Question
What do you understand by friction force? Write the laws of friction.

Answer

self

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

An inductor of inductance 2.00H is joined in series with a resistor of resistance $200\Omega$ and a battery of emf 2.00V. At t = 10ms, find
  1. The current in the circuit.
  2. The power delivered by the battery.
  3. The power dissipated in heating the resistor.
  4. The rate at which energy is being stored in magnetic field.
What is scalar product? Explain by giving examples. Explain the scalar product of perpendicular and parallel vectors with an example.
A simple harmonic wave is expressed by equation:
$\text{y}=7\times10^{-6}\sin\Big(800\pi\text{t}-\frac{\pi}{42.5}\text{x}\Big)$
where y and x are in cm. and t in seconds. Calculate the following:
  1. Amplitude.
  2. Frequency.
  3. Wavelength.
  4. Wave velocity.
  5. Phase difference between two particles separated by 17.0cm.
Earthquakes generate sound waves inside the earth. Unlike a gas, the earth can experience both transverse $(S)$ and longitudinal ( $P$ ) sound waves. Typically the speed of $S$ wave is about $4.0 km s ^{-1}$, and that of $P$ wave is $8.0 km s ^{-1}$. A seismograph records $P$ and $S$ waves from an earthquake. The first $P$ wave arrives $4$ min before the first S wave. Assuming the waves travel in straight line, at what distance does the earthquake occur?
A body cools from 80 °C to 50 °C in 5 minutes. Calculate the time it takes to cool from 60°C to 30 °C. The temprature of the surroundings is 20°C.
The molecules of a given mass of a gas have root mean square speeds of 1 $100ms− at 27C ^\circ$ and $1.00$ atmospheric pressure. What will be the root mean square speeds of the molecules of the gas at $127^\circ C$ and $2.0$ atmospheric pressure?
A block slides down from top of a smooth inclined plane of elevation $\theta$ fixed in an elevator going up with an acceleration $a_0$. The base of incline has length L. Find the time taken by the block to reach the bottom.
A cubical block of density $\rho$ iis floating on the surface of water. Out of its height L, fraction x is submerged in water. The vessel is in an elevator accelerating upward with acceleration a . What is the fraction immersed?
  1. Define moment of inertia. Write the parallel and perpendicular axis theorem.
  2. Derive an expression for moment of inertia of a disc of radius r, mass m about an axis along its diameter.
One end of a long string of linear mass density $8.0 \times 10^{–3}kg m^{–1}$ is connected to an electrically driven tuning fork of frequency $256Hz$. The other end passes over a pulley and is tied to a pan containing a mass of $90kg$. The pulley end absorbs all the incoming energy so that reflected waves at this end have negligible amplitude. At $t = 0$, the left end (fork end) of the string $x = 0$ has zero transverse displacement $(y = 0)$ and is moving along positive y-direction. The amplitude of the wave is $5.0cm$. Write down the transverse displacement y as function of x and t that describes the wave on the string.