Projectile Motion

As an object travels through the air, its vertical velocity 

• changes continuously
• remains the same

What is the horizontal acceleration of a projectile? (neglect air resistance)  

• 0 m/s²
• 9.8 m/s²

What is the vertical acceleration of a projectile? (neglect air resistance) 

• 0 m/s²
• 9.8 m/s² down
• 9.8 m/s² up

If you throw a baseball straight up, what is its velocity at the highest point?

• - 9.8 m/s²
• + 9.8 m/s²
• 0 m/s

If you throw a baseball straight up, what is its acceleration at the highest point?

• - 9.8 m/s²
• + 9.8 m/s²
• 0 m/s²

At the top of a projectile's path above Earth, the vertical acceleration of an object is

• is zero
• goes from positive to negative
• goes from negative to positive
• remains unchanged

If you shoot a gun and at the same time drop a bullet which will hit the ground first? Why?

• The bullet that is shot, because it is going faster
• The dropped bullet, because gravity pulls on it.
• At the same time, because the x and y components are independent of each other. 
• This cannot happen

If you drop a banana, how fast is it going after 2 seconds?

• 4.9m/s
• 9.8m/s
• 19.6m/s
• 29.4m/s

Tags

NGSS.HS-PS2-1

The more mass an object has, the faster it will fall.

• True
• False

A bullet fired horizontally over level ground hits the ground in 0.5 second. If it had been fired with twice the speed it would have hit the ground in

• less than 0.5 s.
• 0.5 s.
• more than 0.5 s.