What is static and sliding friction

Which pair of atoms forms ionic bonds? O metal and metal O metal and nonmetal O nonmetal and nonmetal O nonmetal and noble gas

What causes the displays of lights called auroras?

Why can't plants and animals use the nitrogen directly from the atmosphere? A:There is not enough of it in the air. B:Nitrogen gas contains the element in an inert, unusable state. C:They do use it directly from the atmosphere.

A spot of paint on a bicycle tire moves in a circular path of radius 0.33 m. When the spot has traveled a linear distance of 1.76m, through what angle has the tire rotated?

Which is greater, the gravitational force between earth and the moon, or the force between earth and the sun?

Why do the densities of most substances decrease with an increase in temperature?

Consider two planets in space that gravitationally attract each other if the mass of one of them stays the same and the mass of the other is doubled AND the distance between them is doubled, then the force between them changes by what factor? A.

David delivers meals to elderly people once a week. He uses a cart to move the meals. The cart has four smooth wheels. Which type of friction acts between the cart wheels and the sidewalk? A. sliding friction B. rolling friction C. fluid friction D.

Current flows through a resistor; (a) with no direction since it is not a vector (b) from any potential to any different potential (c) from high potential to low potential (d) from low potential to high potential (e) cannot be determined

A concave mirror has a focal length of 11 cm. What is its radius of curvature?