Tag: motion and rest

If a body does not change its position with respect to its surroundings, the body is said to be at rest.

In which of the following cases , the net force is zero?
I) A ball freely falling from a certain height
II) A cork floating on the surface of water
III) An object floating in air

In the state of equilibrium
I) Net force is zero
II) Body at rest will continue to be in its state of rest
III) Body moving with uniform velocity will continue to be in its state of uniform velocity
IV) Body with linear momentum $\vec{p}$ will continue to have the same momentum $\vec{p}$.

At the starts of a motion along a line the initial velocity is u and acceleration is at. The final velocity v is 

The pendulum of a wall clock exhibits

Symmetry of the laws of nature with respect to translation in time give rise to

A platform is moving in upward direction with uniform velocity 40 ${ ms }^{ -1 }$. When it reaches at a height of 100 m from the ground, a pocket is dropped  from it. The total distance traveled by pocket during its free fall is (Take $g=10{ ms }^{ -2 }$) 

What does the odometer of an automobile measure?

A laser signal sent towards the moon returns after t seconds.If c is speed of light, then the distance of the moon from the observer is

Distance is a vector quantity. State whether true or false.