Which of the following statements is true? A. Friction works in the direction opposite of motion.
B. Air resistance is greatest for objects with small surface areas.
C. Only large masses exert gravitational force.
D. Lubrication can be used to increase friction.

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?

When you jump from an elevated position you usually bend your knees upon reaching the ground. by doing this, you make the time of the impact about 10 times as great as for a stiff-legged landing. in this way the average force your body experiences is a) less than 1/10 as great. b) more than 1/10 as great. c) about 1/10 as great. d) about 10 times as great.

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion