# Laws of Motion-Force and Inertia (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 19 - 21 of 57

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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,

b.

50 kg wt,

c.

50 kg wt,

d.

50 kg wt,

## 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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