Net force and acceleration as a result of a parachute

In summary, for question 8, the parachute causes both Al and Betty to have the same net force, as explained by the equation F=ma. For question 9, Al should experience more air resistance than Betty due to his greater mass, which can be shown through a free body diagram of the individual forces acting on Al and Betty.
  • #1
ardour

Homework Statement


upload_2017-10-3_17-47-50.png

Homework Equations


F= ma

The Attempt at a Solution


For 8, I think the parachute causes Al and Betty to stop accelerating, so they both have the same net force. (Answer A)

F= ma
F=m*0=0
F=3m*0=0

For 9, I feel like Al should experience more air resistance than Betty to make up for his greater mass, but
I'm not sure what equation would be used to calculate this.
 
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  • #2
Welcome to PF!

Good answer for 8.

For 9, your intuition is good. For a more carefully reasoned argument, consider the individual forces acting on Al alone. It's a good idea do draw a diagram showing the forces acting on an object (a "free body diagram"). What can you say about these forces? Do the same for Betty.
 

1. How does a parachute affect the net force on an object?

When a parachute is deployed, it increases the surface area of the object it is attached to. This results in an increase in air resistance, also known as drag. The drag force counteracts the force of gravity, reducing the net force on the object. This ultimately leads to a decrease in the object's acceleration.

2. What is the relationship between net force and acceleration when a parachute is used?

According to Newton's Second Law of Motion, the net force on an object is directly proportional to its acceleration. This means that as the net force decreases due to the deployment of a parachute, the acceleration of the object also decreases.

3. Does the weight of the object have any impact on the net force and acceleration when a parachute is used?

Yes, the weight of the object plays a significant role in determining the net force and acceleration when a parachute is used. The heavier the object, the greater the force of gravity acting on it, and the more significant the impact of the parachute in reducing the net force and acceleration.

4. How does the shape and size of a parachute affect the net force and acceleration of an object?

The shape and size of a parachute affect the net force and acceleration by altering the amount of air resistance or drag it creates. A larger parachute with a wider surface area will create more drag, resulting in a greater reduction of the net force and acceleration of the object.

5. Can a parachute completely eliminate the net force and acceleration of an object?

No, a parachute cannot completely eliminate the net force and acceleration of an object. It can only reduce them by increasing the air resistance or drag acting on the object. The object will still experience some acceleration due to the force of gravity, but it will be significantly reduced with the deployment of a parachute.

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