Projectile Motion Practice 1

Multiple Choice

A projectile is fired from a cannon at a 30-degree angle with the ground and an initial velocity of 100 m/sec. Assuming no air resistance and g = 10 m/s², calculate the time it will spend in the air.

• 2 seconds

• 5 seconds

• 10 seconds

• 20 seconds

Multiple Choice

What does the graph in the y vs. t plane represent in terms of vertical motion?

• The height of an object over time

• The distance traveled horizontally

• The speed of an object

• The acceleration of an object

Multiple Choice

What is the difference between the projectile's path in the absence of gravity and the path influenced by gravity?

• The path is straight in both cases

• The path is parabolic when gravity is present

• The path is circular when gravity is present

• The path is horizontal in both cases

Open Ended

How does the video clip justify that horizontal motion of a projectile is independent of its vertical motion?

Multiple Choice

What is the slope of the velocity vs. time graph for the projectile motion?

• -5.5 m/s

• 0 m/s²

• -9.8 m/s²

• 5.5 m/s

Multiple Choice

What does the horizontal line in the projectile motion graph represent?

• Constant velocity

• Increasing velocity

• Decreasing velocity

• No motion

Multiple Choice

What are the components of the initial velocity vector for a football kicked at an angle of 30° with an initial velocity of 40 m/s?

• Horizontal component

• Vertical component

• Both components

• Neither component

Multiple Choice

A projectile is launched at 68.0° above the horizontal and at a speed of 55 m/s. What is the maximum height reached by the projectile?

• 233 m

• 158 m

• 2.6 m

• 133 m

Multiple Choice

Victor Velocity is standing on top of the roof of his house, firing stones with his slingshot over a level field. He is aiming straight outward, horizontally. If Victor pulls back harder on the sling to shoot a stone, which of the following quantities will be changed?

• The vertical displacement of the stone.

• The distance the stone travels, and the horizontal velocity.

• The time it takes the stone to strike the ground, and the horizontal velocity.

Multiple Choice

What happens to the range of a projectile when it is launched at a greater angle?

• It increases

• It decreases

• It remains the same

• It becomes unpredictable

Open Ended

How far does Herman travel horizontally before reuniting with the ground?

Multiple Select

What equation(s) can you use to answer the question:

what is the maximum height that the ball reaches?

• $$x_f=x_0+v_0t+\frac{1}{2}at^2$$

• $$x_f=\ x_0\ +\ \frac{1}{2}\left(v_f+v_0\right)t$$

• $$v_f=v_0+at$$

• $$v_f^2=v_0^2+2a\left(x_f-x_0\right)$$

Multiple Choice

A projectile is launched from a height with an initial horizontal velocity of 20 m/s. If the projectile flies for 40 seconds, what is its horizontal velocity just before it hits the ground?

• 20 m/s

• 2 m/s

• 800 m/s

• 0 m/s

Open Ended

What component is being depicted in the following graphs and why?

Multiple Choice

Suppose Lemming A runs off the edge of the cliff at 2 m/s and Lemming B runs off the edge at 1 m/s. Which will hit the ground farther from the base of the cliff?

• A

• B

• Both at the same distance

Multiple Choice

Two objects of the same mass are launched from the ground. Object A has a launch angle of 45, while Object B has a launch angle of 65. Which object will hit the ground first?

• A
• B
• Both objects hit the ground at the same time
• unable to determine with the given information

Multiple Choice

What are the horizontal and vertical components of the initial velocity given the angle of 36 degrees?

• 11.8 m/s and 16.2 m/s

• 20 m/s and 20 m/s

• 39 m/s and 3.3 m/s

• 16.2 m/s and 11.8 m/s

Poll

How confident do you feel about this topic now?

• Very confident
• Somewhat confident
• Not confident