Physics Laws of Motion

The principle of circular motion follows Newtonian mechanics. It can be stated that an object will move in a circle only when there is a centripetal force that continuously acts perpendicular to its tangential velocity. That changes the direction but not its speed. The inward acceleration a_c = v squared/r obeys Newton's laws and ensures circular path motion. 

Circular motion has the following characteristics.

• Fixed radius with the same and constant distance from the centre
• Constant speed, when the motion is uniform
• A changing velocity vector with continuous direction of change
• Centripetal acceleration that is directed radially inwards, while the force that causes it is the centripetal force that maintains the curved path

$a=\mu g=0.4*10=4m/s^2$

Slipping stops when V_bag = V_conveyar

0 + at = 2

t = $\frac{2}{a}=\frac{2}{4}=.5sec$ $\frac{}{}\frac{}{}$

So, x = $\frac{1}{2}a{t}^2=\frac{1}{2}*4*\frac{1}{4}=0.5m$

Let additional force is $\overrightarrow{F}$ , so

$\overrightarrow{F}+5\left(+\widehat{i}\right)+6\left(-\widehat{i}\right)+7\left(+\widehat{j}\right)+8\left(-\widehat{j}\right)=\overrightarrow{0}$

$\Rightarrow \overrightarrow{F}-\left(\widehat{i}+\widehat{j}\right)=\overrightarrow{0}\Rightarrow \overrightarrow{F}=\widehat{i}+\widehat{j}\Rightarrow F=\sqrt[]{2}N,45°$

$\Delta p$ = Change in momentum of each ball

$\Delta p=2mv=2*0.05*10=1Ns$

$\Rightarrow F=\frac{\Delta p}{\Delta t}=\frac{2*0.05*10}{0.005}=200N$

Since liquid drop is in equilibrium, so

mg = F_B + 2πRT

$\Rightarrow \frac{4}{3}\pi R^3\rho g=\frac{2}{3}\pi R^3\sigma g+2\pi RT$

$\Rightarrow R=\frac{3T}{\left(2\rho -\sigma \right)g}=\frac{15}{\sqrt[]{\left(2\rho -\sigma \right)}}*10^{-2}m=\frac{15}{\sqrt[]{\left(2\rho -\sigma \right)}}cm$

Yes. Friction is a contact force that works against the relative motion between two surfaces. It can be static, which prevents motion. It can also be kinetic, which resists motion that's already happening. 

The four key contact forces that you will read in Class 11 Physics are normal force, friction, tension, and spring force. Each of these forces needs physical contact and follows Newton's Third Law. They come into play during motion, compression, stretching, or when objects rest on surfaces. These contact forces help in drawing the free-body diagrams (FBDs) and solving problems related to the laws of motion.

An object usually experiences four primary forces. First is the gravitational force (or weight) pulling it downward. Surfaces exert normal force, while frictional force works against motion. Then the applied or tension force starts any movement. These forces can either balance each other out or be unbalanced. 

In Class 11 Physics, we typically talk about two main categories of forces. One is contact forces, and the second is non-contact forces. Contact forces are friction, tension, normal force, and spring force. On the other hand, non-contact forces consist of gravitational, electrostatic, and magnetic forces. These types of forces help us in understanding Newton's laws of motion, free-body diagrams (FBDs), and the concept of equilibrium.