Work Energy and Power Test

Result

Work Energy and Power Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

_______ is the angle which an inclined plane makes with the horizontal so that a body placed jus begins to slide of its own.

A
Angle of friction

B
Angle of contact

C
Angle of repose

D
Angle of reaction

Solution

The angle of repose is the minimum angle the plane make with the horizontal such that the object placed on the surface begins to slide.
Question 2
1 / -0

A rollercoaster has a vertical loop in its track. When the rollercoaster is moving in the loop with constant speed which of the following is true?

A
Gravity is the only force doing work on the rollercoaster.

B
The rollercoaster is accelerating.

C
The force on the roller coaster is zero.

D
Their net force on the roller coaster is zero.

Solution

When the rollercoaster is moving in a circular track with constant velocity, then due to the circular track the direction of the roller coaster is constantly changing. Since velocity is a vector quantity, any change in its magnitude and direction is a change in velocity and thus the rollercoaster is by definition accelerating