P L E A S E H E L P When a cloud is charged charged, the charge will flow to the ground and create lightning. what is this called?

Negative charge
Positive charge
Static electricity
Standard electricity

Ais not a compound machine. a. bolt b. shovel c. handcart (dolly) d. see-saw (teeter totter)

Arunner is training for an upcoming marathon by running around a 100-m-diameter circular track at constant speed. let a coordinate system have its origin at the center of the circle with the x-axis pointing east and the y-axis north. the runner starts at (x, y) = (50 m, 0 m) and runs 2.5 times around the track in a clockwise direction.

What is friction? how does it affect the motion of an object?