![]() This boy pushes on his friend with a force of 25 N to the right. The velocity of this car is 100 m/s (magnitude) to the left (direction). Graphically, we represent a vector by an arrow. Vectors A quantity that requires both a magnitude (or size) and a direction can be represented by a vector. Which runner is moving faster? A Slide 1-22 The positions are shown at 1 s time intervals. Which runner is moving faster? Slide 1-21Īnswer Two runners jog along a track. Slide 1-25Ĭhecking Understanding Two runners jog along a track. Speed of a Moving Object 40 m m 1 s s 20 m m 1 s s The car moves 40 m in 1 s. Speed of a Moving Object O O O O O O O O O O Slide 1-25 She then undergoes a displacement ∆x = –50 m. Slide 1-17ĭisplacement The change in the position of an object as it moves from initial position xi to final position xf is its displacement ∆x = xf – xi. We are free to choose the origin of time (i.e., when t = 0). At each time t, the object is at some particular position. Position and Time The position of an object is located along a coordinate system. This model helps us concentrate on the overall motion of the object. Motion-The Particle Model A simplifying model in which we treat the object as if all its mass were concentrated at a single point. Almost all mammals from tiny shrews to huge elephants live about a billion heartbeats!.2.4 x 109 beats/lifetime Estimate - a typical heart beats ~60 times per minute:.Find the value of 6.49m divided by 5.1037s ĮSTIMATION Estimate the number of times a human heart beats during its lifetime.Zeroes written between digits are significant.Zeroes that are placeholders are not significant.Final ending zeroes written to the right of the decimal aresignificant.Nonzero digits are always significant.This is more easily written as 5.2910-11 m. When properly written this number will be between 1.0 and 10.0 Example: The radius of a hydrogen atom is 0.0000000000529 m. How can we keep track of all those zeros? Įxample The radius of the sun is 700,000 km.The nearest star, α Centauri, is 44 Quadrillion meters or 44,000,000,000,000,000 meters away.YouTube - Lion vs wildebeest - BBC wildlifeĪnimation: Mars Science Laboratory - JPL, NASA: Multimedia, videos, animations, High definition, clips, free downloads#fragment-5.There is more to lectures than the power point slides! 20, Nov 15 + Final Dec 13 =2 exams NO MAKE-UPS ![]() PHYSICS 101 ENERGY Physics Chemistry -Life
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