I have two questions?
1-What do we call the quantity force x distance, and what quantity does it change?
**The quantity is called work and it changes energy**
2-In what unit is energy measured?
**joule?? isn't it the same as work?**
yes, yes.
1- The quantity force x distance is called work. It represents the amount of energy transferred when a force is applied over a certain distance. The work done on an object can change its energy. If work is done on an object, it can increase its energy. If work is done by an object, it can decrease its energy.
To calculate work, you multiply the force applied to an object by the distance it moves in the direction of the force. The equation for work is: Work = Force x Distance x cos(theta), where theta is the angle between the force and the direction of motion. If the force is applied in the same direction as the motion, the angle is 0 degrees and the cosine of 0 degrees is 1.
2- Energy can be measured in different units depending on the system of measurement you are using. In the International System of Units (SI), energy is measured in joules (J). One joule is defined as the amount of energy transferred when a force of one newton is applied through a distance of one meter in the direction of the force.
Yes, you are correct! Work and energy are measured in the same unit, which is the joule. This is because work done on an object changes its energy, so the unit for both quantities is the same.