5 3 part 2 normal forcesfreebodydiagram davis bellringer

5. 3 part 2 normal forces/freebody-diagram davis

bellringer In your composition books answer these questions! 1. 3 people are pulling and pushing on 1 box. On the right side one person is applying 8 N of force. On the same side, opposite direction another person applies 3 N of force. On the left side the other person exerts 6 N force on the box in the opposite direction of the 3 N that is being added on the right side. What is the Net force? Which way will the arrow go? Is this a balanced or unbalanced force? 1. During 7 th period we put Fred in a box because he was talking too much. We still heard his voice through the box so we decided to push him outside. The force of friction of the ground on the box was 68 N left. Ms. Davis can apply a force of 25 N on the right and every other 8 th grade student can apply a force of 6 N to the right. How many students will Ms. Davis need to make the box start moving and go outside?

Normal force ● Normal force: a perpendicular force that a surface exerts on an object that is pressing on it. ● Created whenever an object is in contact with a surface ● Has equal strength to the force pressing the object into the surface ● Has opposite direction to the force pressing the object into the surface

Free-body diagram ● Contains only a SINGLE object ● All connections that supports the object are taken away and replaced by the forces they exert on the object ● Includes every force acting on an object : friction, weight, normal force