After walking on carpet, a student reached for a metal doorknob and received an electrical shock. What caused the shock?

While goofing off at the ice skating rink, a student takes off her shoes and places each of them on the ice. her friend, a hockey player, then shoots a hockey puck at each shoe. the first puck immediately comes to rest after it collides with the left shoe. the second puck rebounds after it collides with the right shoe. if each hockey puck has the same incoming speed, which shoe has greater speed after the collision? the right shoe. both shoes have the same speed. the left shoe.

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

How does an observation about an object differ from an inference about that object