Enter your Name:   Enter your E-mail Address:  There are 60 seconds in a minute and 3600 seconds in an hour. 01. Define the following terms: a. Reference point b. Vector quantity c. Scalar quantity d. Acceleration e. Free fall 02. Why must one use a reference point to determine whether or not an object is in motion? 03. After a visit to your grandmother's house, you get in your car to go home. You are in the front passenger's seat and your mother is driving. As you back out of your grandmother's driveway, she stands outside, waving good-bye. a. Who is in motion relative to you? b. Who is motionless relative to you? 04. How many miles per hour does a car travel if it makes a 40 mile trip in 30 minutes? 05. What is the velocity of a bicycle (in meters per second) if it travels 1 kilometer west in 4.1 minutes? 06. You are looking in a scientist's lab notebook and find the following unlabeled measurements. In each case, determine what physical quantity the scientist was measuring. a. 12.1 meters per second. b. 31.2 feet. c. 14 millimeters per hour to the left. d. 4.5 yards per minute2 north. 07. An eagle swoops down to catch a baby rabbit. Luckily for the rabbit, he sees the eagle and runs. An all-out race ensues with the rabbit running east at 5.4 meters per second and the eagle pursuing at 4.4 meters per second. What is the relative velocity of predator and prey? 08. What is the acceleration of an object that moves with a constant velocity? 09. A skier reaches the bottom of a slope with a velocity of 12 meters per second north. If the skier comes to a complete stop in 3 seconds, what was her acceleration? 10. A car goes from 0 to 60 miles per hour north in 5 seconds. What is the car's acceleration? 11. A person standing on a bridge over a river holds a rock and a ball in each hand. He throws the ball down towards the river as hard as he can and at the same time simply drops the rock. After both have left the person's hand, does one have a greater acceleration? If so, which one? 12. Why does a dropped feather hit the ground later than a rock dropped at the same time? 13. A physics student climbs a tree. To measure how high she has climbed, she drops a rock and times its fall. It takes 1.3 seconds for the rock to hit the ground. How many feet has she climbed?