Moment of Force

Q.

What are like and unlike parallel forces?

Q.

Why is it easier to open a door by applying the force at free end of it?

Q. What is axis of rotation? State one way to decrease the moment of a given force about a given axis of rotation.

Q.

what is the si base unit of force

Q.

A body is pivoted at a point. A force of $20N$ is applied at a distance of $20cm$ from the pivot. Calculate the moment of force about the pivot.

1. 2 Nm

2. 4 Nm

3. 6 Nm

4. 8 Nm

Q.

State two factors on which affect moment of force.

Q.

The atmospheric pressure held in terms of the water column is

1. $7.5m$

2. $8.5m$

3. $9.81m$

4. $10.30m$

Q.

What is a coplanar force?

Q.

A force of $10.5N$ is applied at the end of a circular disc pivoted at center. The diameter of the disc is $0.5m$, calculate the amount of torque generated due to this acting force.

1. $2.525Nm$

2. $26.25Nm$

3. $2.526Nm$

4. $2.625Nm$

Q.

Why are clockwise moments considered negative?

Q.

Explain the following :

(a) The spanner (or wrench) has a long handle.

(b) The steering wheel of a vehicle is of large diameter.

(c) The hand flour grinder is provided with a handle near the rim.

(d) It is easier to open the door by pushing it at its free end.

(e) A potter turns his wheel by applying a force through the stick near the rim of wheel.

Q.

A spanner of length 10 cm is used to open a nut by applying a minimum force of 5.0 N. Calculate the moment of force required.

Q.

What do you mean by the clockwise and anti-clockwise moment of force ?

Q.

Find the moment of force of 20 N about an axis of rotation at distance 0.5m from the force.

Q. and are SI and CGS units of moment of force respectively.

1. $Nm$
2. $N{m}^{-1}$
3. $Dynecm$
4. $Dyne{cm}^{-1}$

Q.

Define kilogram force

I am not understanding

Q.

The moment of a force of 25 N about a point is 2.5 N m. Find the perpendicular distance of force from that point.

Q.

The moment of force due to a force of $10N$ acting about a point O is $5Nm$. Calculate the distance of the point of application of the force from the point O.

1. 20 cm
   

2. 50 cm
   

3. 40 cm
   

4. 60 cm

Q.

Suraj can open a $2m$ wide door by applying a force of $2.5N$ at the free end of the door. Find the moment of force needed to open the door.

1. $2.5Nm$

2. $5Nm$

3. $7.5Nm$

4. $10Nm$

Q.

A rod is pivoted at a point. A force of $20N$ is applied at a distance of $20cm$ from the pivot perpendicular to the rod as shown in the figure below. Calculate the moment of force about the pivot.

1. 2 Nm
   

2. 4 Nm
   

3. 8 Nm

4. 6 Nm
   

Q.

Two forces $F_1=5N$ and $F_2=8N$ acting at points A and B on a rod pivoted at a point O, such that OA = $2m$ and OB = $4m$. Calculate the total moment of the two forces about O.

1. 22 Nm clockwise

2. 22 Nm anticlockwise

3. 42 Nm clockwise

4. 42 Nm anticlockwise

Q.

Pressure cannot be measured in :

1. $\mathrm{N}{\mathrm{m}}^{-2}$

2. bar

3. $\mathrm{Pa}$

4. $\mathrm{kg}.\mathrm{wt}.$

Q.

In Figure a force F is applied in a direction passing through the pivoted point O of the body.Will the body rotate ? Give reason to support your answer.

Q.

Define the term ‘moment of a force’. What is its SI unit?

Q. The moment of a force about a given fixed point depends:

1. Both on the force and its perpendicular distance from the axis of rotation.
2. Only on the magnitude of force.
3. Only on the perpendicular distance of force from the axis.
4. Neither on the force nor on the perpendicular distance of force from the axis.

Q.

A force has both __________ and ___________.

Q.

State the S.I. unit of moment of force.

Q.

Explain the meaning of a resultant force.

Q. It becomes easier to open or close a door turning about its hinges if the force is applied at the:

1. Two third of the door
2. Free edge of the door
3. Middle of the door
4. Point near the hinges

Q.

In a door, the handle is fixed at______distance from the hinges.