Which of the following statements are true? a. forces do not cause any changes to matter b. forces and motion are not related c. if matter moves, a force acted on it d. matter is held together by forces

In the illustration, which two simple machines are being used to enable the student to reach the door? a. inclined plane and pulley b lever and wheel-and-axle c pulley and lever d wheel-and axle and inclined plane

The gun from the crime scene shows tool marks where the serial numbers are ground off. there are also tool marks on the bullets left behind. what information can the tool marks on the bullets and gun provide about the crime? what type of evidence does this information provide, individual or class?

How does the strength of the electrostatic force between an electron and a proton compare to the strength of the gravitational force between them?