acceleration in free fall

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Following that is not characteristic of air resistance is

Following that is not characteristic of air resistance is
  • A. It always opposes motion
  • B. It decrease with speed of object
  • C. It increases with surface area
  • D. It increases with density of air
  • Correct Answer: Option B

Gravitational force of earth is

Gravitational force of earth is
  • A. None
  • B. None
  • C. None
  • D. None
  • Correct Answer: Option C

If a feather and an iron bar is released from a same height in a room without any air resistance. first one to fall is

If a feather and an iron bar is released from a same height in a room without any air resistance. first one to fall is
  • A. Iron bar
  • B. Feather
  • C. Both at same time
  • D. They won
  • Correct Answer: Option C

Air resistance is a

Air resistance is a
  • A. frictional force
  • B. gravitational force
  • C. backward force
  • D. balanced force
  • Correct Answer: Option A

One of characteristics of air resistance is

One of characteristics of air resistance is
  • A. It does not oppose motion
  • B. It decreases with speed of object
  • C. It decreases with surface area
  • D. It increases with density of air
  • Correct Answer: Option D