5.2 - circular motion

How to convert degrees to radians?

Divide by 360 and multiply by 2pi

What is meant by the period of an object in circular motion?

The time taken for one full rotation

What is meant by angular velocity?

The angle travelled through divided by the time taken. Rate of rotation.

What kind of force is required to keep an object moving in a circle at a constant speed?

A constant centripetal force (a force always applied to the centre of the circle)

True or false: The centripetal force and velocity of an object moving in a circle are always in the same direction

False. Velocity is always at a tangent to the circle, force is always along a radius. Perpendicular

How are linear and angular velocity related?

V = wr

V = linear velocity, w = agular velocity, and r = radius

An object moving in a circle at a constant speed is not accelerating. True or false?

False.

Direction always changing hence velocity is always changing s its accelerating.

What is acceleration in terms of linear velocity?

a = V²/r

What are the equations for centripetal force?

F=mv²/r or F=mw²r

Describe how one can investigate circular motion?

Ty a bung with mass (m) to a piece of string and threading it through a glass tube.

Other end of string has a weight with Mass (M) suspended from it. This provides centripetal force F=mg, as the tension throughout string is constant.

String is whirled in a circle and time take for one complete rotation is recored via stopwatch.

Mass (M) is altered and repeat experiment

Equate Mg and centripetal force, Mg=MV²/r

Measuring radius of circle and using time for one oscillation velocity can be determined when plotting V² against M, should produce a straight line graph.