Motion

What are the two crucial elements of motion?

• change in position and speed

• change in position and time

• change in time and direction

• change in speed and direction

How is the change in position of a body observed?

• relative to a fixed point

• relative to a moving object

• relative to a reference frame

• relative to the observer

A frame of reference is:

• a fixed point in space

• a moving object

• a chosen area in three-dimensional space

• an observer

The motion of a body is:

• absolute

• relative

• constant

• independent of reference frame

The state of rest is:

• a condition where a body is moving at a constant speed

• a condition where a body is not moving

• a condition where a body is accelerating

• a condition where a body is changing direction

A body at rest is:

• truly at rest at the particle level

• not truly at rest at the particle level

• always moving in a straight line

• always changing direction

State of motion is:

• the opposite of state of rest

• a condition where a body is at rest

• a condition where a body is not moving

• a condition where a body is changing direction

Relative motion means:

• motion is always observed from a fixed point

• motion is always observed from a moving object

• motion depends on the reference frame

• motion is independent of reference frame

The theory of relativity is based on:

• the absolute nature of motion

• the relative nature of motion

• the constant speed of light

• the acceleration of objects

Even when a person is standing still, their blood is:

• at rest

• in motion

• changing direction

• accelerating