Projectile Motion

Consider a ball thrown up from the surface of the earth into the air at an angle of 30⁰ above the horizontal. Air friction is negligible. Just after the ball is released, its acceleration is:

• Upwards at 9.8 m/s2

• Upwards at 4.9 m/s2

• Downwards at 9.8 m/s2

• 0 m/s2

• None of the above

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A rock is thrown into the air at an angle relative to the vertical, and follows the path shown here. Consider air friction to be negligible. What is the direction of the net acceleration of the rock at point D?

• to the left

• to the right

• straight up

• straight down

• there is no net acceleration at point D

Tags

NGSS.HS-PS2-1

A projectile is fired horizontally from a height of 20 m above the ground, with an initial velocity of 7.0 m/s. How far does the projectile travel horizontally before it reaches the ground?

• 7m

• 14m

• 140m

• 3.5m

• 20m

Two balls, identical except for color, are projected horizontally from the roof of a tall building at the same instant. The initial speed of the red ball is twice the initial speed of the blue ball.

Which ball hits the ground first?

• The red ball

• The blue ball

• Both hit the ground at the same time

• The answer cannot be calculated

A large beach ball is dropped from the ceiling of a school gymnasium to the floor about 10 meters below. Which of the following graphs would best represent its velocity as a function of time? (do not neglect air resistance)

• 
• 
• 
• 

Tags

NGSS.HS-PS2-1

In the picture, cannonball A was launched at 10 m/s at 60°, and B was launched at 18 m/s at 25°. The cannonball that hit the ground first was

• A, because it had less total velocity.

• B, because it had more total velocity.

• A, because it had less initial vertical velocity.

• B, because it had less initial vertical velocity.

A projectile is launched with a horizontal velocity of 20 m/s and an initial vertical velocity of 20 m/s. Which graph correctly shows the horizontal position of the projectile over time?

• 
• 
• 
• 

A projectile is launched, and its vertical and horizontal velocities are shown in the graph. What is the magnitude of the projectile's initial velocity?

• 25 m/s

• 10 m/s

• 325 m/s

• 18 m/s

Tags

NGSS.HS-PS2-1