Translational and Rotational Motion

Q.

The adjacent diagram (Fig. 1.27) shows a heavy roller, with its axle at O, which is to be raised on a pavement XY by applying a minimum possible force. If there is friction between the roller and pavement, show by an arrow on the diagram the point of application and the direction of force to be applied.

Q. A rigid rod is placed against the wall as shown in the figure when the velocity of lower end is 10m/s. And its base makes an angle 60 degree with the horizontal then the velocity of its end B will be?

Q.

What is a couple?

1. to multiple parallel forces that are equal in magnitude, opposite in sense and do not share a line of action.

2. to two parallel forces that are equal in magnitude, and acting in same direction

3. to two parallel forces that are unequal in magnitude, and do not share a line of action.

4. to two parallel forces that are equal in magnitude, opposite in sense and do not share a line of action.

Q.

A body is acted upon by two forces each of magnitude F, but in opposite directions. State the effect of the forces if
(a) both forces act at the same point of the body.

(b) the two forces act at two different points of the body at a separation r.

Q.

A nut is opened by a wrench of length $20cm$. If the least force required is $2N$ , find the moment of force needed to loosen the nut .

Q.

Why is a door provided with a handle near its free end?

Q.

A body is acted upon by two unequal forces in opposite directions and on two sides of the pivot point. The effect is that

1. the body will have rotational as well as translational motion.
2. the body will have neither rotational motion nor translational motion.
3. the body will have only rotational motion.
4. the body will only have translational motion.

Q. The slope of momentum-time graph gives

1. accelaration
2. velocity
3. rate of force
4. force

Q.

State the condition when on applying a force, the body has :

(a) the translational motion,

(b) the rotational motion.

Q.

Would a door open if a force is applied on its hinges?

Q.

A body is acted upon by two forces each of magnitude F, but in opposite directions. State the effect of forces if the forces act along same line of action.

1. Resultant force = 0

2. Moment of forces = 0

3. There will be no motion

4. All the above

Q.

An object moves with a uniform velocity when the net force acting on it is___ .

1. no net external force is acting on it

2. external force acting on it

3. force of friction

4. none of these

Q. If the net force acting on a rigid body is zero, it implies that ___

1. the body must have linear acceleration
2. the body must have linear and angular acceleration
3. the centre of mass is moving at a constant velocity
4. the body can't have angular acceleration

Q.

A cylinder rolling down the incline without slipping is an example of___.

1. Translational motion

2. Both translational and rotational motion

3. Rotational motion

4. Neither translational nor rotational motion

Q.

A force produces change in linear motion or translation motion of a body .What does the moment of a force do?

Q. Define translatory motion

Q. Larger the magnitude of the force applied, more is the turning effect on the body.

1. True
2. False

Q.

What is Coriolis Force?

Q. The crankshaft converts:

1. rotary motion to horizontal motion.
2. rotary motion to spiral motion.
3. linear motion to rotary motion.
4. linear motion to spiral motion.

Q.

A force tends to rotate a body about any axis if

1. It intersects the line of action of force and is parallel to it.

2. It does not intersect the line of action of force and is not perpendicular to it.

3. It intersects the line of action of force and is perpendicular to it.

4. It does not intersect the line of action of force and is not parallel to it.

Q.

Consider the situation given in the figure, when the card is flicked with the finger. What happens to the coin?

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1. None of these.

2. The coin stays where it was before.

3. The coin placed over it falls in the tumbler.

4. The coin starts to move in the upward direction.

Q.

The motion of potters wheel is example of oscillatory motion.

1. True
2. False

Q.

What type of forces constitutes a couple?

Q. Which of the following statements are correct ?
A. A particle is known to be at rest at time t = 0, if the body does not change its position with time.
B. In a journey, numerical value of displacement $\le$ distance

1. A, C, D
2. A, B, C
3. B, C
4. B, D

Q.

What is meant by rotational motion? How is it different from transnational motion

Q.

Analogous to linear velocity 'v', we use___.

1. 'ω' for angular or rotational velocity

2. 'u' for angular or rotational velocity

3. 'β' for angular or rotational velocity

4. 'θ' for angular or rotational velocity

Q.

What is the moment of force developed about the hinge of a door if a person tries to open it with a force of 100 N, the force being applied normal to the door at handle which is at a distance of 60 cm from the hinge?

1. 0 Nm

2. 30 Nm

3. 60 Nm

4. Can’t say as angle is not specified

Q. If a nut can be opened with a minimum force of $6N$ using a wrench of length $12cm$, what is the moment of force needed to turn the nut?

1. $0.72Nm$
2. $50N{m}^{-1}$
3. $0.72N{m}^{-1}$
4. $72Nm$

Q.

The drilling machine shows a combination of motion. Why ?

Q.

What is uniform circular motion?