Friction

What does the slope of the graph of friction force versus normal force represent?

Why does a cyclist bend inwards while riding along a curved road

A cyclist speeding at $6 \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{$\sec $}\right.$ in a circle of $18\mathrm{m}$ radius makes an angle $\mathrm{\theta }$ with the vertical, calculate $\mathrm{\theta }$.

A cyclist riding at a speed $14\sqrt{3} \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{s}$}\right.$ takes a turns around a circular road of radius $20\sqrt{3}\mathrm{m}$. What is the inclination to the vertical?

A cyclist speeding at $18 \raisebox{1ex}{$\mathrm{km}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{h}$}\right.$ on a level road takes a sharp circular turn of radius $3\mathrm{m}$ without reducing the speed and without bending towards the centre of the circular path. The co-efficient of static friction between the types and the road is $0.1$. Will the cyclist slip while taking the turn?

When a bicycle is in motion, the force of friction exerted by the ground on the two wheels is such that it acts

A body, resting on a rough horizontal plane required a pull of $181\mathrm{N}$ inclined at ${30}^{\mathrm{o}}$ to the plane just to move it. It was recorded that a push of $220\mathrm{N}$ inclined at ${30}^{\mathrm{o}}$ to the plane just to moved the body. Estimate the weight of the body in $\mathrm{N}$.

A body of mass $1\mathrm{kg}$ is kept on a rough surface is being pulled by a force of $2\mathrm{N}$. What will be the value of co-efficient of friction if it just begins to move take $\mathrm{g}=10 \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{${\mathrm{s}}^2$}\right.$.

A body, resting on a rough horizontal plane required a pull of $181\mathrm{N}$ inclined at ${30}^{\mathrm{o}}$ to the plane just to move it. It was recorded that a push of $220\mathrm{N}$ inclined at ${30}^{\mathrm{o}}$ to the plane just moved the body. Estimate the co-efficient of friction.

A body of mass one $\mathrm{kg}$ is kept on a rough surface having co-efficient of friction$=0.25$ being pulled by a force of $2\mathrm{N}$. What will be the value of friction force in $\mathrm{N}$?

Why is it easier to pull than to push a lawn roller

Which of the following statements about friction is true?

The minimum force required to start pushing a body up a rough (frictional coefficient $\mu$ ) inclined plane is $F_1$ while the minimum force needed to prevent it from sliding down, is $F_2.$ If the inclined plane makes an angle $\theta$ with the horizontal such that $\tan \theta =2\mu$, then the ratio $\frac{F_1}{F_2}$ is

For two given surfaces, the value of the coefficient of friction is the highest for:

Why do the parts of machines regularly oiled/greased?

Rub both your palms together. Now apply a few drops of oil on your palm and rub them again.
In both the conditions what difference did you feel on rubbing your palms?
What may be the reason?

Why are the parts of the cycle oiled at regular intervals?

Whenever Neelam opens the door of her house, she has to exert a lot of effort and the door opens with a creak. Neelam's mother asked her to put oil in latches of the door. Neelam did what her mother was told. The problem solved.
On opening the door, why did it produce a sound?

Can we predict the direction of motion of a body from the direction of force on it?

Can the coefficient of friction be more than one?