The moment of the force F → acting at a point P , about the point C is

A vector having the same direction as F →

EASY

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Select the SI unit of moment of couple from the given below options.

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Important Questions on Laws of Motion

EASY

Science>Physics>Laws of Motion>Torque

Torque per unit moment of inertia is equal to

EASY

Science>Physics>Laws of Motion>Torque

The dimensional formula

[{ML}^{2} T^{- 2}]

represents

MEDIUM

Science>Physics>Laws of Motion>Torque

A wheel of radius, $R$ with an axle of radius, $\frac{R}{2}$ is as shown in the figure and is free to rotate about a frictionless axis through its center and perpendicular to the page. Three forces $(F, F, 2 F)$ , are exerted tangentially to the respective rims as shown in the figure.

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The magnitude of the net torque acting on the system is nearly,

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Science>Physics>Laws of Motion>Torque

In a physical balance working on the principle of moments, when

5 mg

weight is placed on the left pan, the beam becomes horizontal. Both the empty pans of the balance are of equal mass. Which of the following statements is correct?

EASY

Science>Physics>Laws of Motion>Torque

Why does a spanner have a long handle?

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Science>Physics>Laws of Motion>Torque

A body is acted upon by two unequal forces in opposite directions, but not in the same line. The effect is that

EASY

Science>Physics>Laws of Motion>Torque

The moment of the force

\vec{F}

acting at a point

P

, about the point

C

HARD

Science>Physics>Laws of Motion>Torque

A flywheel of the moment of inertia

0.32 kg m^{2}

is rotated steadily at

120 rad s^{- 1}

by a

50 W

electric motor. The value of the frictional couple opposing rotation is

EASY

Science>Physics>Laws of Motion>Torque

A solid cylinder of mass

50 kg

and radius

0.5 m

is free to rotate about the horizontal axis(own axis). A massless string is wound around the cylinder with one end attached to it and the other hanging freely. Tension in the string required to produce an angular acceleration of

2

revolutions

s^{- 2}

MEDIUM

Science>Physics>Laws of Motion>Torque

The axis of rotation of a purely rotating body:

MEDIUM

Science>Physics>Laws of Motion>Torque

The moment about the point

M (- 2, 4, - 6)

of the force represented in magnitude and position

\vec{A B}

where the points

A

and

B

have the coordinates (1, 2,

- 3)

and

(3, - 4,2)

respectively, is

EASY

Science>Physics>Laws of Motion>Torque

Let the points A, B and P be (-2, 2, 4), (2, 6, 3) and (1, 2, 1) respectively. The magnitude of the moment of the force represented by

\vec{A B}

and acting at A about P is

MEDIUM

Science>Physics>Laws of Motion>Torque

To obtain a given moment of force for turning a body, the force needed can be decreased by

EASY

Science>Physics>Laws of Motion>Torque

A force

\vec{F} = 2 \hat{i} + \hat{j} - \hat{k}

acts at a point A, whose position vector is

2 \hat{i} - \hat{j}

. The moment of

\vec{F}

about the origin is

EASY

Science>Physics>Laws of Motion>Torque

The moment of a force about a given axis depends

EASY

Science>Physics>Laws of Motion>Torque

If a force

\vec{F} = 3 \hat{i} + 2 \hat{j} - 4 \hat{k}

is acting at the point

P (1, - 1,2)

then the magnitude of moment of

\vec{F}

about the point

Q (2, - 1,3)

EASY

Science>Physics>Laws of Motion>Torque

A force

\vec{F} = 2 \hat{i} + \hat{j} - \hat{k}

acts at a point

A

, whose position vectors is

2 \hat{i} - \hat{j}

. The moment of

\vec{F}

about the origin is

MEDIUM

Science>Physics>Laws of Motion>Torque

Three forces

\hat{i} + 2 \hat{j} - 3 \hat{k}, 2 \hat{i} + 3 \hat{j} + 4 \hat{k}

and

\hat{i} - \hat{j} + \hat{k}

are acting on a particle at the point (0, 1, 2). The magnitude of the moment of the forces about the point (1, -2, 0) is

HARD

Science>Physics>Laws of Motion>Torque

A force of magnitude

6

acts along the vector

(9, 6, - 2)

and passes through a point

A (4, - 1, - 7)

. Then the moment of a force about point

O (1, - 3, 2)

EASY

Science>Physics>Laws of Motion>Torque

The moment of a force represented by

\vec{F} = \hat{i} + 2 \hat{j} + 3 \hat{k}

about the point

2 \hat{i} - \hat{j} + \hat{k} =

Select the SI unit of moment of couple from the given below options.

Important Questions on Laws of Motion

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