Aim: How do we define equilibrium in a system?

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Presentation transcript:

Aim: How do we define equilibrium in a system? Do Now: Define equilibrium HW: Problem Set 1, Q-1 & 2

Equilibrium Object is at Rest Object is moving at constant speed in a straight line.

Demo 1 Block in air “Force” “Force” Spring scale Spring Scale “Not Moving” ***Is the block at equilibrium? YES!!! It’s not moving! Two students do this

4 Steps for Equilibrium Problem Draw a Free Body Diagram Write that the “Up Force = Down Force” & “Left Force = Right Force” Write Newton’s Second Law in all directions Solve for Unknown Draw free body diagram from last demo F1 is force of person on block, F2 is force of person on block

Demo 2 Block in air Force 2 Force 1 Force 3 ***Is the block at equilibrium? YES!!! It’s not moving! Let 3 students do this and solve for one left out force. After math is done, show physics works! F1 = F2 + F3

Demo 3 Block on Table Draw Free Body Diagram and label forces Block is in contact with something, so there must be a force! Block is in contact with something, so must be a force. Weight = force of earth on block. (wont get right away) Fn = Force of table on block

Summary Solve for the forces described using the 4 Step Method!

A Block resting on a table is pushed down on with a force of 10 N, but is also being pulled on to the right by two people with a force of 12 N and pulled on to the left by one person. The block is not moving. What forces will make the statement true? Draw a diagram to help explain!

Summary What does it mean to be in equilibrium? What form of measurement do we use? What is Newton’s Second Law?