Free Fallin'

If a ball is thrown straight up with a velocity of 10 m/s, how long will it take to return to its starting point? (Ignore air resistance)

• 1 second

• 2 seconds

• 10 seconds

• 20 seconds

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

What happens to the vertical velocity of a projectile as it goes up?

• increases

• decreases

• stays the same

• none of these

What happens to the vertical velocity of a projectile as it goes down?

• increases

• decreases

• stays the same

• none of these

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A freely-falling watermelon falls with constant

• acceleration

• speed

• velocity

• distances each successive second

Tags

NGSS.HS-PS2-1

When a tossed object reaches maximum height the acceleration is

• 10 (m/s)/s down

• 10 (m/s)/s up

• 0 m/s

Tags

NGSS.HS-PS2-1

What is the only force acting on an object that is free-falling?

• force of gravity

• zero

• the air resistance acting on the object

• 10 N

What is the unit for acceleration?

• kg

• m/s

• N

• m/s/s

Tags

NGSS.HS-PS2-1

A dropped object in true free fall on earth will reach a velocity of -10 m/s

• after falling for 1 second

• never

• is constantly falling at this rate

• after falling for 9.8 seconds

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

If an object has fallen for 2 seconds on earth from rest without air resistance, what is its speed?

• 20 m/s

• 15 m/s

• 10 m/s

• 0 m/s

Tags

NGSS.HS-PS2-1