A model rock is shot into the air. Once it starts to fall a parachute is deployed. Draw a free body diagram of the rocket with the parachute deployed
ok well there is gravity
does the parachute exert a force upward? onto what? what do i call this force?
Force down is mg where m is the mass and g is the acceleration due to gravity
Force up is Air resistance
A free body diagram of the rocket with parachute attached will have an air resistance force upwards (when falling) and a weight force (m g) downwards. There will be a lesser air resistance force on the rocket than on the psrachute.
To draw a free body diagram of the rocket with the parachute deployed, we need to consider the forces acting on the rocket. Here are the forces and their corresponding labels:
1. Gravity (downward force): This force is always present and acts towards the center of the Earth. Label it as "mg" (mass of the rocket × acceleration due to gravity).
2. Air resistance (opposite to velocity): When the parachute is deployed, it creates air resistance, which opposes the velocity of the rocket. Label it as "Fₐ" (air resistance force).
3. Tension in the parachute strings (upward force): The parachute exerts a force upward which counteracts the gravity. Label it as "T" (tension).
4. Friction (negligible): If there is negligible friction acting on the rocket, it doesn't need to be included in the diagram.
Now, you can draw the free body diagram with the rocket in the center and arrows representing these forces acting on it. The gravity arrow should be pointing downward, the air resistance arrow should point opposite to the velocity, and the tension arrow should point upward.
Remember, free body diagrams are visual representations of the forces acting on an object and can assist in understanding the dynamics of the system.