PHYSICS Friction Practice Sheet 1 1) A sled with a mass of 10 kq is launched at a speed of 12 m/s over smooth frictionless ice. After traveling 5 m, the sled encounters rough ice that exerts a frictional force on it. The sled travels for 12 m before coming to a stop. a. What is the acceleration of the sled on the smooth ice? omls b. What is the initial velocity of the sled when it reaches the rough ice? 12M/> c. What is the acceleration of the sled on the rough ice? Cm/S d. What is the net force acting on the sled as it travels across the rough ice? - 6 0N e. What is the force of friction between the sled and the rough ice?-Gon f. What is the coefficient of friction between the sled and the rough ice?0.6 12 2) Using all of the information in problem (1), calculate the initial speed of the sled so that it will travel 19 m across the rough ice. 15.1. 3) Snowball II is riding on the back of Santa's Little Helper who is running at a speed of 125 m/s. Snowball Il leaps off of SLH and lands on the ground. She skids to a stop is 17 seconds a. What is Snowball II's initial velocity when she begins to skid to a stop? /25M/s b. What is Snowball II's acceleration while she skids to a stop?-7, 35 m/s c. If S. II's mass is the same as SLH's mass, 725 kg, what is the net force acting on Snowball II?-532 6, d. What is the coefficient of friction between Snowball II and the ground?0,75 e. How far does Snowball II travel while she is skidding to a stop? 1062,Im 4) A ball with a mass of 3 kg is fired horizontally from a gun at an unknown speed from a table that is 1.4 m high. The ball lands on the ground 2.7 m from the table. a. What is the velocity of the ball when it is launched? (HINT: Use vertical and horizontal equations of motion.) A piece of sand paper is now placed at the edge of the table so that when the ball rolls across the sand paper, it will slow down due to friction. The launcher is placed so that there is 1.25 m of sand paper between the ball and the edge of the table. After the ball is fired, it rolls across the sand paper (and slows down) and then flies off the table. The ball lands on the ground 1.9 m from the edge of the table b. What is the speed of the ball when it is launched from the launcher? (Does it change?) c. When the ball reaches the edge of the table, will it be going faster or slower than when it was launched? d. What is the horizontal constant speed of the ball when it is flying through the air? e. What is the final velocity of the ball when it reaches the end of the table? f. What is the acceleration of the ball while it is rolling across the sand paper? (HINT: vi?, vp=?, d=?, solve for a) g. What is the force of friction acting on the ball as it travels across the sand paper? h. What is the coefficient of friction between the ball and the sand paper? 5) What length of sand paper is needed so that the ball in problem (4) will land on the ground at a distance of 1.1 m from the table? 1) 0 m/s 2 12 m/s -6 m/s2 -60 N -60N 0.612 2) 15.1 m/s -5328. 75 N 0.75 3) 125 m/s -7.35 m/s2 :5437.5-N 0-77 1062.9 m 4) 5.1 m/s 5.1 m/s slower 3.6 m/s 3.6 m/s -5.2 m/s2 -15.6 N 0.53 5) 2.06 m