Study Guide Answer Key 1.Instantaneous speed – speed at any given time (cop radar) Constant speed – speed stays the same the entire time (car on cruise.

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Study Guide Answer Key 1.Instantaneous speed – speed at any given time (cop radar) Constant speed – speed stays the same the entire time (car on cruise control) average speed – total distance traveled in a given time (the average speed you went on a car trip) 2.Distance relates to gravity because the farther objects are apart, the less gravity. Mass relates to gravity because the more mass objects have, the stronger the gravitational pull

3. Mass – how much matter or particles are in an object Volume – how much space an object or substance takes up Weight – force of gravity on an object 4.Contact: Applied, Normal, Friction, Tension, Spring Non-Contact: Gravitational, Magnetic, Electrical 5. Every particle and object in Universe has gravity and amount gravity depends on mass and distance.

6.Electrical force (static electricity – charges mix together) 7.Speed, direction or both Speeding up, slowing down or changing direction 9.distance/time = 44 km/11 s = 4 km/s 10. speed is 48 km/h time is 3.5 h distance =? d = st = 48 x 3.5 = 168 km

11. S = d/td=stt=d/s 12. a = v f – v i t 13. speed = how much distance traveled in an amount of time velocity = the same plus in a given direction 14. at rest – speed is constant at zero

15.Independent = always time (on x-axis) dependent = always distance (on y-axis) 16.Straight line represents constant speed (only on a speed graph) 17. SI unit for speed is m/s. Acceleration is m/s Air resistance slows it down or pushes in all directions, including up, gravity pulls it down

19.The same time if they are the same size. 20. The amount of inertia depends on the amount of mass and object has. 21. The amount of gravity depends on mass and distance. 22. Your weight will decrease as you go higher, because you are increasing your distance from Earth.

23.For every action, there is an equal and opposite reaction. 24. friction is always in opposite direction of motion 25. A force is always described by its: strength and direction 26. a) 2 nd Lawb) Universal Gravitation c) 3 rd Lawd) 1 st Law

27. B (FCAT Question) 28.independent variable (what you change on purpose) = amount of food dependent (outcome/measure) = weight control (keep normal to compare) = normal amount of food constant (keep same) = type of tank, type of fish, type of food, etc. 29. Net Force = 80 N Piano 30 N 50 N