Wheel and axle help to move objects with a very little force. This is because
Rolling friction > Sliding friction.
Sliding friction > Rolling friction.
Rolling friction = Sliding friction.
Rolling friction + Sliding friction = 0
Special kinds of grooves are made in automobile tyres. This is done in order to
Increases friction.
Reduce Friction.
Increases the speed of rotation of the tyres.
for more style
Which of the following activities is easier to perform?
Dragging a box.
Lifting a box.
Rolling a drum of same weight.
All of the above need same effort.
To avoid slipping while walking on ice, one should take smaller steps because
Frictional force of ice is large
Of larger normal reaction
Frictional force of ice is small
Of smaller normal reaction
What is meant by the term streamlining?
Improving an object so it can brake faster.
When a car brakes on ice and slides.
Putting slick tyres on a car so it can go faster.
Shaping an object to reduce air or water resistance.
Which of the following is not a method used for reducing friction
Use of lubricant.
Polishing the surfaces.
Streamlining.
Making the surface rough..
Which of the following material is likely to have least friction?
Wood.
Plastic.
Glass.
Paper.
The surface of the head of a match stick and sides of a match box are deliberately made rough to
Increase friction.
Decrease friction.
Increase amount of heat.
Decrease amount of heat.
Friction is a type of:
contact force.
non contact force.
resistance force.
motion.
With increase in weight of a body the limiting friction
Increases.
Decreases.
Does not change.
First increases and then decreases.
