Projectile Motion

Four identical projectiles are launched with the same initial speed, v, but at various angles above the level ground. Which diagram represents the initial velocity of the projectile that will have the largest total horizontal displacement?

• (1)

• (2)

• (3)

• (4)

A projectile is launched into the air with an initial speed of vi at a launch angle of 30° above the horizontal. The projectile lands on the ground 2.0 seconds later.

How does the maximum altitude of the projectile change as the launch angle is increased from 30° to 45° above the horizontal?

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A projectile is launched into the air with an initial speed of vi at a launch angle of 30° above the horizontal. The projectile lands on the ground 2.0 seconds later.

How does the total horizontal distance traveled by the projectile change as the launch angle is increased from 30° to 45° above the horizontal?

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A golf ball is hit at an angle of 45° above the horizontal. What is the acceleration of the golf ball at the highest point in its trajectory? [Neglect friction.]

• 9.8 m/s² upward

• 9.8 m/s² downward

• 6.7 m/s² upward

• 0.0 m/s²

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A golf ball is hit with an initial velocity of 15 meters per second at an angle of 35° above the horizontal. What is the vertical component of the golf ball’s initial velocity?

• 8.6 m/s

• 9.8 m/s

• 12 m/s

• 15 m/s

When the lever is released, the support rod withdraws from ball B, allowing it to fall. At the same instant, the rod contacts ball A, propelling it horizontally to the left. Which statement describes the motion that is observed after the lever is released and the balls fall? [Neglect friction.]

• Ball A travels at constant velocity.

• Ball A hits the tabletop at the same time as ball B.

• Ball B hits the tabletop before ball A.

• Ball B travels with an increasing acceleration.

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A projectile launched at an angle of 45° above the horizontal travels through the air. Compared to the projectile’s theoretical path with no air friction, the actual trajectory of the projectile with air friction is

• lower and shorter

• lower and longer

• higher and shorter

• . higher and longer

What happens to the object’s acceleration as it travels from A to B?

• It increases

• It decreases

• It remains the same

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NGSS.HS-PS2-1

A golf ball is propelled with an initial velocity of 60 meters per second at 37° above the horizontal. The horizontal component of the golf ball’s initial velocity is

• 30 m/s

• 36 m/s

• 40 m/s

• 48 m/s

The path followed by a projectile is also known as its

• trajectory

• range

• height

• vertical displacement

Answer explanation

The path followed by a projectile is called its trajectory.