Write two effects produced by a force when it acts on a body. Give an example of each effect.

Show that the second law of motion gives the measure of a force.

Identify the forces that act according to Newton's third law of motion when

$\left(i\right)$ a horse accelerates 

$\left(ii\right)$ a swimmer swims at a constant speed.

A bullet of mass $5 \mathrm{g}$ travelling with a velocity of $18 \mathrm{km}/\mathrm{h}$ penetrates a wooden block and comes to rest in $0.01 \mathrm{s}$. Find

$\left(i\right)$ the distance through which it penetrates in the wooden block;

$\left(ii\right)$ the value of retarding force of the block.