Projectile Review

1.  Make a chart showing the vertical and horizontal velocity of the projectile from t = 0 to t = 6 sec.

Vx (m/s) Vy (m/s) 10 30

V_ix = 10 m/s  V_iy = 30 m/s

    1a)  How does gravity change a projectiles vertical motion on the way up to the peak. Projectile Animation

    1b) A projectiles vertical velocity at the peak is always __________. Projectile Animation


    1c) How does gravity effect the vertical velocity of a projectile after an object passes the peak? Projectile Animation

    1d) What is the vertical acceleration of this ball? Vx/Vy Projectile Animation

    1e) What is the horizontal acceleration? Vx/Vy Projectile Animation

2.  A projectile takes 2 seconds to reach the peak of its parabolic path, what is the total time it spends in the air? Vx/Vy Projectile Animation

3. How should you aim at a target when you know it's going to fall when you shoot? Cyclops Animation

4. If an object is projected horizontally at 1000 m/s, what is Viy and Vix? (no trig is needed for this one)

        V_iy = ________ V_ix = ___________

Horizontal and Vertical Velocity Components

5.  What is the vertical component of a soccer ball's velocity if it is kicked at a speed of 10 m/s and an angle of 60 degrees? (see equation sheet - trig.)

6. What is the horizontal component?    (see equation sheet)
 

7. An object is dropped off a cliff and at the same time a second ball is projected horizontally at 10 m/s.

Compare the following for each object: Projectile fired horizontally & dropped

a) time spent in air just before hitting the ground

b) vertical height of both objects (show this in your drawing)

c) horizontal displacement (d_x)

d) vertical acceleration

8. In the previous question, what is the horizontal velocity of the second ball when it hits the ground.

9. A 10 kg object an a 100 kg object are dropped simultaneously from the same height. Compare each object's:

    a) height at any point in time _________________
 

    b) time each spends in the air ________________

    c) vertical velocity at any point in time _________________
 

    d) vertical acceleration at any point in time_________________