You can check and change them later.
A full topic quiz typically takes between 15 and 30 mins - micro quizzes mins. KS3 Physics U. Age Test yourself : On-line revision questions Want to check on your progress so far? What grade are you on at the moment? How does this site work? Quick Quiz Questions on How it works: This is a free site! Registration is optional. At the end of each revision quiz you can either submit your name , school and a few other details and the scores will be marked and graded , and then sent to your school.
Like an on-line homework. The total mechanical energy i. The answer is B.
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The PE is a minimum when the height is a minimum. Position B is the lowest position in the diagram. The answer is C. Since the total mechanical energy is conserved, kinetic energy and thus, speed will be greatest when the potential energy is smallest. Point B is the only point that is lower than point C. The reasoning would follow that point B is the point with the smallest PE, the greatest KE, and the greatest speed.
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Therefore, the object will have less kinetic energy at point C than at point B only. Many drivers' education books provide tables that relate a car's braking distance to the speed of the car see table below. Utilize what you have learned about the stopping distance-velocity relationship to complete the table. The car skids m.
Thus, there must be a nine-fold increase in the stopping distance. Multiply 15 meters by 9. Two baseballs are fired into a pile of hay. If one has twice the speed of the other, how much farther does the faster baseball penetrate? Assume that the force of the haystack on the baseballs is constant. When there is a two-fold increase in speed, there is a four-fold increase in stopping distance. For constant resistance forces, stopping distance is proportional to the square of the speed.
Use the law of conservation of energy assume no friction to fill in the blanks at the various marked positions for a kg roller coaster car. If the angle of the initial drop in the roller coaster diagram above were 60 degrees and all other factors were kept constant , would the speed at the bottom of the hill be any different? The angle does not affect the speed at the bottom of the incline. The speed at the bottom of the incline is dependent upon the initial height of the incline.
Many students believe that a smaller angle means a smaller speed at the bottom. But such students are confusing speed with acceleration. A smaller angle will lead to a smaller acceleration along the incline.
An object which weighs 10 N is dropped from rest from a height of 4 meters above the ground. Energy is conserved in free-fall situations no external forces doing work. Thus, the total mechanical energy initially is everywhere the same. Whatever total mechanical energy TME it has initially, it will maintain throughout the course of its motion. The object begins with Observe that a confusion of mass 1 kg and weight 9. During a certain time interval, a N object free-falls 10 meters. The total amount of mechanical energy is conserved in free-fall situations no external forces doing work.
Thus, the potential energy that is lost is transformed into kinetic energy. A rope is attached to a A diagram of the situation and a free-body diagram are shown below. Note that the force of gravity has two components parallel and perpendicular component ; the parallel component balances the applied force and the perpendicular component balances the normal force. Both gravity and applied forces do work. The normal force does not do work since the angle between F norm and the displacement is 90 degrees.
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If necessary, review the lesson on work. Based upon the types of forces acting upon the system and their classification as internal or external forces, is energy conserved? The applied force is an external or nonconservative force. And since it does work, the total mechanical energy is not conserved.