Question

1. which of the following descriptions of moving objects accurately portray a projectile? list all that apply. 1. an object which is moving through the air and not touching any surface 2. a falling skydiver with an open parachute 3. any object upon which air resistance is negligible 4. a free - falling object 5. an object upon which the only significant force is the force of gravity 6. a falling feather 7. a falling feather in a vacuum chamber 8. a falling feather in a falling vacuum chamber.

Explanation:

A projectile is an object upon which the only significant force acting is gravity. An object moving through the air not touching any surface and with air - resistance negligible can be considered a projectile. A free - falling object has gravity as the main force. In a vacuum, there is no air resistance, so a falling object in a vacuum (like a falling feather in a vacuum chamber or a falling feather in a falling vacuum chamber) is also a projectile. A falling skydiver with an open parachute has significant air resistance from the parachute, so it's not a projectile.

Answer:

1. an object which is moving through the air and not touching any surface
2. any object upon which air resistance is negligible
3. a free - falling object
4. an object upon which the only significant force is the force of gravity
5. a falling feather in a vacuum chamber
6. a falling feather in a falling vacuum chamber