Watch and track your favorite playlist.
Curated by: Physics Made Easy (117 videos)
Via the resolution of an exam-like exercise, we will review together some fundamental pillars of high school mechanics: _ Conservation of Energy _ Impulse and Momentum _ Graphing Motion _ Forces and Newton’s Laws _ Friction Benefit of a private session with renown Physics Tutor, Edouard Reny. If you are experiencing trouble in applying what you have learned in mechanics at school, grab a pen, a calculator and some paper and follow the instruction in this video diligently: Most importantly, take your time, do not rush through it! After this, Mechanics should appear much clearer to you! This video is aimed at IB students studying HL or SL Physics. It can also help students preparing other diplomas (A-Levels, AP Physics, etc...) in getting their grips around mechanics. In this episode, we will be working on an exercise inspired by a past paper that deals with a block that is pushed up a ramp by the decompression of a spring. Pause the video and work it out by yourself. Then, we will review the exercise together. When relevant, I will remind the viewer on concepts required to solve the exercise. You can get free access to tons of free resources that will help you with your studies of high school physics by visiting the website: https://www.physics-made-easy.com/ Need a course about Forces (Mechanics)? Look no more! https://www.physics-made-easy.com/Course-Forces This video is produced and presented by Edouard Reny, Ph.D. in materials sciences and private tutor in Physics. He provides one-on-one private tuition in Physics (face to face or by Skype). If you wish to contact him, visit his website: https://www.physics-tutor.nl/ Please subscribe to get notified when new support video are posted! ***************** Text of the exercise ****************** ++++ CONTEXT ++++ Old Pinball game machines used a spring that the player would pull and release to launch the ball. Then a new generation of pinball machines came where the player just needed to press on a button to launch the ball. The principle was based on a motor compressing the launch spring that was then locked in a compressed position. Pressing the button would unlock the mechanism, and the ball would be launched. The ball would first slide on a frictionless flat surface for 80 cm and then climb a ramp and reach a height of 15 cm. A student modeled such a system by setting up an experiment described by the diagram (See Video): When the lock is released, a 500g block is accelerated by a spring, loses contact with it at point M and slides on a friction-less surface. When it reaches point N, it enters a friction-less ramp. At point P, the ramp ends at a height of 15 cm. ++++ QUESTIONS ++++ 1/ At point P the velocity of the block is 1.7 m/s. Determine the elastic energy stored in the spring when it is compressed and locked. (2 Marks) 2/ What will be the speed of the block at point M? (2 Marks) 3/ When the locking mechanism is released, the decompression of the spring lasts 0.31s. Calculate the average force that the spring exerts on the block. (2 Marks) 4/ Once the block is released, it follows the path MNP. 4a/ Referring to the appropriate Newton Law, describe the motion of the block from M to N (1 Mark) 4b/ Draw a Free body diagram of the ball when it is rising up the ramp. In another color draw on your FBD the resultant force on the block. (2 Marks) 4c/ Referring to the appropriate Newton Law, describe the motion of the block from N to P. (1 Mark) 4d/ Sketch a velocity time graph of the block. Using another colored pen, on the same graph, plot an approximate displacement-time graph. Label the graphs. (2 Marks) 5/ The student spreads some sand on the section MN in order to roughen the surface so that the dynamic coefficient of friction between the block and the surface becomes 0.3. Will the block make it up the ramp and reach point P? (4 Marks)