Friction

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Friction works in __________________direction of motion.

In case of_______________ friction, the two surfaces are not in relative motion

In case of ______________________ friction, the two surfaces are in relative motion.

The motion of a wheel has to encounter __________________ friction.

A fish has _____________ body shape.

Which of these surfaces would offer the least friction?

• Sand paper

• Velvet paper

• Wax paper

• Normal paper

Which of these vehicles runs on an air cushion?

• Metro rail

• Hovercraft

• Helicopter

• Aeroplane

Which of these can be a good lubricant?

• Oil

• Grease

• Air cushion

• All of these

Which of the following surfaces is safe to walk on?

• Marble floor

• Paved footpath

• Ice skating ring

• Wet floor