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Friction

Day 32
by

Summer Roland

on 17 July 2014

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Transcript of Friction

Day 32 - Friction
What did you do to move the heavy masses?



What is the scientific word for a push or pull?


Did it always take the same amount of force to move the masses? Explain.
Pushed and pulled them with the pusher.
A force.
More force was needed to move greater masses.
Did the masses always move when you exerted force on them?


When didn't they move?



Can a mass move when two people exert force on opposite sides of a sled?
No.
When equal forces were exerted on the mass in opposite directions, it didn't move.
Yes.
When does that happen?



If a force of 3 N pushes on one side of a mass and another force pulls with 3 N on the same side of the mass, will it move?



Why do you think that?
When one force is stronger than the other, the mass will move toward the weaker force, or when one pushes and the other pulls.
The mass will not move.
The 3 N push is canceled out by the 3 N pull.
If a force of 3 N pushes on one side of a mass and another force pulls with 3 N on the opposite side of the mass, will it move?




Why do you think that?
The mass will move.
The 3 N push and the 3 N pull are acting in the same direction, adding up to 6 N. The mass will move toward the puller.
Today we are going to find out how much force it takes to lift this load of washers.
We will use a workbench with a pulley fixed to one end.
With the load on the floor, and a string passing from the load up through the pulley and across to a spring scale, we can apply force and lift the load.
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