PROJECTILE MOTION PROBLEMS FREE

We find the velocity of the free falling object by the equation V=g.t. This means that, our velocity decreases -9,8m/s² in each second. In vertical we said that gravity acts on our objects and give it negative acceleration “-9,8m/s²”. Now it is time to give equations of motion under two titles. We tried to explain projectile motion with words. One of them is constant motion in horizontal and other one is free fall under the effect of gravity in vertical. All these explanations say that, we have two motions in projectile motion. However, in –Y direction gravity is acting on our object which makes Vy decrease and becomes zero at the top. Is there any force acting on our object in horizontal direction +X or –X? The answer is actually no. Why it is constant? What changes the velocity? In previous section we learned force concept that causes change in the state of motion. This part is so easy that you can understand from the picture, our horizontal component of velocity is constant during the motion. Now, let’s look at the horizontal part of our projectile motion. We see the effect of gravity on vertical motion. Finally, when the ball hits the ground Vy reaches its beginning magnitude but opposite in direction. Right side of our picture has “-“sign in front of the Vy because its direction is downward. At the same levels magnitudes of Vy are the same however, their signs are opposite.

After Vy becomes zero our ball changes its direction and make free fall now. At the top where it reaches its maximum height vertical component of our velocity becomes zero as in the case of free fall examples. In vertical as you can see in the picture, our velocity is decreasing in the amount of gravitational acceleration. When we look at the horizontal motion of the object we see that it looks like example solved in free fall motion section. We examine our motion in two parts, first one is horizontal motion and second one is vertical motion. If we look at the forces acting on our ball we see only the gravity as a force. Vx and Vy are the X and Y components of our velocity. V is its velocity and its direction is northeast. At the beginning the ball is thrown with an angle to the horizontal. First, look at the given picture which shows the motion path, velocities in different points and forces acting upon the object doing projectile motion.Īs you see in the picture given above, we have a projectile motion and velocity components at different positions. I will explain this sentence with a picture and examples. In projectile motion, gravity is the only force acting on the object. For example, you throw the ball straight upward, or you kick a ball and give it a speed at an angle to the horizontal or you just drop things and make them free fall all these are examples of projectile motion. We can have different types of projectile type. In this type of motion gravity is the only factor acting on our objects.

Now, we will try to explain motion in two dimensions that is exactly called “projectile motion”.

We see one dimensional motion in previous topics.

Projectile motion problems