![]() When you slam on the brakes, the velocity of the car goes to 0, but your body continues in its state of motion. The inertia of an object is just the tendency for some object to “keep doing what it’s doing.” A ball traveling 4m/s to the left will remain traveling 4 m/s to the left, a block that is at rest at 0 m/s will remain at rest at 0 m/s.Īs you are driving your car, your body is moving at the same velocity as your car. The concept of inertia can be summarized by Newton’s first law of motion which states that an object at rest tends to stay at rest and an object in motion tends to stay in motion. Inertia is simply the tendency for a body to continue in a state of constant motion. Why does this happen? The answer is simple: inertia. ![]() As the car slows down, your body wants to continue to move and you lurch forward. A cat walks in front of you and you rapidly push the brakes. ![]() We will take a look at each of these components. The characteristic motion of projectiles can be explained by two things: inertia and gravity. Vertical distance = (initial vertical velocity)(time)−(½)(acceleration from gravity)(time) 2 Horizontal distance = (horizontal velocity) (time) Vertical velocity = (initial vertical velocity)−(acceleration)(time) Horizontal velocity = initial horizontal velocity The main equations of motion for a projectile with respect to time t are: Things like cannonballs, bullets, baseballs, and trebuchets are all subject to projectile motion. A projectile is a moving object that is solely under the influence of gravity. Why does the ball move the way it does? Why does it climb up an arc to some highest point and then fall back towards the ground? Why does its ascending motion slow down, and its descending motion speed up? In our example, the baseball is a projectile. What happens if you throw the ball at a 45-degree angle up from eye level? You will see the ball trace out an arc in the sky, slowing down before ascending to a highest point in its path, then falling back to the ground. The further the ball falls down, the faster it falls. The ball begins to slow its upward ascent before reaching the highest point of its movement after which it reverses direction and falls back towards the ground. What happens? As you initially throw the baseball, it will gains some height.
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