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Speed and Velocity

Grade 6 Science Worksheets

Speed and velocity are two of the most important concepts in physics that often cause confusion among students.

Speed is simply a measure of how fast an object is moving, while velocity takes into account the direction in which an object is moving. Understanding the difference between these two quantities is crucial for students to grasp the fundamental principles of physics and mechanics.

In this article, we will delve into the definitions of speed and velocity, their key differences, and practical examples to help make these concepts easier to understand. Whether you’re a student just starting to learn about these concepts or a teacher looking to simplify them for your students, this article is for you. So, let’s get started and explore the world of speed and velocity!

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Speed and Velocity - Grade 6 Science Worksheet PDF

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Speed is a scalar quantity that measures how fast an object is moving. It is defined as the distance traveled by an object in a given time interval. The formula for speed is:

Speed = Distance / Time

For example, if a car travels 60 miles in 1 hour, its speed would be 60 miles per hour (mph). If a person runs 100 meters in 10 seconds, their speed would be 10 meters per second (m/s).

Let us look at another example,

A person runs 400 meters in 2 minutes. What is their speed?

First, we need to convert 2 minutes to seconds:

2 minutes x 60 seconds/minute = 120 seconds

Speed = distance/time

Speed = 400 meters / 120 seconds

Speed = 3.33 meters/second

Therefore, the person’s speed is 3.33 meters per second.

Speed is an essential concept in physics and is widely used daily. It is used to describe the motion of cars, trains, airplanes, and other moving objects.

Speed can be measured in different units, such as miles per hour, kilometers per hour, meters per second, or even feet per second. It is important to note that speed does not consider the direction of motion, only the magnitude of motion.


Velocity is a vector quantity that measures both the speed and direction of an object’s motion. It is defined as the rate of change of an object’s position. The formula for velocity is:

Velocity = Displacement / Time

For example, if a car moves from point A to point B in a certain direction, its velocity would be the speed at which it is moving and the direction it is moving in. If a ball is thrown upward, its velocity changes continuously as it moves, with both its speed and direction changing over time.

Let us look at another example,

A plane flies 500 miles north in 3 hours. What is its velocity?

Velocity = displacement/time

Displacement = 500 miles north

Time = 3 hours

Velocity = 500 miles north / 3 hours

Velocity = 166.7 miles/hour north

Therefore, the plane’s velocity is 166.7 miles per hour to the north

Velocity is an important concept in physics, especially in the study of motion and dynamics. It allows us to understand and quantify the motion of objects in different directions and at different speeds.

Like speed, velocity can be measured in different units, such as meters per second (m/s), feet per second (ft/s), or even miles per hour (mph). It is important to keep in mind that velocity has both magnitude and direction, unlike speed which only has magnitude.

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Difference between Speed and Velocity

    Speed is a scalar quantity that refers to “how fast an object is moving.” It is the magnitude of the velocity and is expressed in distance units per unit of time (e.g. m/s, km/hr).


    Conversely, velocity is a vector quantity that refers to “the rate at which an object changes its position in a particular direction.” It is the rate of change of displacement and has both magnitude (speed) and direction.

    Example 1: A car moving at 60 km/hr on a straight road has a 60 km/hr speed but a 60 km/hr velocity in the direction of its motion.

    Example 2: A train moving at 80 km/hr and entering a curved track will have a speed of 80 km/hr, but its velocity changes as it moves along the curved path, pointing in a different direction at different times.

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    Speed and Velocity FAQS

    What is the difference between speed and velocity?

    Speed is a scalar quantity that measures the rate of change of an object’s position, while velocity is a vector quantity that describes both the rate of change and the direction of an object’s position.

    Can speed be negative?

    No, speed is always a positive scalar quantity, while velocity can be negative if an object is moving in the opposite direction of a given reference frame.

    How do you calculate speed and velocity?

    Speed can be calculated as the magnitude of the displacement divided by the time taken: speed = |displacement| / time. Velocity can be calculated as the derivative of the position function with respect to time: velocity = d(position)/dt.

    Is velocity always constant?

    No, velocity can change if an object accelerates or decelerates.

    How does speed and velocity relate to acceleration?

    Acceleration is the rate of change of velocity. An object with a constant velocity has zero acceleration, while an object with a changing velocity has non-zero acceleration.

    Can you have velocity without speed?

    No, velocity always has a magnitude (speed) and a direction.

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