Physics assignment - Essay Example

Physics Assignment> and Section # of The assignment is all about motion, speed, acceleration and forces. It also has parts about energy in waves; longitudinal and transverse. QUESTION # 1Question # 1 (a) The car travels at a constant speed of 10 m/s from t0 – t1. In the interval t1 – t2, the car accelerates uniformly with 5 m/s2 acceleration, up to the speed of 15 m/s. In time interval t2 – t3, the car decelerates constantly with the rate of 15m/s2, until it comes to a halt. Now the car changes direction, in the time interval of t3 – t4, and is accelerating in the opposite direction to the previous one, with the rate of 15 m /s2 up to a velocity of 15 m /s in the opposite direction.

Question # 1 (b) i Total distance = area under the graphArea t1 = 10 x 1= 10 m Area t2 = (10 x 1) + (0.5 x 1 x 5) = 12.5 m Area t3 = (0.5 x 1 x 15) = 7.5 mArea t4 = (0.5 x 1 x 15) = 7.5 m Total area = Area of (t1 + t2 + t3 +t4) = 10 + 12.5 + 7.5 +7.5 = 37.5 m Question # 1 (b) ii Displacement = motion in forward direction – motion in opposite direction = area of (t1 + t2 + t3) – area of t4= (10 + 12.5 + 7.5) – 7.5= 22.5 meters from the starting pointQuestion # 1 (c) Wok done = Force x displacementForce = mass x accelerationWork done t0 – t1 = 0, since there is no acceleration Work done t1 – t2 = (1000 x 5) x 12.

5 = 62.5 kJoulesWork done t2 – t3 = (1000 x 15) x 7.5 = 112.5 kJWork done t3 – t4 = (1000 x 15) x 7.5 = 112.5 kJTotal work done = 287.5 kJQuestion # 1 (c) QUESTION # 2Question # 2 (a)Question # 2 (b)Question # 2 (c) The curving of the ball depends upon the point of impact on the ball relative to its axis. The air opposing the spinning ball causes different air friction at different sides of the ball depending upon the direction of rotation. Due to differing air action on two sides the ball curves towards one side, if a ball is rotating anti-clockwise, the air on its right side causes more impedance because of the ball surface moving against the wind, than on its left side.

This is moving in the direction of the wind hence causing the ball to curve towards left.QUESTION # 3BALL A:Ball A will travel longer in the air. It happens because the smoothness of the ball causes the air to curve around its surface without creating a lot of resistance during its motion, thus the air drag is low, where as ball B will travel shorter in the air. This is due to the rough surface of the ball that will act as small pockets to the air that is curving around the ball, hence causing air friction on it.

This will reduce the energy of ball B greatly. The ball B hence, will travel a shorter distance compared to the Ball A. QUESTION # 4Question # 4 (a) iThe P waves are the longitudinal waves whereas the S waves are transverse waves.Question # 4 (a) iiThe S waves travel perpendicular to the direction of the vibration, where as the P waves travel in a direction parallel to the oscillations of the particles. The P waves travel with twice the speed of S waves. The P waves travel in forms of compression and rarefaction zones whereas the S waves travel in form of ripples.

The P waves starts forming much earlier than the S waves.Question # 4 (b) iThe answer is 2.4 km as seen on the graph.Question # 4 (b) ii The P waves (longitudinal)BIBLIOGRAPHYBanana kick video from, retrieved date: 08-04-2011 http://www.youtube.com/watch?v=yofcwPYI8LQChew, C. (1995) physics a course for O levels, second edition. Singapore. Federal Publications.Sengor, A. (2005) Internal geodynamics. İTÜ. Avrasya Yerbilimleri Enstitüsü. Wesson, J. (2002). The Science of Soccer. Bristol. UK, IOP.