PHY-102 Week 1 Assignment. PHY-102: Motion Exercises

PHY-102 Week 1 Assignment. PHY-102: Motion Exercises. Jane is collecting data for a ball rolling down a hill. She measures out a set of different distances and then proceeds to use a stopwatch to find the time it takes the ball to roll each distance. a. What is the independent variable in her experiment? The ball would be the independent variable because it is not dependent on any other variable. b. What is the dependent variable in her experiment? The stopwatch would be the dependent variable because the time in which it stops on will be dependent on the distance in which the ball travels. c. Give one control variable for her experiment. The distances that the ball travels would be the control variable as the experimenter is in control utilizing varying distances to see how long it takes the ball to travel certain distances. 2. Consider an experiment where you drop an object. a. Briefly describe your proposed experiment. (Make sure it is controlled). For this experiment I will drop a pen and use a stopwatch on my phone to determine how long it takes to hit the ground from varying distances to the floor. b. What would be the independent variable for your experiment? The pen would be the independent variable because it is not dependent on any other variable. c. What would be the dependent variable for your experiment? The stopwatch on my phone would be the dependent variable because the time in which it stops on will be dependent on the distance in which the pen falls. d. Give one control variable for your experiment. The distance in which the pen falls will be the control variable as the experimenter is in control utilizing varying distances to see how long it takes the pen to hit the floor. This study source was downloaded by from CourseH on :37:03 GMT -05:00 3. Consider a freely falling object. A free-falling object would uniformly fall due to the force of gravity. The force of gravity has a standard acceleration formula a. What is the acceleration (in m/s2 ) after 5 seconds of fall? 5 Seconds = 9.8 m/s2 b. What is the acceleration (in m/s2 ) after 10 seconds of fall? 10 Seconds = 9.8 m/s2 To determine the velocity of a free-falling object you would use the formula. velocity = acceleration * time c. What is the velocity (in m/s) after 5 seconds of fall? 9.8 m/s * 5 Seconds = 49.0 m/s d. What is the velocity (in m/s) of 10 seconds of fall? 9.8 m/s * 10 Seconds = 98.0 m/s 4. A sign is hung between two cables as illustrated below. If the sign weighs 350 N, what is the tension (in N) in each cable? T= MG/2 = 350/2 = 175N Each cable has a tension of 175N because the sign is hung in between the cables which is evenly distributing its weight to each cable. 5. A construction worker on a high-rise building is on a platform suspended between two cables as illustrated below. The construction worker weighs 850 N, the plank weighs 450 N, and the tension in the left cable is 550 N. a. What is the tension (in N) in the right cable? T = 750N b. Explain your answer.