ES 105 Homework Assignment 1 Name Do these problems on these sheets Use the backs of the sheets if needed Be sure to clearly label the problems by number if you use the back Show the equations you used to solve these problems Be sure to include units for full credit This homework is due January 12 or January 13 at the beginning of your class Worth 15 points Late assignments will not receive full credit 1 Find the net force produced by a 30 N force and a 20 N force if both forces are acting in the same direction 2 Find the net force produced by a 30 N force and a 20 N force if the forces are acting in opposite directions 3 Calculate the average speed of a tennis ball that travels the full length of a tennis court 24 meters in 0 5 seconds 4 If you were riding a bicycle along a straight road at 7 5 meters how second far would you go in 5 0 minutes 5 When a bicycle rider starts from a standing stop and is traveling 2 meters after 1 second what is the acceleration of the bicycle second 6 What is the acceleration of a ball rolling down a ramp if the ball gains 25 7 meters of speed in 5 seconds second Suppose you push a 2 kg can of coffee along a horizontal surface with a horizontal force of 20 N If there is a frictional force of 12 N acting on the coffee can what is the net force on the coffee can What is its acceleration 8 If you exert a force of 10 0 N on a 6 67 kg shopping cart for 3 0 seconds what is its acceleration Circle the information given above that do you not need to solve this problem 9 A 5 kg bag of groceries is tossed onto a table at 4 meters and slides to second a stop in 3 seconds What is the force of friction between the table and the grocery bag 10 When an 80 kg firefighter slides down the fire pole and accelerates m 4 2 what frictional force acts between the firefighter and the pole s In what direction does it act 11 When a test car crashes into a wall at 25 meters and stops in 0 1 second seconds what is the force exerted on a 75 kg test dummy by the seat belt 12 If you push the end of a lever 1 2 meters with a force of 50 N and the load at the other end of the lever moves 0 2 meters what is the weight of the load in N 13 A pulley system is employed to lift a 5 000 N piano What force is required to lift the piano if the piano rises 0 2 meters for every 2 meters of rope pulled 14 When a ball is thrown straight up with an initial velocity of 30 meters second how long will it go up How far will it go up 15 A cart is pushed and undergoes a certain acceleration How the acceleration would compare if it were pushed with twice the net force while its mass increased by four Vocabulary write the definition of the terms listed Acceleration Energy Force Gravity Momentum Newton unit not person Projectile Velocity
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