Yitzach said:
bradefeld said:
To calculate the kinetic energy (KE) of a 10kg block, you need to know its mass and velocity. The formula for calculating KE is KE = 1/2 * mass * velocity^2. So for a 10kg block moving at a velocity of 5 m/s, the KE would be: KE = 1/2 * 10kg * (5m/s)^2 = 125 joules.
The formula for calculating potential energy (PE) is PE = mass * gravity * height. In this scenario, the mass and height refer to the block and the gravity is the acceleration due to gravity, which is approximately 9.8 m/s^2 on Earth. So for a 10kg block sitting 2 meters above the ground, the PE would be: PE = 10kg * 9.8 m/s^2 * 2m = 196 joules.
The total energy (TE) of a 10kg block is simply the sum of its kinetic and potential energy. So if the block has a KE of 125 joules and a PE of 196 joules, the TE would be: TE = KE + PE = 125 joules + 196 joules = 321 joules.
Friction can decrease the amount of kinetic energy and potential energy in a system, as some of the energy is converted into heat. To account for friction, you would need to use the formula: work = force * distance, to calculate the work done by friction. This work value can then be subtracted from the KE and PE calculations to get a more accurate value.
No, the total energy of a system cannot be negative. Energy is always conserved, meaning it cannot be created or destroyed, only transferred or converted. So even if the block loses some energy due to friction, the total energy will always be greater than or equal to 0.