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Question 11 Mark

Fill in the following blanks with suitable words: Friction prevents our foot from $............$ over the ground.

Answer

Friction prevents our foot from slipping over the ground.

Question 21 Mark

Fill in the following blanks with suitable words:
Friction always opposes $............$ between the surfaces in contact with each other.

Answer

Friction always opposes motion between the surfaces in contact with each other.

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Question 31 Mark

Fill in the following blanks with suitable words:
Sliding friction is $............$ than the static friction.

Answer

Sliding friction is less than the static friction.

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Question 41 Mark

Fill in the following blanks with suitable words: Objects which can move quickly through the water have a $............$ shape.

Answer

Objects which can move quickly through the water have a streamlined shape.

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Question 51 Mark

Fill in the following blanks with suitable words: Friction produces $............$

Answer

Friction produces heat.

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Question 61 Mark

Fill in the following blanks with suitable words: Ball bearings reduce friction because they $............$ rather than 'slide.

Answer

Ball bearings reduce friction because they roll rather than 'slide.

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Question 71 Mark

Fill in the following blanks with suitable words:
Shapes that are designed to reduce air resistance are called $............$ shapes.

Answer

Shapes that are designed to reduce air resistance are called streamlined shapes.

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Question 81 Mark

Fill in the following blanks with suitable words:
The shape of an aeroplane is similar to that of a $............$ in flight.

Answer

The shape of an aeroplane is similar to that of a bird in flight.

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Question 91 Mark

Fill in the following blanks with suitable words:
The friction when something moves through a liquid or gas is called $............$

Answer

The friction when something moves through a liquid or gas is called drag.

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Question 101 Mark

Fill in the following blanks with suitable words:
Sprinkling of powder on the carom board $............$ friction.

Answer

Sprinkling of powder on the carom board reduces friction.

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Question 111 Mark

Fill in the following blanks with suitable words:
Cars and speedboats are $............$ to reduce drag.

Answer

Cars and speedboats are streamlined to reduce drag.

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