5-Item MCQ s in Kinematics

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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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5-Item MCQ s in Kinematics

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5-Item MCQs 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

c. Speed

d. Velocity

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.

Correct!

Congratulations.

View explanation #1.

Correct!

Congratulations.

View explanation # 2.

Correct!

Congratulations.

View explanation # 3.

Correct!

Congratulations.

View explanation # 4.

Correct!

Congratulations.

View explanation # 5.

Wrong!

You may try again.

Explanation # 1:

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

Explanation # 2:

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.

Explanation # 3:

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

Explanation # 4:

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

Explanation # 5:

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

Thank you!

This is the end of this test.

Prepared by:

RONALD P. DIANA

Ramon Magsaysay (Cubao) HS – Philippines

• Under the supervision of:

Prof. PHILIP WONG

Nat’l. Inst. Of Education (NIE) – Singapore