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KU PHSX 211 - Lecutre 7 (September 13) Reference Frame and Force Examples
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PHYSX211 1nd Edition Lecture 7 Outline of Last Lecture II. If a book is at rest on a table, then the teacher gives it a slight shove towards the right and the book slides to the right, which direction is the NET FORCE in?a. The NET FORCE goes to the left.b. This is because the motion towards the right is slowing down, thus accelerating towards the left.III. Sketch all the forces for the following:a. Elevator being suspended by a rope and moving down at a constant velocityi. Constant velocity means no acceleration so the FNet= 0, using the equation F=mab. Rocket being launched at a 30° angle from the horizontali. Thrust F goes in the opposite direction gas would be expelled from the rocketii. Drag F goes in the opposite direction of motionIV. From Newton’s perspective, which of the following resulted with a non-zero net force acting on the object? How about for Aristotle?a. Object is at resti. Neitherb. Object has constant velocityi. Aristotlec. Object is acceleratingi. Newton and AristotleOutline of Current Lecture I. Which of the following Examples are in an inertial reference frame?a. A car at constant velocity on level ground traveling straightb. A car at constant velocity up an incline of 10 degreesc. A car stepping on the gas as a stoplight turns greend. A car at constant speed traveling around in curvee. A balloon rising straight up at a constant velocityf. A skydiver just after he jumped out of a planeg. A space shuttle orbiting the worldII. If you have a ¾ of a circular tube (that would complete a full circle if all the tube was there) and you shoot a ball through the tube where would the ball travel as it exits the tube (assuming the tube doesn’t move)? These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.III. What forces are acting on a rock that is tossed from your hand at the moment after it has reached its highest point and has started to travel back down?Current LectureI. Which of the following Examples are in an inertial reference frame?a. A car at constant velocity on level ground traveling straighti. Yes, because the car is not accelerating(it’s speed or direction is not changing)b. A car at constant velocity up an incline of 10 degreesi. Yes, although the car is traveling at an angle it is in an inertial reference frame because the car is not accelerating(it’s speed or direction is not changing)c. A car stepping on the gas as a stoplight turns greeni. No, because the car is accelerating (its speed is changing)d. A car at constant speed traveling around in curvei. No, because the car is accelerating (its direction is changing)e. A balloon rising straight up at a constant velocityi. Yes, because the balloon is not accelerating(it’s speed or direction is not changing)f. A skydiver just after he jumped out of a planei. No, because the skydiver is accelerating towards the earthii. Note: once the skydiver has reached terminal velocity (the fastest speed afree falling object can have) he will be in an inertial reference frame assuming he is not changing directions because he has stopped acceleratingg. A space shuttle orbiting the worldi. No, because the space shuttle is accelerating (its direction is changing)II. If you have a ¾ of a circular tube (that would complete a full circle if all the tube was there) and you shoot a ball through the tube where would the ball travel as it exits the tube (assuming the tube doesn’t move)? Would it move:a. Follow the same path as it had in the same circular motion? b. Follow a circular path similar to before but more straight?BCAc. Follow a straight path out of the tube?d. The correct answer is CIII. What forces are acting on a rock that is tossed from your hand at the moment after it has reached its highest point and has started to travel back down?...Drag FrockGravity


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