PROJECTILE MOTION Thrown objects do not travel in a straight line. They tend to curve downward. Anything that is thrown or shot through the air is a.

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Presentation transcript:

PROJECTILE MOTION Thrown objects do not travel in a straight line. They tend to curve downward. Anything that is thrown or shot through the air is a projectile. Because of the Earth’s gravitational pull and the object’s own inertia, projectiles follow a curved path.

PROJECTILE MOTION Projectiles follow a curved path because of the Earth’s gravitational pull. They have two types of motion that are independent of each other: 1. Horizontal motion 2. Vertical motion

PROJECTILE MOTION Mythbusters Which will hit the ground first? A ball that is dropped straight down or a ball that is “shot” out horizontally? * An object launched horizontally will land on the ground at the same time as an object simply dropped from the same height! Mythbusters

CIRCULAR MOTION An object moving in a circular motion at the same speed is accelerating toward the center because its direction is constantly changing. Centripetal acceleration is acceleration toward the center of a curved path. 'Centripetal' comes from the Latin word for 'center seeking‘.

Only centripetal is the real force. CIRCULAR MOTION The direction of the velocity vector at every instant is in the direction tangent to the circle. A TANGENT is a straight line or plane that touches a curve or curved surface at a point, but if extended does not cross it at that point. Centrifugal 'force' is really a function of the inertia of the object being pushed into a circle. It is not really a force at all, it is simply the tendency of an object to go in a straight line. Only centripetal is the real force.

CIRCULAR MOTION Anything that moves in a circle is doing so because a centripetal force is accelerating it toward the center.

CIRCULAR MOTION Centripetal force is the force that causes a moving object to move in a curved path. Without a centripetal force, an object in motion continues along a straight-line path. With a centripetal force, an object in motion will be accelerated and change its direction.