Which of the following groups of forces could be in equibrium
$3\, N, 4\, N, 5 \,N$
$4\,N, 5 \,N, 10 \,N$
$30\,N, 40 \,N, 80 \,N$
$1\,N, 3\, N, 5\, N$
Write day to day life example in which motion is controlled.
Two masses $M$ and $m$ are connected by a weightless string. They are pulled by a force $F$ on a frictionless horizontal surface. The tension in the string will be
A pebble of mass $0.05\; kg$ is thrown vertically upwards. Give the direction and magnitude of the net force on the pebble,
$(a)$ during its upward motion,
$(b)$ during its downward motion,
$(c)$ at the highest point where it is momentarily at rest.
Do your answers change if the pebble was thrown at an angle of $45^o$ with the horizontal direction? Ignore air resistance.
A weight can be hung in any of the following four ways by string of same type. In which case is the string most likely to break?