YEAR 7 TECHNOLOGY

How is friction due to air reduced?

• Streamlining

• Lubrication

• By using ball bearings

• By polishing

Friction can be increased by ___________

• Using air cushion

• Lubricants

• Using sand

• Using ball bearings

When moving along a curved path, he ___________

• Leans inwards

• Leans outwards

• Is still

• Leans sideways

The force of friction acts in a direction _____ to the direction of motion of object.

• Same

• Opposite

• Perpendicular

• Downwards

The force of friction depends upon

• Nature of surface of contact

• Material of objects in

• contact Both ‘a’ and ‘b’

• None of the above

The body will move only when

• Force of friction = applied force

• Force of friction < applied force

• Force of friction > applied force

• All of the above

Which one of these characteristics does a smooth surface has?

• Less frictional force

• More frictional force

• Sometimes less and sometimes more force

• All of above

Friction is a ______________

• Contact force

• Non - contact force

• Magnetic force

• None of these

The shape of the airplane is like a

• Bird

• Car

• Dog

• All of the above

The earth spins on a tilted angled called a(n)

• Axis

• Invert

• Revolution

• Bounce