What’s Your Wager? Motion Style!

What’s Your Wager? • You will start with $1000. • You will wager an amount of money before you hear the question (like Final Jeopardy) • Answer the question… - if you are correct, add the waged amount to your total score - if you are not correct, subtract the waged amount from your total score • You must wager at least $100 for each question. • You can ONLY wager $100 if you are at $100 or less (like zero). GOOD LUCK!

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How do you know when something has moved? Question #1: How do you know when something has moved?

How do you know when something has moved? Question #1: How do you know when something has moved? You know something has moved if it has changed its position or location based on a fixed reference point.

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Question #2: What is a force?

mean that there will be motion. Question #2: What is a force? A force is a push or a pull exerted on an object. It can cause an object to move, if it is not balanced by an equal and opposite force. Just having a force does not automatically mean that there will be motion.

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While you are sitting in your seat, what forces are acting on you? Question #3: While you are sitting in your seat, what forces are acting on you?

While you are sitting in your seat, what forces are acting on you? Question #3: While you are sitting in your seat, what forces are acting on you? Gravity and the force of the chair/ground holding you up (called a normal force). Since you are sitting still, the two forces acting on you are balanced.

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What are the effects of an unbalanced force on an object? Question #4: What are the effects of an unbalanced force on an object?

The motion of the object changes Question #4: What are the effects of an unbalanced force on an object? The motion of the object changes (slows down, speeds up, changes direction, etc.)

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What two quantities are needed to measure SPEED? Question #5: What two quantities are needed to measure SPEED?

Speed is calculated using distance and time. Formula: S = D / T Question #5: What two quantities are needed to measure speed? Speed is calculated using distance and time. Formula: S = D / T

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Question #6: Give an example of a situation when a force is exerted, but no motion occurs.

Question #6: Give an example of a situation when a force is exerted, but no motion occurs. An example of this would be pushing on the wall. The force you exert is not greater than the force of the wall standing still, so no motion occurs.

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Question #7: Why is it important to know the direction of a force being applied to an object?

+ Forces working together + - Forces working against each other - Question #7: When you know the direction of the force being applied, you can accurately calculate the net force on the object, therefore predicting its motion (or lack of). Remember… + Forces working together + - Forces working against each other -

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Question #8: You are traveling in a car to school. The average speed of the car is 30 mph. To your mom (who is driving), you are sitting still. Are you really?

as a reference point, you are moving 30 miles in an hour. Question #8: You are traveling in a car to school. The average speed of the car is 30 mph. To your mom (who is driving), you are sitting still. Are you really? It depends on your reference point. When compared to your mom, you aren’t moving. However, if you use your house as a reference point, you are moving 30 miles in an hour.

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Question #9: What would be the result of two unbalanced forces acting on each other?

(in the direction of the stronger force) Question #9: What would be the result of two unbalanced forces acting on each other? A CHANGE IN MOTION ! (in the direction of the stronger force)

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Question #10: You ride your bike to school, and it takes you 4.5 minutes to get to school… You travel the exact same path home from school, but you notice that it takes you 4 minutes to get home. What does that tell you about the average speed you had going compared to coming home?

Question #10: Your speed must have increased going home (maybe you were more awake), since you traveled the same path in a faster time.

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Question #11: Describe the motion of an object that has balanced forces acting on it.

Question #11: ANSWER: If the forces acting on the object are balanced and the object is moving, it must be moving at a constant speed.

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Question #12: True or False? A car traveling on ice experiences more friction than a car traveling on a “normal” road.

Ice creates less friction (which is why it is so slippery). Question #12: True or False: A car traveling on ice experiences more friction than a car traveling on a “normal” road. FALSE! Ice creates less friction (which is why it is so slippery).

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Question #13: As a balloon car traveled across the floor, it started to curve. What caused the car to change direction (from traveling in a straight line to curving) ?

cause the change to the car. Question #13: The forces acting on the car changed direction, causing the motion of the car to change. Since the applied force (balloon or mousetrap) is the strongest (and causing the motion), it had to have been a change to this force to cause the change to the car.

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Complete this sentence… Newton is a unit of measurement of __ . Question #14: Complete this sentence… Newton is a unit of measurement of __ .

Complete this sentence… Newton is a unit of measurement of FORCE . Question #14: Complete this sentence… Newton is a unit of measurement of FORCE .

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If time remains constant, Question #15: If time remains constant, and distance increases as an object moves, what would you expect to happen to the object’s speed?

Speed increases as distance increases if time remains the same. Question #15: If time remains constant, and distance increases as an object moves, what would you expect to happen to the object’s speed? Speed increases as distance increases if time remains the same.

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Question #16: If you have two or more forces interacting, you can calculate the overall force in the situation, thus predicting the resulting motion. What is this overall force called?

The result is called the net force. Question #16: If you have two or more forces interacting, you can calculate the overall force in the situation, thus predicting the resulting motion. What is this overall force called? The result is called the net force.

PLACE YOUR WAGER! There are 2 parts to the next question, so you car earn ½ of your wager for each part.

Using the following distance vs. time, graph, answer questions a & b. What color graph shows a object that has stopped motion? What color line shows the fastest speed away from a reference point?

Question #17: What color graph shows a object that has stopped motion? What color line shows the fastest speed away from a reference point? Green b. Red

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Why do they have different perspectives about what happened? Question #18: A mom and a dad are watching their daughter in a track meet. The mom is standing right on the finish line, and the dad is sitting in the bleachers, far ahead of the starting line. As the runners finish the race, the mom sees that their daughter crossed the finish line first. But then mom notices that the dad is disappointed. He must think that the daughter lost the race. Hmmm… Why do they have different perspectives about what happened?

Question #18: Mom and dad have different perspectives because they have different positions from which they are judging the motion of the runners. In this case, the mother’s perspective is more accurate, since she has a better (closer to the finish line) perspective from which to judge the motion of the runners.

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Complete this statement… Question #19: Complete this statement… When the forces acting on an object are balanced, you can expect to see _____________ .

the motion remain as is/no change in motion Question #19: Complete this statement… When the forces acting on an object are balanced, you can expect to see the motion remain as is/no change in motion (if it is moving, it will keep moving; if not, it won’t start).

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Friction always works __ motion. Question #20: Friction always works __ motion.

Friction always works AGAINST (opposite direction of) motion. Question #20: Friction always works AGAINST (opposite direction of) motion.

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Which is a measurement of speed? Question #21: Which is a measurement of speed? 12 mph north 3 meters 4 hours 2.9 m/s

Which is a measurement of speed? Question #21: Which is a measurement of speed? 12 mph north 3 meters 4 hours 2.9 m/s

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Calculate the net force in this diagram: Question #22: Calculate the net force in this diagram: 35 N 100 N 40 N

Calculate the net force in this diagram: Question #22: Calculate the net force in this diagram: 35 N 100 N 40 N Net Force = 25 N to the left

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Name four forces acting on a skier traveling down a hill. Question #24 Name four forces acting on a skier traveling down a hill.

Name four forces acting on a skier traveling down a hill. Question #24 Name four forces acting on a skier traveling down a hill. Gravity (pulled down) Normal force of the mountain (working against gravity) Applied force (initial force pushing you down the mountain) Air resistance Friction (between your skis and the mountain)

…how well do you remember LAST QUESTION! PLACE YOUR WAGER …how well do you remember this concept???

Where does the ball have the greatest amount of potential energy? LAST QUESTION: Where does the ball have the greatest amount of potential energy? A B ramp C

The ball has the greatest potential energy at position A! LAST QUESTION: The ball has the greatest potential energy at position A! A B ramp C