9781118230725.pdf

4-4 PROJECTILE MOTION 71

A

x

y

O

θ 0

v 0

v 0 y

v 0 x

y

O

x

O

vx

vy v

x

y

y

O

vy= 0

v

x

y

O

vx

vy v

x

y

O

vx

x

O v 0 x

x

O vx

x

O

vx

x

O

vx

x

O

vx

y

O

v 0 y

O

vy

y

y

O

vy= 0

y

O

vy

y

vx

vy θ

v

vx

vy

Vertical motion

Vertical velocity

Launch Launch

Speed decreasing

Constant velocity

Speed increasing

Constant velocity

Constant velocity

Stopped at

maximum

height

Constant velocity

• Horizontal motion ➡ Projectile motion

Launch velocity

Launch angle

This vertical motion plus

this horizontal motion

produces this projectile motion.

Figure 4-9The projectile motionof an object launched into the air at the origin of a coordinate system and with launch

velocity at angle u 0. The motion is a combination of vertical motion (constant acceleration) and horizontal motion

(constant velocity), as shown by the velocity components.

:v 0