Dublin Unified School District



Chapter 9 Study GuideWhen an object's distance from another object is changing, it is in ____________________________When you know both the speed and direction of an object's motion, you know the __________ of the object.If you know the distance an object has traveled in a certain amount of time, you can determine the _________ of the object.If the speed of the object does NOT change, the object is traveling at a ____________________speed.If a bicyclist travels 30 km in two hours, what is her average speed? ______________If an object moves in the same direction and at a constant speed for 4 hours, the object's _______________ did not change.A car travels 85 km in the first hour of a trip. The car continues to travel for 2 more hours and travels 200km. What was the average speed of the car for the trip? ______________The rate at which velocity changes is called _______________Changing direction is an example of a kind of ______________________The moon accelerates, explain why this is a true statement.To determine the acceleration rate of an object, you must calculate the change in speed during each unit of___________________. If speed is measured in kilometers per hour and time is measured in hours, the unit of acceleration is _______________What is the formula for acceleration?In a graph showing speed versus time, a straight line shows the acceleration is _______________.What kind of line on a distance-versus-time graph indicates that the object is accelerating? ________In a graph of distance versus time, the slope represents _____________________________The rise of a line on a distance-versus-time graph is 400 km and the run is 50 hours, the speedrepresented by this graph is ________________Unlike kinetic energy, potential energy is __________________Potential energy that depends on height is called _____________________________________ If a toy car traveling at 10 cm/s passes a toy car moving at 10 cm/s in the opposite direction, both cars have the same ________________________A child riding on a merry-go-round is accelerating because his direction is ________________The SI unit of __________________________________is the meter per second per second.The energy of a book sitting on a shelf is an example of _____________________________. A compressed spring has _______________________________energy.A helicopter flies 100km to the north and then flies 50km to the east. The information about the helicopter is an example of velocity or speed. (circle the work that fits best in the sentence)You are riding a bicycle past a building, the reference point is the _____________________________ Suppose you are sitting in a car at a red light when another car begins to pass you, the reference point is the _____________________________Speed that does not change is referred to as ___________________________________speed.The statement that the hurricane is 20 kilometers per hour in an easterly direction is a description of the hurricane's______________________.A speed of 15 kilometers per hour is abbreviated as 15 _____________The abbreviation of the unit of acceleration (meters per second per second) is ___________If a train traveling at 30 m/s brakes to a stop in 1 minute, the magnitude of its acceleration is ______If two lines appear on the same motion graph, the line with the steeper slope indicates a greater ______________A large truck and a small car are moving at the same speed. The truck has greater kinetic energy because it has a greater __________________. A baseball flying through the air has _______________________energy because of it is in motion.The law of _____________________________________states that energy cannot be ________________ or _________________A quantity that consists of both a magnitude and a direction is called a _______________________Potential and Kinetic Energy Illustration: You will have a picture similar to the Figure 13 on page. Create your own diagram that shows which positions have greater or smaller potential energy and kinetic energy. 20283716673300 31048781914100Speed (displacement) Graph: ?label all of the segments on the graph with what is occurring during that segment. (ie: ?speed increasing, standing still, etc.) ?Graph of acceleration: label all of the segments on the graph with what is occurring during that segment. (ie. accelerating, decelerating, etc.)Acceleration Practice Problems: ?all answers should be in m/s/s. ?round to the nearest hundredtha.) ?If Neha goes from 8m/s ?to 1 m/s south in 3 sec. ?What is her deceleration?b.) ?Michael ran 0 km/s to 10 km/hr in ?2 min up a hill. ?What is his acceleration?c.) ?Mikaela runs 2 km/hr to 5 km/hr heading southwest. ?It took her 3 minutes. ?What is her acceleration? ................
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