Unit 6 Review – Projectile Motion
1. What assumption must be made before we can do Projectile Motion calculations at this level?
2. A bottle rocket is fired straight up at 9m/s
(a) Explain why it slows as it rises
(b) What is its velocity (in the vertical direction) at the top of its path?
(c) What is the acceleration at the top of its path?
(d) Explain why it increases it velocity as it falls
(e) Theoretically, what is its velocity when it hits the ground?
(f) The next rocket is fired at 60o, what type of motion does it perform? What is the shape of this motion?
(g) Explain why the horizontal velocity is constant during the flight
3. A car is driven off a 22m cliff into the sea at 22m/s
(a) How long did the occupants have to wait before they hit the sea after they leave the cliff?
(b) How far away from the base of the cliff did the car go?
4. An artillery gun is being tested for effective range; it fires a 1.5kg shell at 120m/s. Find the following: time of flight, horizontal range, max height, when the gun angle is: a) 20 degrees, b) 45 degrees, c) 80degrees.
5. A cat is launched with an initial velocity of 66.7m/s at a 62○ angle from ground level to land, on all four paws, on the top of a 150m tall cliff.
(a) How long does it take to safely land?
(b) What is the maximum height of the cat?
6. Another cat is launched with an initial velocity of 30m/s at a 35○ angle from the top of a cliff to land in a pile of pillows 100m below.
(a) How long does it take to safely land?
(b) What is the maximum height of the cat?
7. A daredevil tries to jump a canyon of width 10 m. To do so, he drives his motorcycle up an incline sloped at an angle of 15 degrees. What minimum speed is necessary to clear the canyon?
Two spheres, A and B, are projected off the edge of a bench. Sphere A has twice the horizontal velocity and twice the mass of sphere B.
8. If both spheres leave the edge of the table at the same instant, sphere A
will land______(time)
9. If both spheres leave the edge of the table at the same instant, sphere A hits the
floor at the spot marked X. Sphere B will land ______
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Two spheres A and B, where A has twice the mass of B, are projected at the same horizontal velocity off the edge of two different height shelves. Sphere A leaves from a height of 2.0 m. Sphere B leaves a shelf 1.0 m off the floor.
5.
10. If both spheres leave the edge of the table at the same instant, sphere A will land ______(time)
11. If both spheres leave the edge of the table at the same instant, sphere A hits the floor at the spot marked X. Sphere B will hit the
floor ______