Do Now Heading: Newton’s 3rd Law

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Do Now Heading: Newton’s 3rd Law Pick up worksheets from the front table Turn in the lab if you did not yesterday Copy the heading into your table of contents Copy the homework into your homework log

The Rock Slide Two big rocks are rolling towards Hoover High. Rock A has a mass of 15 kg and is rolling with a velocity of v = 20 m/s. Rock B has a mass of 20 kg, and is rolling with a velocity of v = 15 m/s. Which rock do you think would be harder to stop before it hits the school? Answer with at least 3 complete sentences and a drawing to help support your claim.

Today’s Vocabulary INERTIA

So what happens when you are trying to stop this boulder?

Newton’s 3rd Law For every action, there is an equal and opposite reaction. Every time you exert a force on an object, it exerts a force back on you!

Solving for Normal Force in a Balanced System A box is sitting at rest on a table We first need to identify all of the forces acting on the box Then we need to draw the FBD with all of the forces acting on the box We need to determine if this is a balanced or unbalanced system Solve for the Normal Force

Solving for Normal Force in a Balanced System A 2 kg ball is dropped into your hand. The ball is accelerating downward at 1 m/s2 . We first need to identify all of the forces acting on the box Then we need to draw the FBD with all of the forces acting on the box We need to determine if this is a balanced or unbalanced system Solve for the Normal Force