Multiple Choice Question 6.31 A 1000-kg car moving at 10 m/s brakes to a stop in 5 s. The average braking force is 3000 N 5000 N 2000 N ***(answer) 1000 N 4000 N Force = mass x acceleration. Acceleration = velocity/time = -10/5 = -2 m/s/s. (- sign means a deceleration from velocity of 10 to 0) Force = 1000 x -2 = -2000 Newtons (i.e. 2000N in opposite direction to motion) Multiple Choice Question 6.11 When you jump from an elevated position you usually bend your knees upon reaching the
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collisions. This background knowledge is essential in understanding the experiment‚ resulting calculations‚ and analysis. The main objective of this experiment was to determine the initial velocity of a ball shot from a spring loaded gun‚ into a receptacle which traveled up a ramp. As well as finding the initial velocity of the ball we also wanted to determine the spring constant of the spring used in the spring loaded gun. Lastly‚ we wanted to analyze what speed would theoretically be reached if no
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car starting from rest‚ accelerates for 15.0 min until it’s velocity is 20 m/s. It then moves at constant velocity for another 20.0 min before it slow down and finally stopped in another 10.0 min. Find (a) acceleration during the first 15 min‚ (b) the deceleration during the last 10 min of its motion‚ (c) the distance traveled during the last minute‚ and the (d) total displacement. (e) Draw the displacement versus time graph and velocity versus time graph for the motion of the car. Given:
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high speed and covers a relatively large distance in a short amount of time. * Velocity: Velocity is a vector quantity that refers to "the rate at which an object changes its position." When evaluating the velocity of an object‚ one must keep track of direction. It would not be enough to say that an object has a velocity of 55 mi/hr. One must include direction information in order to fully describe the velocity of the object. * Distance: Distance is a scalar quantity that refers to "how
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07X1VW5 I‚ 2013 SUMMATIVE ASSESSMENT – I‚ 2013 / SCIENCE IX / Class – IX 3 90 Time Allowed : 3 hours Maximum Marks : 90 General Instructions : The question paper comprises of two Sections‚ A and B. You are to attempt both the sections. All questions are compulsory. All questions of Section-A and all questions of Section-B are to be attempted separately. 1 3 Question numbers 1 to 3 in Section-A are one mark questions. These are to be answered in one word or in one sentence. 4 6 30-30 Question
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Prandtl’s mixing length theory . . . . . . . . . . . . . . . . . . . . . . . . . Fluid shear stress and friction velocity . . . . . . . . . . . . . . . . . . . . Classification of flow layer . . . . . . . . . . . . . . . . . . . . . . . . . . . Velocity distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 4 5 7 9 Ch´zy coefficient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 e Drag coefficient
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inclined plane. To measure the instantaneous velocity and to determine the acceleration of the cart from the slope of the velocity-time graph. Theoretical Background A cart moving down a smooth incline speeds up. This is a simple case of a uniformly accelerated motion in one dimension. The rate of change of velocity is constant or uniform. The rate of change of velocity is called acceleration. To determine the acceleration‚ one needs to measure the velocity at two different points along the incline
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ONE-SCHOOL.NET Average Speed Force and Motion Average Speed = Total Distance Total Time Velocity v= s t Acceleration v = velocity s = displacement t = time (ms-1) (m) (s) a= v−u t a = acceleration v = final velocity u = initial velocity t =time for the velocity change (ms-2) (ms-1) (ms-1) (s) Equation of Linear Motion Linear Motion Motion with constant velocity Motion with constant acceleration Motion with changing acceleration v= s t v = u +
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after which there is no interference apart from gravity. The initial velocity If the projectile is launched with an initial velocity v0‚ then it can be written as \mathbf{v}_0 = v_{0x}\mathbf{i} + v_{0y}\mathbf{j}. The components v0x and v0y can be found if the angle‚ ϴ is known: v_{0x} = vgh_0\cos\theta‚ v_{0y} = v_0\sin\theta. If the projectile’s range‚ launch angle‚ and drop height are known‚ launch velocity can be found by V_0 = \sqrt{{R^2 g} \over {R \sin 2\theta + 2h \cos^2\theta}}
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Introduction to the Language of Kinematics Describing Motion with Words Scalars and Vectors Distance and Displacement Speed Velocity Acceleration Kinematics is the science of describing the motion of objects using words‚ diagrams‚ numbers‚ graphs‚ and equations. The goal of any study of kinematics is to develop sophisticated models which serve in describing (and ultimately‚ explaining) the motion of real-world objects. Much of our lives are spent in motion‚ travelling
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