Understanding Horizontal Ridges on Toenails

Physics Uncovered on Instagram: "In every projectile motion, only the vertical velocity of the projectile changes with time due to the vertical effect of gravity, while the horizontal velocity remains constant throughout the whole trajectory. Projectile motion is a form of motion experienced by an object or particle that is projected in a gravitational field, such as from Earth’s surface, and moves along a curved path under the action of gravity only."