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Last edited 26 days ago by Learn LoopHQ.

Answer key

Chapter: 04. Force

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

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

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

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

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

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

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

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

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

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.

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

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

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

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

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

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

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

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

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

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

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

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

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

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