Force &Friction

Friction depends on the

• Volume

• Nature of surface

• Area

• Nature of material

Friction produces

• Heat

• Cool

• Pressure

• Mechanical Energy

The substances which reduce friction are called

• Lubricants

• Gums

• Liquids

• Plastics

Friction is independent of

• Roughness

• Area of contact

• Weight of the object

• All the above

Powder is used in carrot board

• To increase friction

• To decrease friction

• To decorate the board

• None of these

Which is not the non-contact force

• Electrostatic force

• Magnetic force

• Force due to gravity

• Muscular force

Force is

• Power

• Pressure

• Push or Pull

• Friction

The pressure exerted by the atmospheric air is known as

• Atmospheric pressure

• Biosphere

• Troposphere

• All of these

The standard unit of force is

• metre/second

• Newton

• metre/second2

• gram/weight

Friction can be reduced by using

• Oil

• Grease

• Powder

• All of these