motion C9

What is motion?

• A body is said to be in motion when its position changes with time with respect to a reference point.

• A body is in motion when it remains stationary relative to a reference point.

• Motion is the process of an object being at rest.

• Motion occurs only when an object travels in a straight line.

Formula for speed in circular motion?

• v = 2πr/t, where r = radius and t = time.

• v = πr^2/t, where r = radius and t = time.

• v = 2r/t, where r = radius and t = time.

• v = 4πr/t, where r = radius and t = time.

What is rest?

• A body is said to be at rest when it does not change its position with time.

• A body is at rest when it is in motion.

• A body is at rest when it is experiencing acceleration.

• A body is at rest when it is stationary but can move.

How to calculate acceleration from velocity-time graph?

• Area under the velocity-time graph

• Slope of velocity-time graph

• Average of velocity values

• Difference between initial and final velocities

Is speed a scalar or vector?

• Scalar

• Vector

• Both scalar and vector

• Neither scalar nor vector

Can average velocity be zero if distance is not zero?

• Yes, if the displacement is zero (e.g., round trip).

• No, average velocity is always equal to distance divided by time.

• Yes, but only if the speed is constant.

• No, average velocity cannot be zero if distance is not zero.

What is instantaneous speed?

• Speed of an object at a particular instant of time.

• Average speed over a period of time.

• Speed calculated using distance and time.

• Speed that varies with time.

Third equation of motion:

• v² = u² + 2as

• v = u + at

• s = ut + 1/2 at²

• v = s/t

Is velocity a scalar or vector?

• Scalar

• Vector

• Magnitude

• Speed

Second equation of motion:

• s = ut + 1/2 at²

• s = ut - 1/2 at²

• s = 1/2 (u + v)t

• s = vt - 1/2 at²