(Solved) - 41. Which is correct about speed and velocity? a. Speed and... (1 Answer) | Transtutors (2023)

FAQs

Which one of the following statement about the speed and velocity is correct? ›

Velocity of a moving body is its speed in a given direction. The velocity of a moving body is its speed in a given direction. Therefore, option d is correct.

Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement. Put another way, speed is a scalar value, while velocity is a vector.

Speed is defined as the magnitude of the velocity of an object and is often expressed in units of meters per second (m/s), but the units of speed are always in units of length/time. It is measured by the total distance covered by an object per unit time.

What is the difference between speed and velocity? Speed is just how fast you travel but velocity is the speed in a given direction.

velocity can be equal to speed if the body is in linear motion[ motion in straight line] but it cannot exceed speed.

Speed, being a scalar quantity, is the rate at which an object covers distance. The average speed is the distance (a scalar quantity) per time ratio. Speed is ignorant of direction. On the other hand, velocity is a vector quantity; it is direction-aware.

The velocity of an object is the rate of change of its position with respect to a frames of reference and is a function of time. Velocity is equivalent to a specification of its speed and direction of motion (e.g. 60 km/hr to the north).

In the equation V = d/t, V is the velocity, d is the distance, and t is the time. Determine the object's acceleration by dividing the object's mass by force and multiply the answer by the time it took for it to accelerate.

The similarity of speed and velocity of an object is the movement and the displacement from the previous position within a particular time. The SI unit of both particles is m/s which is a meter per second. Speed and velocity both are dependent on the distance covered, total time taken and direction of movement.

Velocity has no direction associated with it, while speed has a specific direction. Velocity is the change in speed over time, while speed is the change in distance over time.

Why is velocity called speed? ›

Velocity is a physical vector quantity; both magnitude and direction are needed to define it. The scalar absolute value (magnitude) of velocity is called speed, being a coherent derived unit whose quantity is measured in the SI (metric system) as metres per second (m/s or m⋅s⁻¹).

Velocity is a measure of both speed and direction of motion.

Since the ratio of the velocity to the time is equal to the acceleration, therefore, the slope made from the time axis at a point of the velocity-time graph will give the acceleration of the ball.

Scientists define acceleration as the rate at which velocity changes with time.

If you know the distance an object travels in a certain amount of time, you know the speed of the object. For example, if a car travels 70 miles in one hour, the car is traveling at a speed of 70 miles/hour (miles per hour).

The magnitude of average velocity is always less than or equal to the average speed because displacement is always smaller than or equal to distance.

Since the velocity of a body is uniform and there will be no change in velocity. Therefore acceleration will be zero.So, option (A) is correct. Also the body moves along the straight-line path so that there is no change in the direction of motion.

People may think that average speed and average velocity are just different names for the same quantity, but average speed depends on distance and average velocity depends on displacement. If an object changes direction in its journey, then the average speed will be greater than the magnitude of the average velocity.

Speed (or rate, r) is a scalar quantity that measures the distance traveled (d) over the change in time (Δt), represented by the equation r = d/Δt.

speed = distance ÷ time. distance = speed × time.

What is constant speed? ›

Definition: When the speed of an object remains the same - it does not increase or decrease - we say it is moving at a constant speed.

There are four types of speed which are uniform speed, variable speed, average speed, and instantaneous speed.

Velocity is a measure of how fast something moves in a particular direction. To define it needs both magnitude and direction. If an object moves east at 9 metres per second (9 m/s), then its velocity is 9 m/s to the east.

While the speed of the object is constant, its velocity is changing. Velocity, being a vector, has a constant magnitude but a changing direction. The direction is always directed tangent to the circle and as the object turns the circle, the tangent line is always pointing in a new direction.

Velocity is direction-aware and it is the rate of change of position of an object. Speed is a scalar quantity, i.e., it has only magnitude. Velocity is a vector quantity, i.e., it has both magnitude and direction. Speed measures the distance traveled (d) over the change in time (Δt).

Differences in Velocity

Objects have the same velocity only if they are moving at the same speed and in the same direction. Objects moving at different speeds, in different directions, or both have different velocities.

Velocity is the change in position (location) of an object per unit time. e.g., a bus traveling at a velocity of 60 miles per hour from North to South. The SI unit of velocity is meters per second (m/s). In general, it is important to indicate the direction of motion when specifying the velocity.

Explanation: If an object is moving with constant velocity, then its acceleration must be zero.

Isaac Newton (a 17th century scientist) put forth a variety of laws that explain why objects move (or don't move) as they do.

What is the relationship between heavy objects and inertia? ›

The greater the weight (or mass) of an object, the more inertia it has. Heavy objects are harder to move than light ones because they have more inertia. Inertia also makes it harder to stop heavy things once they are moving.

Centripetal acceleration ac is the acceleration experienced while in uniform circular motion. It always points toward the center of rotation. It is perpendicular to the linear velocity v and has the magnitude ac=v2r;ac=rω2.

Forces affect how objects move. They may cause motion; they may also slow, stop, or change the direction of motion of an object that is already moving. Since force cause changes in the speed or direction of an object, we can say that forces cause changes in velocity.

Therefore, the magnitude of average velocity of an object is equal to its average speed when the displacement of the object is equal to the distance covered by it in a given time interval. This happens when an object moves along a straight line in the same direction (without turning back).

Acceleration is defined as the rate of change of velocity.

A scalar quantity is different from a vector quantity in terms of direction. Scalars don't have direction, whereas a vector has. Due to this feature, the scalar quantity can be said to be represented in one dimension, whereas a vector quantity can be multi-dimensional.

This property of an object to resist change in motion is called inertia.

If the graph is velocity vs time, then finding the area will give you displacement, because velocity = displacement / time. If the graph is acceleration vs time, then finding the area gives you change in velocity, because acceleration = change in velocity / time.

First Law/Inertia: The tendency of an object to resist changes in its state of motion varies with mass. Mass is that quantity that is solely dependent upon the inertia of an object. The more inertia that an object has, the more mass that it has.

The property of a body to remain at rest or to remain in motion with constant velocity is called inertia.

When an object changes position over time relative to a reference point? ›

Motion occurs when an object changes its position relative to a reference point.

In simple words, velocity is the speed at which something moves in a particular direction. For example as the speed of a car travelling north on a highway, or the speed a rocket travels after launching.

In a simple harmonic motion, acceleration is ahead of velocity in phase by π2 rad. So, when velocity is maximum, acceleration is zero.

Speed is a scalar quantity because it has no defined direction and only magnitude. Velocity is a vector quantity having both magnitude and a direction.

Explanation: If an object is moving with constant velocity, then its acceleration must be zero.

To find velocity, we take the derivative of the original position equation. To find acceleration, we take the derivative of the velocity function. To determine the direction of the particle at t = 1 t=1 t=1, we plug 1 into the velocity function.

So speed relates to how fast an object moves, whereas velocity is the change in position of the object per unit time.

Velocity is defined as a vector measurement of the rate and direction of motion. Put simply, velocity is the speed at which something moves in one direction.

Differences Between Speed and Velocity

Speed is a scalar quantity, i.e., it has only magnitude. Velocity is a vector quantity, i.e., it has both magnitude and direction. Speed measures the distance traveled (d) over the change in time (Δt).