Question

A bird glides with constant velocity.

Which claim about the forces acting on the bird must be true?
Choose 1 answer:
Choose 1 answer:

(Choice A)
A
There is no net force on the bird.

(Choice B)
B
There are no forces on the bird.

(Choice C)
C
There is not enough information.

(Choice D)
D
There is a net force on the bird.

Answer 1

there is no net force on the bird.

Step-by-step explanation:

Answer 2

"There is no net force on the bird" is true about the force acting on the bird.

Explanation:

For a body with constant velocity, the net force is always equal to zero.

When a body moves in constant velocity, the forces acting on the body is its weight in downward direction and the air drag in the upward direction. Each cancels each other so the body doesn’t move vertically upwards or vertically downwards.

This phenomenon helps the bird to glide through the air with constant velocity. The frictional force is cancelled by the motion opposite to it.