Projectiles Launched at an Angle
you can see the velocity at certain points. If you throw side arm the football won't at a high angle, but if you throw straight it will go farther and at a higher angle. Objects that are thrown or launched into the air and are subject to gravity are called projectiles. An object thrown vertically upward is a projectile, and upward at an angle horizontally is also a projectile. The movement of the ball in the vertical direction is influenced by the force of gravity. The movement of the ball in the vertical direction is influenced by the force of gravity. As the ball travels up, gravity slows it down briefly at its peak height. The ball then comes down and gravity accelerates it until it hits the ground. The path of any object that is launched or thrown and is called projectile motion. When the ball leaves the punters foot, it is moving with a given velocity depending upon the force with which he kicks the ball. The ball moves in two directions, horizontally and vertically, because the ball was launched at an angle.
Review Questions
1.)A ball thrown upward is caught when it comes back down. In the absences of air resistance, the velocity of the ball when caught is
a. greater than the velocity it had when thrown upwards
b. the same as the velocity it had when thrown upwards
c. the same magnitude as, and opposite in sign to the velocity it had when thrown upwards
d. zero
2) when the ball reaches its highest point, the magnitude of its acceleration is
a. 0 m/s^2
b. about 5 m/s^2
c. about 10 m/s^2
d. about 20 m/s^s
a. greater than the velocity it had when thrown upwards
b. the same as the velocity it had when thrown upwards
c. the same magnitude as, and opposite in sign to the velocity it had when thrown upwards
d. zero
2) when the ball reaches its highest point, the magnitude of its acceleration is
a. 0 m/s^2
b. about 5 m/s^2
c. about 10 m/s^2
d. about 20 m/s^s