulley is to lift heavy objects by changing the direction of the force on a flexible cable.
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