ASSESSMENT TEST A (I) Introductory Physics Assignment 1 – V7 CQUniversity Australia 4 3. Describe random and systematics errors (include if/how they can be reduced or corrected). (3) 4. Describe...

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ASSESSMENT TEST A (I) Introductory Physics Assignment 1 – V7 CQUniversity Australia 4 3. Describe random and systematics errors (include if/how they can be reduced or corrected). (3) 4. Describe accuracy and precision. (2) Introductory Physics Assignment 1 – V7 CQUniversity Australia 5 5. Perform the following calculation ( ) ( )97.2 0.4 28.23 2%cm cm . Display the answer with the correct number of significant figures and error. (4) Introductory Physics Assignment 1 – V7 CQUniversity Australia 8 2. A car, initially moving at 20?? hr 1, accelerates over a time of 220s to reach a velocity of 100?? hr 1. a) Write down all the knowns and unknowns and convert to base SI units. Include a frame of reference (1.5) b) What was the acceleration in 2ms ? (1.5) c) If the car continues to accelerate at the same rate, how far will it have driven when it reaches 110?? hr 1 (from the initial velocity of 20?? hr 1)? (3) Introductory Physics Assignment 1 – V7 CQUniversity Australia 11 4. A mass is thrown vertically, 9 m straight up. With what velocity must it be thrown and how long does it take for the mass to return to its starting position, ignoring air resistance? Use gravity laws and include a diagram, sign convention and list of knowns/unknowns. (4) Introductory Physics Assignment 1 – V7 CQUniversity Australia 12 FORC- Forces 24 marks 1. A particular brake design can apply a force of 2600 N. If you wish to have a deceleration of 28 m s , what is the largest car weight you can use with this design? (Include sign conventions and list knowns/unknowns) (2.5) Introductory Physics Assignment 1 – V7 CQUniversity Australia 13 2. A 180 kg refrigerator requires 800 N to just move it across the floor. (a) Draw a labelled diagram including all forces, with a sign convention and list all knowns etc (1) (b) Determine the coefficient of static friction (2) (c) If the coefficient of kinetic friction is 0.2, determine the force required to continue pushing it at constant velocity. (1.5) Introductory Physics Assignment 1 – V7 CQUniversity Australia 14 3. Two sleds attached by a string (of negligible mass) are being pulled across an icy surface (where friction is negligible) with a horizontal force of 150 N. If the mass of the first sled is 4.5 kg and the mass of the second is 3.8 kg. (a) Draw a labelled diagram, with a sign convention and list all knowns etc (1) (b) Determine the normal forces acting on each sled (2) (c) Find the tension in the string & the acceleration of the sleds (3) Introductory Physics Assignment 1 – V7 CQUniversity Australia 15 4. A 15 kg mass sitting on a horizontal bench, just starts to slide when a 10.0 kg mass hangs from a pulley (connected at 90°). Find (a) Draw a labelled diagram, with a sign convention and list all knowns etc (1) (b) the co-efficient of static friction for the horizontal surface (2) (c) the acceleration of the 17 kg mass sideways if the co-efficient of kinetic friction is 0.4 (3) Introductory Physics Assignment 1 – V7 CQUniversity Australia 17 5. A seesaw is 2.4 m each side. A child of 38 kg sits on the edge. An adult is sitting at a particular point, balancing the seesaw. (a) Draw a labelled diagram and list knowns/unknows etc. (1) (b) What class of lever is this? (0.5) (c) Where does an adult of 92 kg need to sit in order to balance the plank? (1.5) 6. Describe Class II and III levers (including the differences) (2)