SECOND QUARTER Its second quarter time Lets continue

SEATS AND EXAMS First to your new seats Then your exams (look at, not

LETS GRAB A VOTING DEVICE Draw this situation in your notebook, call it: NET

VOTE ON: Is there an imbalance here? A) Yes, and its LEFT because the

VOTE ON: Is there an acceleration here? A) Yes, and its LEFT because the

VOTE ON: How would you find the acceleration A) Find the amount of imbalance,

DO IT AS A GROUP, Do the work in your notebook, vote on the

LETS TRY You pull a 12 kg box right with 14 N. It accelerates

VOTE ON: Is there an imbalance here? A) Yes, and its to the right

VOTE ON: How A) do you find the imbalance? Use net force = ma,

VOTE ON: How much imbalance is there? Send in a number WITH + for

VOTE ON: Is there another force acting in this system? A) No, the 14

C! Idea: There is an imbalance of 24 N right. There is only

Solve for how much force we need to add to make this happen.

TIME TO MEET THE FORCES Newtons laws work anywhere, even outer space. In outer

EVEN IN SPACE It all ties in together. Water in space…

WEIGHT Force of the EARTH on an object. Called Weight: Symbol: Equation: Direction: Unit:

EXAMPLE: A cat is 8 kg. How much is it’s weight?

VOTE ON: The cat goes into outer space…. which is true? A) The weight

YOU START: For the math problems on the HW, start by reading EACH ONE,

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SECOND QUARTER! Its second quarter time! Lets continue on with Forces, but first

SEATS AND EXAMS First to your new seats Then your exams (look at, not keep yet)

LETS GRAB A VOTING DEVICE Draw this situation in your notebook, call it: NET FORCE EXAMPLE. This mass is moving right currently at 4 m/s. 7 Newton's 2 kg 3 Newton's

VOTE ON: Is there an imbalance here? A) Yes, and its LEFT because the left force is greater B) Yes, and its RIGHT because it is still moving right C) No, its balanced because the left force is balanced by the right velocity

VOTE ON: Is there an acceleration here? A) Yes, and its LEFT because the imbalance is left B) Yes, and its RIGHT because it is still moving right C) No, its zero because its at a constant velocity

VOTE ON: How would you find the acceleration A) Find the amount of imbalance, that is the acceleration B) Find the amount of imbalance, set it equal to ma C) Find the amount of imbalance, use with Vi is 4 m/s to get a.

DO IT AS A GROUP, Do the work in your notebook, vote on the magnitude of the acceleration: A) 4 m/s 2. B) -4 m/s 2. Because opposite the motion C) 2 m/s 2. D) -2 m/s 2. Because opposite the motion E) 0 m/s 2.

LETS TRY You pull a 12 kg box right with 14 N. It accelerates right at 2 m/s 2. Lets start with a pic:

VOTE ON: Is there an imbalance here? A) Yes, and its to the right B) Yes, and its to the left C) No, its balanced

VOTE ON: How A) do you find the imbalance? Use net force = ma, then add 14 to it. B) Use net force = ma, then subtract 14 to it. C) Use net force = ma, that’s it

VOTE ON: How much imbalance is there? Send in a number WITH + for right, for left.

VOTE ON: Is there another force acting in this system? A) No, the 14 N is the only force creating the net force B) Yes, and its left to reduce the net force to 14 N C) Yes, and its right to add more right force to get 24 N

C! Idea: There is an imbalance of 24 N right. There is only 14 N right so far, so we need more RIGHT force to get it to 24 N.

Solve for how much force we need to add to make this happen.

TIME TO MEET THE FORCES Newtons laws work anywhere, even outer space. In outer space, we are in micro-gravity don’t you mean zero gravity? So you are working on the ISS, and you turn a valve clockwise. What happens to you? Yeah, you get it. NASA didn’t at 1 st

EVEN IN SPACE It all ties in together. Water in space…

WEIGHT Force of the EARTH on an object. Called Weight: Symbol: Equation: Direction: Unit:

EXAMPLE: A cat is 8 kg. How much is it’s weight?

VOTE ON: The cat goes into outer space…. which is true? A) The weight on the cat and the mass of the cat don’t change B) The weight on the cat and the mass of the cat both change C) The weight on the cat changes and the mass of the cat stays the same D) The weight on the cat stays the same and the mass of the cat changes

YOU START: For the math problems on the HW, start by reading EACH ONE, then drawing a FBD as a dot…