projectile motion

Question 1

trajectory

Answer 1

the flight path of a projectile

Question 1

projectile

Answer 1

a body in free fall that is subject only to the force of gravity and air resistance (airplane is not a projectile)
-humans in flight are projectiles

Question 2

in dealing with projectiles, concerned with 3 main things

Answer 2

range, height, time (gymnastics figure skating)

Question 3

gravity

Answer 3

9.81 m/s^2
-only affects the vertical component of the projectile
-trajectory is parabolic

Question 4

air resistance

Answer 4

usually disregarded
-only affects the horizontal component of the projectile motion
-shortens parabola

Question 5

3 factors that influence the trajectory of a projectile

Answer 5

angle of projection
projection speed
relative height of projection

Question 6

Angle of Projection

Answer 6

Vertical Trajectory= 90 to the horizontal
(projectile follows the same path up and down; vball block)
oblique angle=between 0 and 90=parabolic trajectory
(left and right halves are mirror images)
Horizontal trajectory=negative angle
(peak is at the point of release. object is thrown below horizontal, ball bouncing)

Question 7

optimum projection angle

Answer 7

45 degree is optimum for range
90 degrees is optimum for height

Question 8

projection speed

Answer 8

determines height and horizontal length of trajectory
-most important factor affecting the range of projectile

Question 9

relative height of projection

Answer 9

relative height of projection is the difference between the projection and the landing height
-0 if projection height=landing height (volleyball, soccer ball kicked)
+ if the projection height is higher than the landing height (diving, high hunter, ski jump)
- if projection height is lower than the landing height (basketball, box jump, extra point)