# Why does the horizontal component of velocity for a projectile remain constant and why does only the vertical component change?

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## Why does the horizontal component of velocity for a projectile remain constant and why does only the vertical component change?

There is only one force acting on the object in the air, that is due to gravity, acting downwards. Since no force is acting in a horizontal direction therefore the magnitude of velocity and angle is remaining constant.

## What is the law of acceleration in tennis ball?

The second law of motion states that force equals mass times acceleration. Acceleration is a measurement of how fast a ball is gaining speed, rather than how fast it is going. In the world of tennis, you can apply Newton’s second law to a service. During your serve, the mass of the tennis ball remains constant.

## What is the velocity of a tennis ball?

Between 122 feet per second( 83.2 mph ) at air temperature of 20C and 123 feet per second ( 83.8 mph ) at 0C. That’s assuming that the ball is hit perpendicular to the baseline, the net is 3.5 feet high, no spin on the tennis ball and no cross wind.

## How does the downward component of a projectile compare with free fall?

The downward component of a projectile’s motion is free fall (that is, it is exactly the same as free fall).

## Why does the horizontal velocity remain constant in projectile motion?

The velocity of the horizontal component of the projectile motion is constant because there is no external force which acts on the horizontal component of the velocity, but the external force acts on the vertical component of the velocity.

## Are both horizontal and vertical velocities constant for a projectile?

The horizontal velocity of a projectile is constant (a never changing in value), There is a vertical acceleration caused by gravity; its value is 9.8 m/s/s, down, The vertical velocity of a projectile changes by 9.8 m/s each second, The horizontal motion of a projectile is independent of its vertical motion.

## What is Newton’s first law of tennis?

Newton’s first law states that an object at rest stays at rest and an object in motion stays in motion at the same speed, with the same direction unless acted upon by an unbalanced force. Using a tennis racket to strike a tennis ball is a prime example of unbalanced force acting upon an object in motion.

## Why does the tennis ball accelerate down the ramp?

Forces are vectors and have a direction and a magnitude. The force of gravity points straight down, but a ball rolling down a ramp doesn’t go straight down, it follows the ramp. Therefore, only the component of the gravitational force which points along the direction of the ball’s motion can accelerate the ball.

## What are the forces acting on a tennis ball?

Thrust – momentum of the racquet pushing the ball forward. Gravity – the weight of the ball acts downward from the ball’s center of gravity. Drag – refers to the force, in this case – air resistance, acting in the opposite direction (flight direction) of the movement of an object.

## What is the formula for the velocity of a ball?

The velocity of the falling ball as a function of time is v = -9.8 (m/s2) t j and its position as a function of time is r = (4.9 m – ½ 9.8 (m/s2) t2) j.

## What is the final velocity of a ball thrown?

At the highest point in its trajectory, the ball has zero velocity, and the magnitude of velocity increases again as the ball falls back toward the earth (see figure 1).

## What is the radius of a tennis ball?

In this question, we’re told that the diameter of one tennis ball is 6.7 centimeters. The radius of a sphere is half its diameter, so we can calculate the radius by dividing 6.7 by two. This is equal to 3.35 centimeters.

## Why does the vertical component of a projectile’s velocity change?

The force of gravity does cause a change in the vertical velocity of a projectile. Being a downwards force, gravity causes a falling object to speed up. So after being launched horizontally, the projectile immediately begins its downward fall with an increasing speed.

## Why does the vertical component of velocity for a projectile change with time whereas the horizontal component of velocity doesn t?

Why does the vertical component of velocity for a projectile change with time, whereas the horizontal component of velocity doesn’t? The force of gravity on a projectile acts only vertically, hence only the vertical component of a projectile changes with time.

## Why is the vertical component of a projectile velocity constant?

In case of projectile motion the vertical component of particle’s velocity changes continuously because of the force acting in vertical direction which is its own weight ( mg ). object ; its horizontal velocity remains constant.

## Why does the vertical component of velocity for a projectile not remain constant?

In the vertical or y direction, however, the projectile experiences the effect of gravity. As a result, the y component of the velocity vy is not constant, but changes. The y component of the acceleration ay is the downward acceleration due to gravity.