11.1 Distance and Displacement Choosing a Frame of Reference The motion of an object looks different to observers in different frames of reference. EX: A passenger in the rear seat of a car moving at a steady speed is at rest relative to the front seat of the car. But is not at rest relative to: the side of the road‚ a pedestrian on the corner ahead‚ or even the rotating wheels of the car. EX: Examine the figure. If you were standing under the tree‚ which object would appear to be moving
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difference was fairly significant. This happened because of friction‚ when the two pucks collided‚ they have lost a bit of their momentum‚ so the momentum after the collision differed. Kinetic energy differed more than what was expected‚ it was significantly less after the collision‚ the difference before and after the collision was 63.7%‚ so 36.3% of that momentum was lost. This have occurred because the collision is inelastic and since there was friction when the two pucks collided‚ their speed became less
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such example is seen in Jacob wrestling with God from night till daybreak in Genesis 32:22-32. At the basic levels of wrestling‚ one must learn how to perform a takedown. The takedown requires the application of physics’ principles such as momentum‚ friction‚ gravity‚ and even momentum. Momentum is a vector quantity‚ meaning that it needs a magnitude and direction‚ and this expression is mathematically defined as p=mv. The momentum is equal to the mass times velocity. In wrestling‚ two colliding wrestlers
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and Properties of Matter : Introduction to dynamics: circular motion; simple harmonic motion (SHM); rotation of rigid bodies; Newton’s Law of gravitation Introduction to statics: force systems on rigid bodies at rest: equilibrium: fluid statics. Introduction to properties of matter: elasticity in solids‚ viscosity in fluids‚ friction. Sound and Vibration: Introduction to Sound: Wave phenomenon; sound waves; velocity of sound. Introduction of vibration: Free vibrations of particles (SHM). Simple pendulum;
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speed as GPE is transferred to kinetic energy (KE). As it travels to the top of another loop‚ KE is transferred to GPE. Not all the energy is transferred to or from GPE – some is transferred to the surroundings as heat and sound. All moving objects have kinetic energy‚ KE. The kinetic energy an object has depends on the mass and speed. If the mass doubles‚ the KE doubles and if the speed doubles‚ the KE quadruples. Normally energy is lost through sound and heat (friction‚ air resistance). How the
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would slow down the initial acceleration‚ but the car would travel a longer distance due to increased momentum‚ which might overcome kinetic friction. Rationale: Some reasons of why that it was thought that the more weight added to the car would increase the overall distance travelled is because in order to stop the Lego car with an example of 40g in it‚ kinetic friction and the force of gravity will have to work harder to slow the car down‚ due to Newton’s law of motion. “Objects in motion tend to
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pressure drop The head loss‚ and The pumping power requirement to overcome this pressure drop. (i) (iD (iiD ( Q3. (a) l5 marks) Describe how is friction factor for flow in a pipe related to the pressule loss for a giveo mass flow rate. (6 marks) (b) Consider laminar flow ofair in a circular pipe with perfectly smooth surfaces. Do you think the friction factor for this flow is zero? Explain your answer. (6 ma*s) (c) A
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head loss and velocity loss. After finding out the data‚ the measured values of the static pressure head for each increasing flow rate is compared with the theoretical value‚ calculated by the Bernoulli’s equation. The head loss is also found by measuring the 8th manometer on the manometer panel whose difference each time will give the head loss. The difference between the measured and theoretical value of static head is then found out to be due to the frictional losses
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something called an elastic collision occurs. An elastic collision is defined as “when the total kinetic energy of two objects before a collision is equal to the total kinetic energy of the two objects after the collision” (). So the total kinetic energy is the same after the soccer ball hits the players head as it was before it did. If the soccer ball hits a players head while it is at rest‚ a portion of the kinetic energy is transferred over to the players head since it was at rest. This is why soccer
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1. A book is at rest on a tabletop. A free-body diagram for this situation looks like this: Return to Questions Return to Info on Free-body diagrams Return to on-line Force Description List 2. A girl is suspended motionless from the ceiling by two ropes. A free-body diagram for this situation looks like this: Return to Questions Return to Info on Free-body diagrams Return to on-line Force Description List 3. An egg is free-falling from a nest in a tree. Neglect air resistance. A
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