Test: Motion - 1 - Year 11 MCQ

A straight line on a distance-time graph signifies that the object is moving at a constant speed. The slope of the line indicates the speed of the object, where a steeper slope suggests a faster speed and a gentler slope indicates a slower speed. Therefore, when analyzing a distance-time graph, a straight line represents a consistent speed of movement.

Velocity differs from speed in that it includes both magnitude and direction, whereas speed only denotes magnitude without specifying direction. For instance, if an object is moving at 20 m/s east, its velocity is 20 m/s east, indicating both the speed and the direction of motion.

A negative value for velocity signifies that the object is moving in the opposite direction of the positive reference point. This indicates that the object's motion is in the reverse direction compared to the positive direction, as defined by the reference point.

Acceleration is defined as the rate at which an object changes its velocity over time. It shows how quickly an object's speed changes, whether it is speeding up (positive acceleration) or slowing down (negative acceleration or deceleration).

Negative acceleration, also known as deceleration, occurs when an object slows down. This means that the object's speed is decreasing over time, leading to a negative acceleration value.

When an object is moving at a constant speed, the speed can be calculated by dividing the distance traveled by the time taken. The formula for speed in such cases is Speed = Distance/Time.

The slope of a line on a distance-time graph indicates the speed of the object being represented. A steeper slope implies a higher speed, while a gentler slope signifies a slower speed.

Objects moving at varying speeds are represented on a distance-time graph through curves. These curves indicate changes in the speed of the object over time, with the slope of the curve showing how the speed is changing.

When an object's speed varies, the average speed is calculated by dividing the total distance covered by the total time taken. The formula for average speed is Average Speed = Total Distance/Total Time.

To determine the rate of change in an object's velocity, acceleration is calculated by dividing the change in velocity by the change in time. The formula for acceleration is Acceleration = Change in Velocity/Change in Time.