ILQ 1Lecture 6Purdue University, Physics 1492If the distance to the moon were halved, then the force of attraction between the earth and moon would be:A) quartered (.25 x)B) halved (.5 x)C) doubled (2 x)D) quadrupled (4 x)
Normal (= Perpendicular) Force•The normal force is a contact force perpendicular to the contact surfaces that prevents two objects from passing through each other.•Normal force is a vector.– Direction: always perpendicular to the “contact surface” (rather than the horizon)– Magnitude: depends on the weight of the object (see different cases on next pages)•Type: contact force (not a long-range force)•Normal force is usually denoted by N.Lecture 63Purdue University, Physics 149
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Normal Force•Symbol for FBD: N•Type: Contact force•Direction is normal (perpendicular) to surface•This is the normal component for the contact force between two (planar) surfacesLecture 64Purdue University, Physics 149