5-Item MCQ s in Kinematics. 1) What do you call the total length traveled by an object in a given time?. a. Distance. b . Displacement. c . Speed. d . Acceleration. 2) The slowing down of an object’s motion is more appropriately called _______. a. Deceleration. b . Displacement.
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1) What do you call the total length traveled by an object in a given time?
2) The slowing down of an object’s motion is more appropriately called _______.
3) A bus moves along PIE at a constant speed of 60 kph in 2 hours. What is its acceleration?
a. 0 ms-2
b. 10 ms-2
c. 60 ms-2
d. 120 ms-2
4) A car moves at a uniform speed of 20 ms-1 in 1.5 minutes. How far did it go during that period?
a. 0.6 km
b. 1.8 km
c. 3.0 km
d. 4.1 km
5) A train comes to a stop in 45 seconds from a speed of 400 m/s. Calculate its deceleration.
a. About 9 ms-2
b. About 12 ms-2
c. About 15 ms-2
d. About 19.6 ms-2
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View explanation # 5.
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Total length is the total distance d traveled by an object. Given time is the time elapsed t to travel a certain distance. If you divide distance by time, you get speed v. In symbols,
v = d/t
In the physical world, the slowing down or coming to a stop of an object is called negative acceleration or, more appropriately, deceleration. It happens when the final velocity of an object is less than its initial velocity.
An object that moves with a constant speed has zero acceleration. You can prove this mathematically by using the equation:
You can clearly infer from the equation that if vi and vf are the same, the acceleration becomes zero, no matter how long the object travels.
a = (vf-vi)/t
Time must be expressed in seconds. By converting, 1.5 minutes is equal 90 seconds. Since v = d/t , and substituting the values:
v = d/t
20 ms-1 = d / (90s)
d = (20 ms-1) (90s)
d = 1800 m = 1.8 km
In the physical world, deceleration means slowing down of an object’s motion. In the problem, vi = 400m/s, vf = 0, and t = 45 s. Since a = (vf-vi)/t , and substituting the values:
a = (vf-vi)/t
a = (0 m/s – 400 m/s) / 45 s
a = 8.88 m/s2
This is the end of this test.
RONALD P. DIANA
Ramon Magsaysay (Cubao) HS – Philippines
Prof. PHILIP WONG
Nat’l. Inst. Of Education (NIE) – Singapore