Day 8 of 3rd Quarter 1) Talk about HW 2) Probs 3) New topic at end.

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Presentation transcript:

Day 8 of 3rd Quarter 1) Talk about HW 2) Probs 3) New topic at end

When you leave here today You will know how to relate motion in a circle to Newton’s Laws. You will know the difference between CENTRIPEDAL motion and TANGENTAL motion

HW Answers online, How can I help you out with this?

ON WATCH Quiz on all topics: Ballistic Pendulums Pendulums Gravitation/Gravity Springs Orbits Fri 10th /Mon 13th

PARTNERS

Here a satellite is orbiting in an ellipse and is measured from the Earth’s center. We want to find the velocity at the ? in terms of the variables given AND the earths mass Me.

Please create a table of values at R1 and R2

Is the work here + - or 0

What is the work done on the satellite here 0, + or -

Curved track in the hall

Statements: You can have an acceleration even if the magnitude of the velocity is constant. T/F?

Statements: You can have an acceleration even if the magnitude of the velocity is constant. TRUE! If the direction changes, there is an acceleration!

Statements: You need an imbalance of forces in order to change the direction of an objects motion T/F?

Statements: You need an imbalance of forces in order to change the direction of an objects motion TRUE! Newton's 1st law states that stuff keeps doing what its doing until an imbalance occurs

Question: Remember Orbits So for something going in a CIRCLE, or in a CIRCULAR CURVE, which way must the imbalance be?

Question: Remember Orbits So for something going in a CIRCLE, or in a CIRCULAR CURVE, which way must the imbalance be? Towards the center of the circle!

TANGENTAL ACCELERATION changes amount CENTRIPEDAL ACCELERATION changes the direction ONLY FOR CIRCLES

Do these 2 accelerations affect each other? NO, because they are 90 degrees to each other (X and Y independence) FOR CIRCLES ONLY, elliptical orbits are different

From points A to E, there is negative work done (SLOWING). From E to A, there is positive work done (SPEEDING UP)

PLEASE WRITE A SENTENCE EXPLAINING THE WORK DONE ANOTHER WAY… From A to E, part of the velocity is opposite the direction of force which is a negative work This is an ISOLATED system, so from A to E the GRAVITATIONAL ENERGY is going up (farther from Earth), so KE decreases which is a negative work