1. The diagram shows the positions at intervals of 0.10 seconds of a ball moving
ID: 2126292 • Letter: 1
Question
1. The diagram shows the positions at intervals of 0.10 seconds of a ball moving from left to right (as in a photograph taken with a stroboscope that flashes every tenth of a second).
2. Two identical pieces of paper, one crumpled into a ball and the other left uncrumpled, are released simultaneously from inside the top of a large evacuated tube. Which one, if either, do you expect will reach the bottom of the tube first?
3. If an object is in free fall, what forces are acting on it? (See the everyday phenomenon box. Select all that apply.
gravitational forceelectrostatic forceforce of air resistance
4. A steel ball is dropped from a diving platform (with an initial velocity of zero). Use the approximate value of g = 10 m/s2.
(a) Through what distance does the ball fall in the first 1.3 seconds of its flight?
m
(b) How far does it fall in the first 3 seconds of its flight?
m
5. A ball is thrown upward with an initial velocity of 14 m/s. Using the approximate value ofg = 10 m/s2, how high above the ground is the ball at the following times?
(a) 1.00 s after it is thrown
m
(b) 2.00 s after it is thrown
m
Explanation / Answer
1. No. the ball is moving at constant velocity. Because its traveling the same distance in same time intervals. so acceleration =0.
2.Both will reach at same time. Because both has same acceleration.(i.e. gravitational g). so both wil take same time to travel same distance as innitial velocity is zero for both.
3. force of gravitation and air resistance force
4.a) 8.45m. as after 1.3 sec v=13m/s. v^2-u^2 = 2as => s=8.45m
b)45 m
5.a)9m. using the same formulae as question 4
b)8m. as the ball will be at zero velocity at highest point =9.8m and after that it will travel for .6sec
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