(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

A car of mass 600 kg is moving with a speed of 10 ms^-1 while a scooter of mass 80 kg us moving with a speed of 50 ms^-1. Compare their momentum.

A car of mass 600 kg is moving with a speed of 10 m^-1 while a scooter of mass 80 kg is moving with speed of 50 m s^-1. which vehicle will require more force to stop it in the (1) same interval of time (2) same distance

Is moment of force a scalar or a vector?

State two factor on which moment of force about a point depends.

Write the expression for calculating the moment of force about a given axis.

State one way to reduce the moment of given force about a given axis of rotation.

What do you understand by the clockwise and anticlockwise moment of force? When is it taken positive?

The stone of hand flour grinder is provided with a handle near its rim. Give reason.

It is easier to turn the steering wheel of a large diameter than that of a small diameter. Given reason.

A spanner (or wrench) has a long handle. Why?

A, B and C are the three forces each of magnitude 4 N acting in the plane of the paper as shown in Figure. The point O lies in the same plane.

1. Which force has the least moment about O? Give a reason.
2. Which force has the greatest moment about O? Give a reason.
3. Name the forces producing
   (a) Clockwise
   (b) anticlockwise moments.
4. What is the resultant torque about the point O?

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

Give two examples of a couple's actions in our daily life.

The moment of a force about axis depends ______.

The moment of a force of 10 N about a fixed point O is 5 N m. Calculate the distance of the point O from the line of action of the force.

A nut is opened by a wrench of length 10 cm. if the least force required is 5.0 N. find the moment of force needed to turn the nut.

A wheel of diameter 2 m is shown in the figure with the axle at O. A force F = 2 N is applied at B in the direction shown in the figure. Calculate the moment of force about

1. the centre O, and
2. the point A.

The diagram shows two forces F₁ = 5 N and F₂ = 3N acting at point A and B of a rod pivoted at a point O, such that OA = 2m and OB = 4m

Calculate:

1. Moment of force F₁ about O
2. Moment of force F₂ about O
3. Total moment of the two forces about O.

Two forces each of magnitude 10 N act vertically upwards and downwards respectively at the two ends A and B of a uniform rod of length 4 m which is pivoted at its midpoint O as shown in the figure. Determine the magnitude of the resultant moment of forces about the pivot O.

The figure shows two forces each of magnitude 10 N acting at the point A and B at a separation of 50 cm, in opposite directions. Calculate the resultant moment of two forces about the point.

1. A,
2. B and
3. O situated exactly at the middle of the two forces.