Presentation on theme: "Projectile motion Vectors and scalars A scalar quantity is described only by its magnitude Examples – 5.0kg; 10.0 l; 50.0 o C; 10.0m/s."— Presentation transcript:
Projectile motion Vectors and scalars A scalar quantity is described only by its magnitude Examples – 5.0kg; 10.0 l; 50.0 o C; 10.0m/s
Projectile motion Vectors and scalars A vector quantity is described by its magnitude and by its direction. Examples – 10.0 m/s north; 10.0m/s 2 down; 5.0N up.
Projectile motion Vectors and scalars Vector quantities are represented by arrows. The length of the arrow is proportional to the magnitude of the vector quantity. The head of the arrow points in the direction of the vector. The other end of the arrow is the tail of the vector.
A velocity vector resolved into components – page 32
Projectile motion A projectile is an object moving only under the influence of gravity. We also say that the object is in free fall. We can separate the horizontal and vertical components of a projectile’s velocity by using vectors.
Projectile motion The horizontal component of a projectile’s velocity does not change. It is constant.
Projectile motion The vertical component of a projectile’s velocity is always changing because it always accelerating downward.
Projectile motion The two motions can be treated independently.
Satellites are projectiles that move so fast, that the Earth curves away from them at the same rate that they are falling toward the earth. This can only happen beyond the atmosphere where an object moving at those speeds will not burn up fron air friction.