FreeFall

Which would hit the ground first if dropped from the same height in a vacuum—a feather or a metal bolt?

• the feather

• the metal bolt

• They would hit the ground at the same time.

• They would be suspended in a vacuum.

Tags

NGSS.HS-PS2-4

If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by

• its rate depends on its initial speed

• about 15 m/s

• about 10 m/s

• about 5 m/s

Tags

NGSS.HS-PS2-1

Which object would fall with greater acceleration in a vacuum - leaf or pebble?

• The leaf

• The pebble

• Difficult to determine without more information

• Both accelerate at the same rate

Tags

NGSS.HS-PS2-1

While an object is travelling upwards it's acceleration is

• upwards
• downwards

Tags

NGSS.HS-PS2-1

While an object is travelling downwards, it's acceleration is

• upwards
• downwards

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

What is the value of acceleration in Earth's gravity field?

• 9.80 m/s²
• 1.62 m/s²
• 3.70 m/s²
• 24.9 m/s²

Tags

NGSS.HS-PS2-4

A free falling object is moving downwards at 27 m/s. If it continues to fall, 1 second later the object would be moving with downward speed of approximately

• 270 m/s

• 37 m/s

• 27 m/s

• 17 m/s

Tags

NGSS.HS-PS2-1

If air resistance is negligible, which object will hit the ground first if dropped at the same time: Bowling ball or Feather?

• bowling ball

• Feather

• Both with hit the ground at the same time

• They will not fall without air resistance

An airplane flies east at 400 km/hr. In which direction is the air resistance force acting upon the airplane?

• East

• West

• Up

• Down

Tags

NGSS.MS-PS2-2

Look at the pictures of the cars. Which car will have the most air resistance force acting upon it? They will be moving at the same speed.

• 
• 
• 
• All will have equal air resistance force.