REVIEW QUESTIONS
COPERNICUS AND THE MOVING EARTH
3. Contrast the relationship between the earth and sun as seen by Aristotle and by Copernicus?
Answer: According to Copernicus and Aristotle from their astronomical observations that the earth travelled around the sun.
A= 10 km/h/s
Answer: According to Copernicus and Aristotle from their astronomical observations that the earth travelled around the sun.
GALILEO AND THE LEANING TOWER
4. What did Galileo discover in his legendary experiment on the leaning tower?
Answer: Galileo discovered that a stone twice as heavy as another did not fall twice as fast, except for the small effect of air resistance, he found that objects of various weights, when released at the same time, feel together and hit the ground at the same time.
Answer: Galileo discovered that a stone twice as heavy as another did not fall twice as fast, except for the small effect of air resistance, he found that objects of various weights, when released at the same time, feel together and hit the ground at the same time.
GALILEO's INCLINED PLANES
6. What does it mean to say an object has inertia?Give example.
Answer:A property of a moving object to continue moving,it means it has inertia.
Answer:A property of a moving object to continue moving,it means it has inertia.
SPEED
10. What is the average speed of a horse that gallops a distance of 15 km in a time of 3o min.?
Answer: s=d/t
s=15/3o
s=o.5
Answer: s=d/t
s=15/3o
s=o.5
VELOCITY
10 s12. Distinguish between speed and velocity?
Answer: Speed is a combination of distance and time while velocity describes speed and the direction of motion.
Answer: Speed is a combination of distance and time while velocity describes speed and the direction of motion.
ACCELERATION
15. Distinguish between velocity and acceleration?
Answer: When we say velocity there is speed and the direction of motion while acceleration we can change velocity of something by changing its speed by changing its direction or by changing both its speed and its direction or the rate of change in velocity.
16. What is the acceleration of a car that increases its velocity from 0-100 km/h in 10 s?
Answer: A=100 km/h
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Answer: When we say velocity there is speed and the direction of motion while acceleration we can change velocity of something by changing its speed by changing its direction or by changing both its speed and its direction or the rate of change in velocity.
16. What is the acceleration of a car that increases its velocity from 0-100 km/h in 10 s?
Answer: A=100 km/h
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HOW FAR
27. What is a distance fallen for a freely falling object 5 s after being dropped from a rest position?What is its 6 s after?
Answer: v=gt g=(10 m/s) (6 s) v=gt
v= 50(5) g= 60 m/s2 v= (60 m/s2) (6 s)
v= 250 m/s v= 360 m/s
EXERCISES
Answer: v=gt g=(10 m/s) (6 s) v=gt
v= 50(5) g= 60 m/s2 v= (60 m/s2) (6 s)
v= 250 m/s v= 360 m/s
EXERCISES
4. One airplane travels due north at 300 km/h while another travels due south at 300 km/h? Are their speeds the same? Are their velocities the same? Explain.
Answer: Yes, they have the same speed but they have opposite velocities.
Because it moves it in an opposite direction.
8. If you were standing in an enclosed car moving at constant velocity, would you have to lean in some special way to compensate for the cars motion? What if the car where moving with a unchanging acceleration? Explain.
Answer:No, Because the car was moving with unchanging acceleration you can't easily stop the car because of its speed.
Answer: Yes, they have the same speed but they have opposite velocities.
Because it moves it in an opposite direction.
8. If you were standing in an enclosed car moving at constant velocity, would you have to lean in some special way to compensate for the cars motion? What if the car where moving with a unchanging acceleration? Explain.
Answer:No, Because the car was moving with unchanging acceleration you can't easily stop the car because of its speed.
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