Question

A push or pull is termed as force. Force is generated due to interaction of one object with

other object. Force has both magnitude and direction. The magnitude of force is expressed

in the SI unit known as ‘Newton’ abbreviated as ‘N’. If two forces applied to an object act

in the same direction, then the resultant force acting on the two objects is equal to the

sum of the two forces. If the two forces applied to an object act in the opposite directions,

then the net force acting on the object is equal to the difference between the two forces

and if the two forces acting on an object are equal in magnitude and act in opposite

directions, then the net force acting on the object is zero(nil). A force cannot be seen it can

only be experienced or judged by the effect it produces on objects around us. A force can

produce following effects: a force can change the state of motion, a force can change the

speed of motion, a force can change the direction of motion, a force can change the shape

and size of an object.

All the different types of forces can be grouped into two broad categories namely contact

forces and Non-contact forces.

Contact force- A force which can be exerted by an object on another object only through

‘physical touching’ is called contact forces. Eg Muscular force and Frictional force.

Non-Contact forces- A force which can be exerted by an object on another object even

from a distance (without touching each other) is called non-contact force. Eg Magnetic

force and Electrostatic force.

Friction is a special type of contact force which always opposes motion. Gravitational force

is always attractive in nature i.e it always exerts an attractive force on other objects.

Everything possessing mass exerts gravitational force on others. Force generates pressure.

Pressure is defined as the force acting per unit area. The formula for calculating pressure

is given by the relation Pressure = Force /Area. i.e P= F/A. The SI unit of pressure is ‘Newton

per square meter’ (N/m2

), it is also known as Pascal (Pa). The same force can produce

different pressures depending on the area over which it acts. When a given force acts over

a large area of an object, it produces less pressure on the other hand the same amount of

force if it acts over a small area of the object it produces large pressure.

1.

The SI unit of force is ___________.

2.

Pascal or N/m2

is the unit of ________________.

3.

A force is generated due to __________ of one object with other object.

4.

Electrostatic and Magnetic forces are examples of ________________ forces.

5.

The contact force which always opposes motion is _________________.

6.

The non-contact force which is always attractive in nature is _________________ force.

7.

A force cannot be seen but it can only be experienced of judged by the ____________ it

produces on other objects.

8.

If two applied forces acting on an object acts in the same direction the resultant force on

the object is equal to the ___________ of the two forces.

9.

If two applied forces acting on an object acts in opposite direction the net force is given by

the ______________ between the two forces.

10. A push or pull is called __________________.

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Answer 1

Answer:

1- SI unit of force is Newton

2-pascal is a SI unit of pressure

2-