Materials used to reduce friction are called
Lubricants
Fuels
Catalyst
None of these
Solids always exert pressure
Upwards
Downwards
At the centre
Can’t be predicted
Which word is used to describe push or pull?
Pressure
Force
Density
Volume
The contact force applied without touching it is called
Friction
Tension
Gravitational force
Force acting on unit area is called
Thrust
Heat
Dams are constructed with
Greater thickness at their top
Greater thickness at their bottom
Greater thickness at their centre
Same thickness from top to bottom
Forces that two bodies in contact apply on each other are called
Contact forces
Action - at - distance forces
Primary forces
The unit of pressure is
Newton
Newton / metre
Pascal
Newton metre
Which one of the following is used to reduce friction in rotating parts such as wheels rotates about a fixed shaft?
Grease
Ball bearings
Metal rods
Oil
Density of an object
Is different in different place
Is greater in liquids
Is a constant
Is less in liquids
