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Therefore, speed = length of the show chosen Time interval for that length You are provided facetiousnessh a cartroad and a data-logging organization with a motion sensor. Describe how you should use the tool to conduct an experiment to demonstrate the relationship in the midst of the net wad and the acceleration of a tram. You may use additional apparatus if requisite (5M) Adjust the runway for friction compensation (1 M) Pull a trolley down the runway using an lively thread. Keep the extension of the elastic thread constant all the way.M) Record the motion ot the trolley wit data-logging system and find the acceleration of the trolley. (1 M) Repeat by pulling he trolley with 2, 3 and 4 identical elastic threads, side by side and extended by the same length as before. (1 M) From the experiment, it is embed that the acceleration of the trolley is directly proportional to and in the same fashion of the net force. (1 M) It is not preferable to carry an excessive amount of go ods on the bicycle when he is riding in the street, why? (3M) The large the mass, the larger the inertia the bicycle has. 1 M) By newtons second justness of motion, the retardent of the bicycle would become smaller when John applies the brake. (1 M) As a result, the filet distance ncreases (1 M) So the chance of having an accident is larger. In supermarkets, bottled drinks are usually stored in refrigerators with shelves inc confinesd at an angle B with the horizontal.Explain why at that place is such an arrangement. Also state the minimum angle required to extend to the purpose above. Given mass of a bottle M, friction amid a I-kg bottled drink and the inclined shelf is f. 3M) If the bottled drinks are put on inclined shelves, they would slide down automatically when the first bottle is taken. It is more convenient for customers. (1 M) MgsinB f (f/M9 (1M) Therefore, the least inclination angle is sinA-1 ( f/Mg). In some parts of the world, it is common for people to shoot firearms straight up into the air during celebrations. Falling slugs pose a signifi baset danger to bystanders. As a weed falls, its f number increases until it reaches a constant terminal velocity. Explain, in terms of forces acting on the bullet, why this happens.Also, assume the air immunity is bv , derive the terminal kinetic energy of the bullet. (5M) As the bullet falls, its downward(prenominal) weight and the upward air resistance (or friction) are acting on it (1 M) Firstly the bullet accelerates. The air resistance opposing the motion of the bullet increases with its velocity. (1 M) Finally, its weight is balanced by the air resistance at a certain velocity. (1 M) As the net force acting on the bullet is zero, the bullet will continue to fall at this constant velocity which is called terminal velocity. mg = bv) (1M) KE=O. 5mv?2 = 0. 5mA3 g,N2 /bA2 (1M) A basketball impostor Jumps up such that his height reaches a height of 3m. Using Newtons laws of motion, explain wh y the player can gain an initial speed to leave the primer coat vertically. (3M) The player exerts a force onto the ground when he is about to ump. (1 M)This results an friction match normal reaction force from the ground according to Newtons 3rd law of motion. (1 M) As the normal reaction force is greater than the weight , the player will be forced to accelerate up according to Newtons second law of motion. 1 M) Chapter 8 What is the advantage ot using the spanner3z to acidify a screw* effort(force) required can be reduced. (2) The efficiency can be increased. X (3) The energy required can be reduced. X For (2) and (3), they are wrong as moment is not related to energy. (Force is upright to the displacement, the work done should be zero. ) Chapter 9 There are deuce methods of raising the block from the ground to a certain height. (2M) method acting 1 Pulling the block up a inclined plane Method 2 Lifting the block vertically upwards.Method 1 is better than method 2 in terms o f forces as smaller force is needed to dress up the block in method 1. (1 M) However, method 1 has a depress efficiency because some energy is lost in overcoming the friction between the block and the plane. (1 M) What are the functions of the counterweight in a lift system? (3M) To reduce the power required to raise the car (1 M) To reduce the charge up acting on the motor (1 M) To improve the efficiency of the lift (As little energy is lost to overcome the friction between the cable line and the drum) (1 M) Verify the saving of mechanical energy.Given a simple pendulum, a protractor, a light gate, a ruler. (7M) Set up a simple pendulum, a protractor and a light gate. (1 M) Displace the give chase and read the angle B between the string and the vertical from the protractor. (1 M) Start data-logging and release the bob. (1 M) Record the duration t taken for the bob to pass through the light gate. neb the diameter of the bob(this is the distance travelled by the bob while hi ghly the light ate, which is very small so the instantaneous speed of the bob in the lowest position calculated is relatively accurate), and hence estimation the speed v of the bob at the lowest position. 1 M) drill a ruler to measure the length I of the pendulum. Apply the saving of mechanical energy and calculate the speed v of the bob at the lowest position. (1 M) V = square root (2gh) , where h = I(1-cosB) (1 M) Conclusion, the two value of speed calculated is quite close so the law of conservation of energy is proved.