A body, resting on a rough horizontal plane required a pull of $181\mathrm{N}$ inclined at ${30}^{\mathrm{o}}$ to the plane just to move it. It was recorded that a push of $220\mathrm{N}$ inclined at ${30}^{\mathrm{o}}$ to the plane just moved the body. Estimate the co-efficient of friction.

The type of force responsible for a change in the state of motion of the arrow is an example of a _____ force.

Write the quadrants in which the following points lie:

$\left(-4,7\right)$

Name the type of forces involved in a moving boat coming to rest when rowing is stopped.