Unit 6 Review Worksheet (Horizontal Projectiles)
For all questions on this test assume air resistance and friction to be negligible forces unless otherwise specified. This means that their effects can be ignored.
1.Starting from rest, a freely-falling bowling ball will fall how far in 3 seconds? Show your work or explain your reasoning.
2. A bowling ball is dropped from rest. What is the ball’s velocity after falling for 4 seconds? Show your work or explain your reasoning.
Questions 3 - 5 refer to the situation and diagram described below.
Bullet A is dropped at the same time bullet B is fired from a gun. Bullet A has an initial velocity of 0 m/s and bullet B has an initial horizontal velocity of 100m/s. The barrel of the gun is 1m off of the ground.
3. If bullet A is dropped at the same time bullet B leaves the barrel of the gun at what time does bullet A hit the ground?
a.at some time before bullet B.
b.at some time after bullet B.
c.at the same time as bullet B.
d.There is not enough information to decide.
4. Find the amount of time the bullet, fired from the gun, is in the air until it hits the ground. Hint: use the vertical part of the bullets motion to find the time of free-fall. Show work or explain your reasoning.
5. How far does fired bullet travel horizontally before it hits the ground? Show work or explain your reasoning.
Questions 6, 7, and 8 refer to the diagram and situation described below:
Two individuals jump off of the side of a cliff with the same initial horizontal velocity at the same time. Person A jumps off at a height 10m above the water and person B jumps of at a height of 6m above the water. Their initial horizontal velocity is 8.2m/s.
6. If both people leave the edge of the cliff at the same instant, person A will land
a. At some time before person B.
b. At some time after person B.
c. At the same time as person B.
d. There is not enough information to decide.
7. Explain the reasoning behind your answer for question number 6 about the times of free fall for each person.
8. Which person lands farther away from the edge of the cliff horizontally? Explain your reasoning.
9. A car jumps a river that is 6m wide and lands on the right side 2m lower than the left side?
aHow much time is the car in the air? Hint: how much time did it take to drop down 2m?
bHow fast horizontally must the car have been traveling to clear the river?
Questions 10 & 11 refer to the following scenario. Two guns are fired horizontally from the same height. Gun A can fire a bullet at 400m/s and gun B can fire a bullet at 600m/s.
10. Which bullet will hit the ground first? Or will they hit the ground at the same time? Assume bullets are fired from the same height.Explain your reasoning.
11. Which bullet will travel farther horizontally before it hits the ground? Or, will they travel the same horizontal distance? Explain your reasoning.
12. Suppose a mountain biker moves at a constant velocity of 6 m/s across the flat top of a cliff. The biker leaves the edge of the cliff and strikes the ground below 2s later.
a.How high was the cliff? Hint: find the biker’s vertical displacement. Show work or explain your reasoning to receive full credit.
b.How far, horizontally, from the edge of the cliff does the biker hit the ground? Show work or explain your reasoning to receive full credit.