Laws of Motion-Force and Inertia (NEET Physics): Questions 19 - 21 of 56

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Question number: 19

» Laws of Motion » Force and Inertia

MCQ▾

Question

The roadway bridge over a canal is the form of an arc of a circle of radius 10 m. What is the minimum speed with which a car can cross the bridge without leaving contact with the ground at the highest point (g = 9.8 m/s 2)

Choices

Choice (4) Response

a.

7.556 m/s

b.

5.76 m/s

c.

14.654 m/s

d.

9.899 m/s

Passage

Pseudo force is an imaginary force which is recognized only by a non-inertial observer to explain the physical situation according to newton’s laws. Magnitude of pseudo force F is equal to the product of the mass m of the object and the acceleration a of the frame of reference. The direction of the force is opposite to the direction of acceleration, F =-ma

Question number: 20 (1 of 1 Based on Passage) Show Passage

» Laws of Motion » Force and Inertia

MCQ▾

Question

A spring weighing machine inside a stationary lift reads 50 kg when a man stand on it. What would happen to the scale reading if the lift is moving upward with (i) constant velocity (ii) constant acceleration?

Choices

Choice (4) Response

a.

50 kg wt, (50+50ag)kgwt

b.

50 kg wt, (50ag)kgwt

c.

50 kg wt, (50+50ga)kgwt

d.

50 kg wt, (50ga)kgwt

Question number: 21

» Laws of Motion » Force and Inertia

MCQ▾

Question

Choose the correct options

(1) A reference frame in which Newton’s first law is valid is’ called an inertial reference frame.

(2) Frame moving at constant velocity relative to a known inertial frame is also an inertial frame.

(3) Ideally, no inertial frame exists in the universe for practical purpose, a frame of reference may be considered as inertial if its acceleration is negligible with respect to the acceleration of the object to be observed.

(4) To measure the acceleration of a falling apple, earth cannot be considered as an inertial frame.

Select the correct answers and mark it according to the following

Choices

Choice (4) Response

a.

1 and 3 are correct

b.

1 and 2 are correct

c.

1, 2 and 3 are correct

d.

2 and 4 are correct

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