Question

directions: label each arrow with push, pull, friction, gravity, compression, or tension. identify if the force is balanced or unbalanced and which direction it will move.
7.
8.
9.
10.
12.

1. as the skydiver falls, the friction (air resistance) becomes equal to the downward pull of gravity. when these two forces become equal in magnitude, what will happen to the skydiver?

Explanation:

Step1: Analyze Problem 7

For the ant: Left force $F_L = 2\,\text{N}$ (friction), Right force $F_R = 8\,\text{N}$ (pull). Net force: $F_{net} = 8 - 2 = 6\,\text{N}$ right.

Step2: Analyze Problem 8

For the dog/person: Left force $F_L = 15\,\text{N}$ (pull), Right force $F_R = 10\,\text{N}$ (pull). Net force: $F_{net} = 15 - 10 = 5\,\text{N}$ left.

Step3: Analyze Problem 9

For the piano: Right force $F_R = 30\,\text{N}$ (push), Left forces $F_L = 8 + 12 + 15 = 35\,\text{N}$ (pull/friction). Net force: $F_{net} = 35 - 30 = 5\,\text{N}$ left.

Step4: Analyze Problem 10

For the rope pullers: Left force $F_L = 15\,\text{N}$ (pull), Right force $F_R = 15\,\text{N}$ (pull). Net force: $F_{net} = 15 - 15 = 0\,\text{N}$.

Step5: Analyze Problem 11 (spring)

For the mass: Upward force $F_U = 30\,\text{N}$ (tension), Downward force $F_D = 30\,\text{N}$ (gravity). Net force: $F_{net} = 30 - 30 = 0\,\text{N}$.

Step6: Analyze Problem 12 (skydiver)

For the skydiver: Upward force $F_U = 50\,\text{N}$ (air resistance), Downward force $F_D = 150\,\text{N}$ (gravity). Net force: $F_{net} = 150 - 50 = 100\,\text{N}$ down.

Step7: Answer Problem 13

When air resistance = gravity, net force is 0, so acceleration stops.

Answer:

1. Unbalanced forces; moves right (net force = 6N right)
2. Unbalanced forces; moves left (net force = 5N left)
3. Unbalanced forces; moves left (net force = 5N left)
4. Balanced forces; no movement (net force = 0N)
5. Balanced forces; no movement (net force = 0N)
6. Unbalanced forces; moves down (net force = 100N down)
7. The skydiver will stop accelerating and fall at a constant terminal velocity.