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Physical Science Take 10 Week # 4. Day #1 Question 1 At an amusement park, bumper car X moves at a speed of 2.5 m / s toward car Y, which is at rest,

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Presentation on theme: "Physical Science Take 10 Week # 4. Day #1 Question 1 At an amusement park, bumper car X moves at a speed of 2.5 m / s toward car Y, which is at rest,"— Presentation transcript:

1 Physical Science Take 10 Week # 4

2 Day #1 Question 1 At an amusement park, bumper car X moves at a speed of 2.5 m / s toward car Y, which is at rest, as shown in the diagram below : Car X collides with car Y. How does the momentum of each car change after the collision ? A. Car X s momentum increases, and car Y s momentum decreases. B. Car X s momentum decreases, and car Y s momentum increases. C. Car X s momentum is unchanged, and car Y s momentum increases. D. Car X s momentum is unchanged, and car Y s momentum decreases.

3 Day #1 Question 2 Two students are standing next to each other. One of the students throws a tennis ball forward toward a line 2.0 m away. At the same time, the second student throws a bowling ball in the same direction. Both balls take the same time to travel the 2.0 m. Only the second student feels a noticeable backward push when she throws her ball. Which of the following statements explains why only the second student feels a noticeable backward push ? A. The bowling ball exerts a much larger reaction force. B. The bowling ball undergoes a much larger acceleration. C. The bowling ball requires more force to overcome gravity. D. The bowling ball converts more inertia into kinetic energy.

4 Day #1 Answers 1. Car X collides with car Y. How does the momentum of each car change after the collision ? B. Car X s momentum decreases, and car Y s momentum increases. 2. Which of the following statements explains why only the second student feels a noticeable backward push ? A. The bowling ball exerts a much larger reaction force.

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6 Day #2 Question 1 The diagram shows the forces acting on a rock. The weight of the rock is 76 N. An upward force of 106 N is exerted on the rock. What is the net force acting on the rock ? A. 106 N upward B. 76 N downward C. 30 N upward D. 182 N downward

7 Day #2 Question 2 A car has an oil drip. As the car moves, it drips oil at a regular rate, leaving a trail of spots on the road. Which of the following diagrams the car continuously slowing down?

8 Day #2 Answers 1. What is the net force acting on the rock ? A. 30 N upward 2. Which of the following diagrams of the cars trail of spots shows the car continuously slowing down?

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10 Day #3 Questions 1. Which of the following is an example of velocity ? A. A ball has an instantaneous speed of 15 m / s. B. An object has a mass of 10.5 kg. C. A 1.0 kg object moves at 18 m / s. D. A student walks 2.0 m / s north. 2. Which of the following statements best explains why it is usually easier to keep a sliding object moving than it is to start the object moving ? A. Kinetic friction is typically equal to static friction. B. Kinetic friction is typically less than static friction. C. Kinetic friction is a force that resists attempts to start an object moving. D. Kinetic friction is a force that opposes the sliding of two objects over each other.

11 Day #3 Answers 1. Which of the following is an example of a velocity ? D. A student walks 2.0 km / s north. 2. Which of the following statements best explains why it is usually easier to keep a sliding object moving than it is to start the object moving ? B. Kinetic friction is typically less than static friction.

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13 Day #4 Question 1 Mike, who has a mass of 75 kg, is running north at 2.6 m / s. He collides with Tom, who has a mass of 125 kg and is not moving. Which of the following statements describes how much momentum each person has before the collision ? A. Mike has a momentum of 130 kg m / s north, and Tom has no momentum. B. Both Mike and Tom have a momentum of 130 kg m / s north. C. Mike has a momentum of 195 kg m / s north, and Tom has no momentum. D. Both Mike and Tom have a momentum of 195 kg m / s north.

14 Day #4 Question 2 The illustration shows an athlete participating in an Olympic hammer throw event. The athlete twirls the hammer ( a heavy steel ball attached to a wire ) around several times before releasing it. The diagram shows the path of the ball as it is spun in a circle before its release. Which arrow shows the direction of the centripetal force on the ball before the ball is released ? A. P B. Q C. R D. S

15 Day #4 Answers 1. Which of the following statements describes how much momentum each person has before the collision ? C. Mike has a momentum of 195 kg m / s north, and Tom has no momentum. 2. Which arrow shows the direction of the centripetal force on the ball before the ball is released ? D. S

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17 Day #5 Question 1 A cart with a mass of 5 kg rests on a floor next to a wall. A person pushes on the cart to the left toward the wall with a force of 100 N. Which of the following statements is true ? A. The wall does not push on the cart. B. The floor pushes 100 N up on the cart. C. The cart pushes 100 N down on the floor. D. The wall pushes 100 N to the right on the cart.

18 Day #5 Question 2 A performer pulls a tablecloth out from under a complete set of dinnerware. Which of the following best explains the performer s success at leaving all the dinnerware on the table ? A. the inertia of the dinnerware B. the large mass of the tablecloth C. the placement of the dinnerware D. the rough material of the tablecloth

19 Day #5 Answers 1. A person pushes on the cart to the left toward the wall with a force of 100 N. Which of the following statements is true in this situation ? D. The wall pushes 100 N to the right on the cart. 2. Which of the following best explains the performer s success at leaving all the dinnerware on the table ? A. the inertia of the dinnerware


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