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Reader questions and feedback on physical science. Also refer to physics, chemistry, astronomy, electricity, magnetism, electromagnet, light, sound, waves, forces, work, energy, friction, heat, thermodynamics, Ron Kurtus, School for Champions. Copyright © Restrictions Answers to Readers' Questions on Physical Science:MotionThe following 36 comments and questions have been sent in. They are listed according to date. List of first 10 items
Is a passenger in a moving car moving too?QuestionOctober 15, 2009 If there is a passenger seated in a car that is in motion, is the passenger also in motion? Or is the passenger considered not to be in motion? - USA 18511 AnswerThe passenger is not in motion with respect to the car. But the person is in motion with respect to some bystander who is not moving. Find the stopping distance of a moving objectQuestionOctober 14, 2009 A particle of mass 2g moving at 50m/s is stopped by a frictional force of 100N.Find the stopping distance? Simon - Kenya 18500 AnswerA newton is a kg-m/s^2. That means you must change the mass to kg. 2g = 2/1000 kg. What are the definitions of the following words?QuestionOctober 14, 2009 What are the definitions of the following; distance, displacement and average speed? Simon - Kenya 18499 AnswerYou should be able to look up those words in any dictionary. Can a velocity-time graph have a V shape?QuestionAugust 15, 2009 is this graph is possible: that velocity-time graph has v shape? - USA 18154 AnswerAlthough time remains constant, the velocity can change. The velocity can start high and then slow down until some time when it starts to increase again. That would be a "V" shape. What is the difference between speed nd velocity?QuestionAugust 3, 2009 I just want to know the difference between speed and velocity and please elaborate Elias - South Africa 18096 AnswerThe velocity of an object is its speed when you also tell the direction. What is the difference between motion and relative motion?QuestionJuly 31, 2009 What is the difference between motion and relative motion? prakash - India 18086 AnswerAll motion is relative to an observer or point of reference. A person next to you on a train may not seem to be in motion with respect to you. However, an outside observer will see both of you moving along with the train. Velocity of the EarthQuestionJune 18, 2009 hey there,i didnt get the answer for this question, can u please help :the distance of the earth from the sun is 93 000 000 miles.if there are 3.15times 10to the power 7 seconts in one year,find the speed of the aerth in its orbit about acceleration chokwe - South Africa 17922 AnswerIf you assume the orbit of the Earth around the sun is a circle, then its circumference would be 2 X 3.14 X 93 000 000 miles. If there are 3.15 X 10^7 seconds in a year (which means the Earth went a full orbit), then the speed would be 584040000/3.15 X 10^7 miles per second Difference between motion and relative motionQuestionMay 26, 2009 hi sir, my name is waris. MUHAMMAD - Pakistan 17803 AnswerAll motion is relative to something else. If you see an object moving, it is moving relative to you. But someone who is walking along may view the object as moving at a different speed relative to him. Studying relative motionQuestionApril 16, 2009 How do we study the relative motion easiar? Lahiru - Sri Lanka 17611 AnswerAll motion is relative to something else. Usually, you measure motion with respect to the ground, since it seems fixed. But if you are walking inside a moving train, you are moving at one speed relative to the floor of the train, but you are moving at another speed relative to the ground, because it adds your waling speed and the speed of the train. How long for a soccer ball to hit the ground?QuestionJanuary 20, 2009 Marshall stands on a platform and kicks a soccer ball from 6 m above the ground vertically upwards into the air with an initial velocity of 4m.s. The ball hits the ground after 1.6 seconds. Amos - South Africa 17125 AnswerThis is a problem concerning moving a ball upwards against the force of gravity. You can see the equations on this type of problem in "Gravity Equations for Upward Motion" at: SummaryHopefully, this reader feedback has helped provide information about Science issues. ResourcesThe following are some resources on this topic. WebsitesBooks
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