4C: Projectiles launched horizontally & Circular Motion

Person runs off a cliff that is 30 m high at 5 m/s. How far from the base of the cliff did the diver land (horizontal displacement)? Work to the 2nd decimal place.

• 30.00 m

• 150.00 m

• 12.35 m

• 6.12 m

The diagram below which shows a ball projected horizontally with an initial velocity of 20. meters per second east, off a cliff 100. meters high. [Neglect air resistance.]

How many seconds does the ball take to reach the ground?

• 2.0 s

• 20.0 s

• 9.8 s

• 4.5 s

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

The diagram below which shows a ball projected horizontally with an initial velocity of 20. meters per second east, off a cliff 100. meters high. [Neglect air resistance.]

During the flight of the ball, what is the direction of its acceleration?

• westward

• downward

• upward

• eastward

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A book is pushed with an initial horizontal velocity of 5.0 meters per second off the top of a desk. What is the initial vertical velocity of the book?

• 2.5 m/s

• 1.0m/s

• 0 m/s

• 5.0 m/s

A stone thrown from the top of a tall building follows a path that is

• circular

• hyperbolic

• parabolic

• made of two straight line segments

A bullet shot horizontally from a gun

• strikes the ground much later than one dropped from the same point at the same instant

• never strikes the ground

• strikes the ground at approximately the same time as one dropped vertically from the same point at the same instant

• strikes the ground much sooner than one dropped vertically form the same point at the same instant

The vertical velocity of a projectile in the air with no air resistance

• never changes

• become a circle

• changes over time

A ball at the end of a string is being swung in a horizontal circle. What is the direction of the acceleration of the ball?

• Tangent to the circle, in the direction of the ball's motion

• Toward the center of the circle

Tags

NGSS.HS-PS2-1

A ball at the end of a string is being swung in a horizontal circle. What is the direction of the net force on the ball?

• Tangent to the circle

• Toward the center of the circle

• There is no net force

Tags

NGSS.HS-PS2-1