Question

1. make a prediction about what will happen if we cut the string that is holding the mass hanging from the foam board.

1. at this point in time, are the forces on each piece of matter balanced or unbalanced? how can we tell?

1. what happened to the balance of forces and the matter in the time between the previous state and this state?

matter and energy

1. when did we see evidence of energy transferred into or out of the system?

1. how are matter changes related to the energy transfer we observed in this system?

Explanation:

These questions are about forces, motion, and energy transfer, which fall under the subfield of Physics (Natural Science). For question 7, when the string is cut, the tension force holding the mass is removed, so gravity (a downward force) will cause the mass to accelerate downward. For question 8, if the matter is stationary or moving at a constant velocity, forces are balanced (net force = 0); if accelerating, forces are unbalanced. We tell by observing motion (no acceleration means balanced). For question 9, when the string was cut, the force balance changed (tension was removed), so unbalanced forces caused the mass to move (change in matter's state from stationary to moving). For question 10, energy transfer occurs when the string is cut (potential energy of the mass converts to kinetic energy as it falls, or work is done by gravity). For question 11, the matter (mass) changes its motion (falls) due to energy transfer (potential to kinetic) from the unbalanced force (gravity) acting on it.

Answer:

Question 7:

The mass will fall downward because the tension force from the string is removed, and the gravitational force will cause it to accelerate toward the ground.

Question 8:

• If the matter (mass and foam board) is stationary or moving at a constant velocity, the forces are balanced. We can tell because there is no acceleration (change in velocity). If the mass is hanging still, the upward tension force in the string balances the downward gravitational force on the mass, and the foam board is in equilibrium due to its own balanced forces (e.g., normal force, gravity, and tension from the string).
• If the mass is accelerating (e.g., if the string was just cut and it's starting to fall), the forces are unbalanced (the gravitational force is now the net force, causing acceleration).

Question 9:

Before the string was cut, the forces on the mass were balanced (tension upward = gravity downward), and the mass was stationary. After cutting the string, the tension force was removed, so the forces became unbalanced (gravity is now the net force). This unbalanced force caused the mass to accelerate downward (change in the matter's state from stationary to moving). The foam board, which had tension from the string, will also experience a change in forces (the tension force is removed), so its equilibrium may be disrupted (e.g., it could tilt or move if other forces were balancing the tension).

Question 10:

We see evidence of energy transfer when the string is cut. The mass has gravitational potential energy relative to the ground. When the string is cut, this potential energy is converted into kinetic energy as the mass falls (energy transfer from potential to kinetic). Also, work is done by the gravitational force on the mass, transferring energy to it to make it move.

Question 11:

The matter (the mass) changes its motion (falls) due to the energy transfer that occurs when the forces become unbalanced. The gravitational potential energy of the mass is converted into kinetic energy as it moves (falls), and this energy transfer is related to the unbalanced force (gravity) acting on the matter, causing it to accelerate and change its state of motion. The change in the matter's position and velocity is a result of the energy transferred to it from the gravitational force.