Force Exe-1A Concise Short Type Que Class 10 ICSE Selina Solutions.. Concise Selina Solutions of Ch-1 Force of latest edition. Visit official website CISCE for detail information about ICSE Board Class-10.
Force Exe-1A Concise Short Type Que Class 10 ICSE Selina Solutions
| Board | ICSE |
| Class | 10 |
| Subject | Physics |
| Book Name | Concise |
| Publications | Selina Publishers |
| Exe-1A | Moment Of a Force and Equilibrium. |
| Topics | Solution of Short Type Que. |
| Session | 2025-26 |
Force Exe-1A Short Type Que
Concise Class 10 ICSE Selina Physics Solutions
Que-1: Define moment of force and state its S.I. unit.
Ans. The moment of force is equal to the product of the magnitude of the force applied and the perpendicular distance of the line of action of the force from the axis of rotation(or pivoted point) The S.I unit of moment of force is Newton × meter
Que-2: State two factors affecting the turning effect of a force.
Ans. The two factors on which moment of force about a point depends
(a) The magnitude of the force applied.
(b) The distance of the line of action of the force from the axis of rotation
Que-3: When does a body rotate? State one way to change the direction of rotation of a body. Give a suitable example to explain your answer.
Ans.. If a body is pivoted at a point and the force is applied on the body at a suitable point,
by changing the direction of force The direction of rotation can be changed .
Que-4: What do you understand by the clockwise and anticlockwise moment of force? When is it taken positive?
Ans.
- If the effect on the body is to turn it clockwise, moment of force is called the clockwise moment and it is taken as negative,
- if the effect on the body is to turn it anticlockwise, moment of force is called the anticlockwise moment and it is taken as positive.
Que-5: Why is it easier to open a door by applying the force at the free end of it?
Ans. It is easier to open the door by applying the force at the free end because distance is directly proportional with moment of force.
Que-6: The stone of hand flour grinder is provided with a handle near its rim. Give a reason.
Ans. The stone of hand flour grinder is provided with a handle near its rim because more distance produce more torque.
Que-7: It is easier to turn the steering wheel of a large diameter than that of a small diameter. Give reason.
Ans. It is easier to turn the steering wheel of a large diameter in comparison to the wheel of a smaller diameter as less force is required due to the larger distance.
Que-8: A spanner (or wrench) has a long handle. Why?
Ans. A spanner is provided with a long handle so as to create a larger turning moment with less force.
Que-9: A jack screw is provided with a long arm. Explain why?
Ans. A jack screw which is used to lift a heavy vehicle has a long arm so that less force is needed to rotate it to raise or lower the vehicle.
Que-10: The adjacent diagram shows a heavy roller, with its axle at O, which is to be raised on a pavement XY. 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. If pivoted at 0, now will it go up?
Ans. No, if pivoted at O it will not go up
Que-11: Define the moment of a couple. Write its S.I unit.
Ans. Moment of couple is product of either force and the perpendicular distance between the two forces. The S.I unit of moment of couple is Nm
Que-12: What do you mean by equilibrium of a body
Ans. When a number of forces acting on a body produce no change in its state of rest or of linear or rotational motion, the body is said to be in equilibrium.
Que-13: State the condition when a body is in
(i) static equilibrium.
(ii) dynamic equilibrium.
Give one example each of static and dynamic equilibrium.
Ans. (i). The body is said to be in static equilibrium When a body remains in the state of rest under the influence of several forces.
Example- A book lying on a Table is in static equilibrium.
(ii). When a body remains in the same state of motion under the influence of several forces, Then the body is said to be in dynamic equilibrium.
Example- Flying of aeroplane.
Que-14: State two conditions for a body, acted upon by several forces to be in equilibrium.
Ans. The two conditions for a body to be in equilibrium are
1. A resultant of all the forces acting on a body should be zero
2. An algebraic sum of moments of all the forces acting on the body about the point of rotation should be zero.
Que-15: State the principle of moments. Name one device based on it.
Ans. According to the principle of moments, if the algebraic sum of moments of all the forces, acting on the body, about the axis of rotation is zero, the body is in equilibrium. Therefore, as per the principle of moments
sum of anticlockwise moments = sum of clockwise moments
For example, sea saw.
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