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Therefore, fixture = distance of the taping chosen Time interval for that aloofness You are provided with a runway and a data-logging system with a motion sensor. constitute how you should use the apparatus to conduct an test to demonstrate the relationship amid the fire ram and the acceleration of a tramcar. You may use additional apparatus if obligatory (5M) Adjust the runway for attrition wages (1 M) Pull a streetcar brush up the runway using an elastic thread. remain the extension of the elastic thread aeonian 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 very(a) elastic threads, boldness by side and extended by the similar length as before. (1 M) From the experiment, it is found that the acceleration of the trolley is directly proportional to and in the same direction of the net force. (1 M) It is not favored to carry an excessive amount o f goods on the bicycle when he is riding in the street, why? (3M) The larger the mass, the larger the inaction the bicycle has. 1 M) By newtons number right of motion, the deceleration of the bicycle would construct smaller when John applies the brake. (1 M) As a result, the stopping distance ncreases (1 M) So the misfortune of having an accident is larger. In supermarkets, bottled drinks are normally stored in refrigerators with shelves devoted at an wobble B with the horizontal.Explain why there is much(prenominal) an arrangement. Also state the minimum incline call for to achieve the pur stick above. minded(p) mass of a bottle M, friction amid a I-kg bottled drink and the be 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 well-to-do for customers. (1 M) MgsinB > f (f/M9 (1M) Therefore, the least inclination list is sinA-1 ( f/Mg). In some move of the world, it is common for people to shoot firearms straightforward up into the convey during celebrations. Falling licks pose a signifi slewt danger to bystanders. As a bullet falls, its swiftness increases until it reaches a constant magnetic pole velocity. Explain, in call of forces acting on the bullet, why this happens.Also, give birth the air justification is bv , derive the terminal kinetic vital force of the bullet. (5M) As the bullet falls, its downward exercising weight and the upward air under instal (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 delay 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 player Jumps up such that his height reach es a height of 3m. utilise Newtons laws of motion, explain why the player potful gain an initial speed to put across the ground vertically. (3M) The player exerts a force onto the ground when he is about to ump. (1 M)This results an extend to normal reaction force from the ground harmonize 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 2nd law of motion. 1 M) Chapter 8 What is the advantage ot using the spanner3z to bring a screw* effort(force) required faecal matter be reduced. (2) The qualification can be increased. X (3) The energy required can be reduced. X For (2) and (3), they are aggrieve as moment is not relate to energy. (Force is perpendicular to the displacement, the work done should be zero. ) Chapter 9 There are both systems of raising the barricade from the ground to a certain height. (2M) Method 1 pull the block up a inclined plane Method 2 Lif ting the block vertically upwards.Method 1 is better than method 2 in terms of forces as smaller force is needed to pitch the block in method 1. (1 M) However, method 1 has a lower 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 ascension system? (3M) To reduce the power required to raise the car (1 M) To reduce the adulterate acting on the motor (1 M) To ameliorate the efficiency of the lift (As less energy is lost to overcome the friction between the cable line and the drum) (1 M) Verify the preservation of mechanical energy.Given a simple pendulum, a protractor, a unmortgaged gate, a ruler. (7M) develop up a simple pendulum, a protractor and a light gate. (1 M) Displace the dockage and read the angle B between the string and the vertical from the protractor. (1 M) Start data-logging and put under the bob. (1 M) Record the time t taken for the bob to pass through the l ight gate. Measure the diameter of the bob(this is the distance traveled by the bob while enactment the light ate, which is very small so the instantaneous speed of the bob in the last position reason is relatively accurate), and hence estimate the speed v of the bob at the lowest position. 1 M) Use a ruler to valuate 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 values of speed calculated is quite close so the law of conservation of energy is proved.