Module 9 Review -- BYOJeopardy

Mechanics	Speed	Velocity	Acceleration	Acceleration Due to Gravity
100 What branch of science deals with analyzing and understanding objects in motion, the forces applied to those objects, and the energy that exists in them? mechanics Mechanics 100	100 What is the equation for calculating speed? speed = distance/time Speed 100	100 Is velocity a scalar or vector quantity? vector Velocity 100	100 Define acceleration. Acceleration is the time rate of change of an object's velocity. Acceleration 100	100 Define free fall. The motion of an object when it is falling solely under the influence of gravity. Acceleration Due to Gravity 100
200 What two factors must you know to study the motion of an object? position and reference point Mechanics 200	200 What is the speed of a boy that runs 100 yards in 6 seconds? 16.7 yards/sec Speed 200	200 How is velocity different from speed? Velocity tells you how quickly an object moves and in what direction. Velocity 200	200 What is the equation used to calculate the acceleration of an object? acceleration = V_final- V_initial time Acceleration 200	200 A very picky physicist states that it is impossible for any object to experience free fall near the earth's surface. Why is the physicist technically correct? In order for an object to be in free fall it can only be influenced by gravity. All objects that fall near the surface of the earth are affected by air resistance which prevents free fall. Acceleration Due to Gravity 200
300 A glass of water sits on a counter. Is it in motion? Explain. The glass of water is moving relative to many reference points. Relative to any object not on earth, the glass of water is in motion. If you walk towards the glass, the glass is in motion relative to you, because the glass's position is changing relative to you. Mechanics 300	300 What is the speed of a boat that travels 10 miles in 30 minutes. Place your answer in miles per hour. 30 min./1 x 1 hr./60 min. = 0.5 hrs speed = 10 mi./0.5 hrs speed = 20 mi/hr Speed 300	300 Every winter I fly 1,535 miles home to Michigan (going East). It takes 5 hours. What is my average velocity? 307 mi/hr east Velocity 300	300 A skater goes from a standstill to a speed of 6.7 m/s in 12 seconds. What is the acceleration of the skater? acceleration = 6.7 m/s - 0 m/s 12 s acceleration = .56 m/s² Acceleration 300	300 A long vertical glass tube contains a feather and a penny. All the air is pumped out, and the tube is inverted, causing the penny and the feather to fall. Which hits the bottom of the tube first? They both hit at the same time since all air resistance has been removed. Acceleration Due to Gravity 300
400 A child is floating in an inner tube on a still lake. His position does not change relative to a tree on the shore. He watches two girls jog along the sahore of the lake. The girls are keeping perfect pace with each other. Relative to whom is the child in motion? The two girls. Mechanics 400	400 What is the speed of a jogger who jogs 6 kilometers in 45 minutes? Answer in meters per second. 6 km/1 x 1000 m/1 km = 6000 m 45 min/1 x 60 sec/1 min = 2700 sec speed = 6000 m/2700 sec = 2.2 m/sec Speed 400	400 Two birds are traveling towards each other. The first is traveling south at a speed of 12 mph and the second is traveling north at a speed of 8 mph. What is their relative velocity? 12 mph + 8 mph = 20 mph towards each other. Velocity 400	400 A good runner can keep up a pace of 0.15 miles per minute for quite some time. If a runner starts from rest and settles into a velocity of 0.15 miles per minute south after 3 seconds of running, what is the runner's acceleration over that 3-second interval? 3 s/1 x 1 min/60 s = 0.05 min. acc = 0.15 mi/min - 0 mi/min = 3 mi/min. 0.05 min. Acceleration 400	400 What is the height of a building in meters if it takes a dropped rock 4.1 seconds to fall from the roof? distance = 1/2 x (acc)(time)² distance = 1/2 x (9.8m/s²)(4.1 s)² distance = 1/2 x (9.8 m/s²)(16.81s²⁾ distance = 1/2 x 164.74 m = 82.4 m Acceleration Due to Gravity 400
500 A child is floating in an inner tube on a still lake. His position does not change relative to a tree on the shore. He watches two girls jog along the shore of the lake. The girls are keeping perfect pace with each other. Relative to whom is the first girl in motion? Relative to whom is the seond girl not in motion? The first girl is in motion relative to the child. The second girl is motionless to the first girl. Mechanics 500	500 The fastest train in the world moves at 500km/hr. How far will it go in 3 hours? distance = speed x time distance = 500 km/hr x 3 hr = 1500 km Speed 500	500 Calculate the velocity for both and tell which has a greater velocity: 1. A man skiing downhill 3158 m in 72 seconds, or 2. A teen riding a motorcycle west, 5000 m in 123 seconds? 1. V = 3158 m down/72 s = 43.86 m/s 2. V = 5000 m west/123 s = 40.65 m/s The man skiing has a greater velocity. Velocity 500	500 A baby sitter pushing a stroller starts from rest and accelerates at a rate of 0.500m/s². What is the velocity of the stroller after it has traveled for 4.75 minutes? 4.75 min/1 x 60 s/1 min = 285 s velocity = acceleration x time 0.500 m/s² x 285 s = 142.5 m/s forward Acceleration 500	500 A hot air ballonist drops a rock from his balloon. It takes 7 seconds for the rock to fall to the ground. What is the ballonist's altitude in feet? distance = 1/2 x (acc)(time)² distance = 1/2 x (32 ft/s²)(7 s)² = 1/2 x (32 ft/s²)(49 s²) = 1/2 x 1568 ft = 784 ft Acceleration Due to Gravity 500
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Mechanics	100
What branch of science deals with analyzing and understanding objects in motion, the forces applied to those objects, and the energy that exists in them?
Answer