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Last edited 26 days ago by Learn LoopHQ.

Chapter: 04. Force

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A _ _ _ _ _ _ _ _ _ _ _ _ _ _ is a physical quantity which changes or tends to change the state of rest or uniform motion of a body.

Force

When a force is applied to push an object, the direction of motion is always _ _ _ _ _ _ _ _ _ _ _ _ _ _ from us.

away

We cannot see force, but we can see the _ _ _ _ _ _ _ _ _ _ _ _ _ _ of force.

effects

Force cannot change the _ _ _ _ _ _ _ _ _ _ _ _ _ _ of an object.

mass

If you push a wall, it will not move because the force applied is not _ _ _ _ _ _ _ _ _ _ _ _ _ _ to move the object.

sufficient

If we apply a force in the same direction as the motion of an object, the object begins to move _ _ _ _ _ _ _ _ _ _ _ _ _ _.

faster

A force applied to an object by another object that is not in direct contact with it is called a _ _ _ _ _ _ _ _ _ _ _ _ _ _ force.

non-contact

_ _ _ _ _ _ _ _ _ _ _ _ _ _ force and force of friction are examples of contact forces.

Muscular

The force of friction always _ _ _ _ _ _ _ _ _ _ _ _ _ _ motion.

opposes

The strength of frictional force depends upon the _ _ _ _ _ _ _ _ _ _ _ _ _ _ of the two surfaces in contact.

nature (or roughness or smoothness)

_ _ _ _ _ _ _ _ _ _ _ _ _ _ surfaces produce more friction as compared to smooth surfaces.

Rough

The force of friction does not depend on the _ _ _ _ _ _ _ _ _ _ _ _ _ _ of contact of the surfaces.

area

When an object is at rest on a surface, the force between the surfaces with no relative motion is called _ _ _ _ _ _ _ _ _ _ _ _ _ _ friction.

static

When an object _ _ _ _ _ _ _ _ _ _ _ _ _ _ over a surface, the friction produced is called sliding friction.

slides

_ _ _ _ _ _ _ _ _ _ _ _ _ _ friction is much less than sliding friction.

Rolling

We can write on a paper due to the _ _ _ _ _ _ _ _ _ _ _ _ _ _ between the paper and the pencil.

friction

Shoe soles and wheels of vehicles _ _ _ _ _ _ _ _ _ _ _ _ _ _ out due to friction.

wear

Friction produces _ _ _ _ _ _ _ _ _ _ _ _ _ _ which affects the efficiency of machines.

heat

We can reduce friction to a certain extent but cannot make it _ _ _ _ _ _ _ _ _ _ _ _ _ _.

zero

Sir Isaac Newton discovered the universal law of _ _ _ _ _ _ _ _ _ _ _ _ _ _.

gravitation

Friction prevents the _ _ _ _ _ _ _ _ _ _ _ _ _ _ of machine parts that move on each other.

slipping

A large amount of _ _ _ _ _ _ _ _ _ _ _ _ _ _ is wasted in overcoming friction.

energy

In the activity to show that rough surfaces produce more friction, a marble travels _ _ _ _ _ _ _ _ _ _ _ _ _ _ distance when rolled on a tile placed on a blanket compared to a smooth surface.

less

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