Horizontally Launched Projectiles

If a ball thrown straight up into the air takes 4 seconds to reach the top (peak), how long will it take to travel from the peak back to the original position?

• 0s

• 1s

• 3s

• 4s

A ball thrown straight up takes 8 total seconds to complete its journey all the way up and down. 1 second into its journey and 7 seconds into its journey the magnitude of its velocity will be ______________ and its direction _______________.

• opposite, the same

• the same, opposite

• the same, the same

• opposite, opposite

The fact that an apple and a watermelon, dropped simultaneously from the same height, would hit the ground at the same time indicates that

• you don't like apples or watermelons.

• greater masses have greater acceleration.

• lesser masses have greater acceleration.

• acceleration is independent of mass.

Tags

NGSS.HS-PS2-1

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

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Which hits the ground first if they start at the same height: a dropped ball or a ball launched with a

horizontal velocity?

• the launched ball

• the dropped ball

• they both hit at the same time

The initial horizontal velocity of a projectile is ____ its final horizontal velocity.

• less than

• equal to

• greater than

What is true about the vertical velocity of a projectile launched horizontally?

• It is initially at its maximum value.

• It increases due to gravity as it falls.

• It remains constant throughout its trajectory.

• It decreases as it falls due to gravity.

What is the vertical velocity of an object launched straight up at its highest point?

• zero

• equal to its v_x

• ½ its maximum value

• equal to gravity

The path followed by a projectile is also known as its

• trajectory

• range

• height

• vertical displacement

Once a projectile is launched, what is the only force that affects its motion?

• mass

• friction

• inertia

• gravity