Explain Energy Transfer Via Fields - Physics

$E_p$ to $E_k$. Falling converts gravitational potential to kinetic energy.

Negative, since $\Delta E_p = mg\Delta h$ and $\Delta h<0$. Downward motion means negative height change, so $\Delta E_p < 0$.

Positive, because force and displacement are in the same direction. Gravity aids downward motion, doing positive work.

$6,\text{J}$. Using $\Delta E = q\Delta V$: $3,\text{C} \times 2,\text{V} = 6,\text{J}$.

$78.4,\text{J}$. Using $\Delta E_p = mg\Delta h$: $2 \times 9.8 \times 4 = 78.4,\text{J}$.

$15,\text{J}$. Using $W = Fd$: $5,\text{N} \times 3,\text{m} = 15,\text{J}$.

$\Delta E = q\Delta V$. Charge times voltage gives energy change in electric fields.

It increases. Work against gravity stores energy as gravitational potential.

Field direction and relative strength (line density). Lines show direction; density indicates field strength.

Energy can be stored in the field (in the field configuration). Fields themselves contain energy, not just the interacting objects.

$\Delta E_p = mg\Delta h$. Near Earth, $E_p$ change depends on mass, gravity, and height change.

$W = \Delta E_k$. Work-energy theorem: work done equals kinetic energy change.

$W = Fd$. Work equals force times displacement when parallel.

The magnetic field. Magnetic fields interact with moving charges and magnetic materials.

Contact forces require touching; field forces act at a distance. Fields enable force transmission through empty space.

The gravitational field. Gravity attracts masses, converting potential to kinetic energy.

The electric field. Electric fields exert forces on charges, enabling energy transfer.

A region where a charge experiences an electric force. Electric fields exist around charges and push/pull other charges.

A region where moving charges or magnets experience a force. Magnetic fields affect only moving charges or magnetic materials.

$W=Fd$ (along the force); energy transferred equals work done. Work is force times displacement in the force's direction.

The force must cause displacement in the direction of the force. No work is done if force is perpendicular to displacement.

$g= frac{F}{m}$. Field strength is force per unit test mass.

$E= frac{F}{q}$. Field strength is force per unit test charge.

$V= frac{ Delta E}{q}$. Voltage is energy transferred per unit charge.

The field’s potential energy store decreases. Energy is conserved: field loses what object gains.

The field’s potential energy store increases. External work adds energy to the field's store.

$ Delta E=qV=36,\text{J}$. Using $\Delta E=qV$: $\Delta E=3\times12=36,\text{J}$.

No; without displacement, the field does no work and transfers no energy. Work requires displacement; no movement means no energy transfer.

Electric potential energy decreases; kinetic energy increases. Electric fields convert potential to kinetic energy for moving charges.