What does Newton's first law describe

A. The relationship between force, mass and acceleration

B. Action-reaction pairs

C. How friction and the normal force are related

D. How inertia affects the motion of an object

Mary and her younger brother Alex decide to ride the 17 - foot-diameter carousel at the State Fair. Mary sits on one of the horses in the outer section at a distance of 8 feet from the center.

1. When an object moves it acquires (a) friction (b) traction (d) speed (c) energy of motion

The energy levels for electrons vary from one element to another. True or False

A basketball rolls off a deck that is 3.2 m from the pavement. The basketball lands 0.75 m from the edge of the deck. How fast was the basketball rolling? Seema lists the given values in a chart and determines that the unknown value is vx.

Sally walks 10 meters forward and then 5 meters backwards. Which statement most accurate describes the magnitude of her displacement and distance traveled? A) Sally's displacement is 5m less than her distance traveled.

If there are 20 Earthworms in a garden that covers 5 square meters, what is the population density of the earthworms? A. 20 Earthworms B. 4 C. 100 Earthworms per square meter D. 4 Earthworms per square meter

How are AC and DC generators different? In AC generators, commutators produce alternating current. In AC generators, no commutators or slip rings are used. In DC generators, slip rings produce direct current.

A 30.0-kg object experiences a drag force due to air resistance with a magnitude proportional to the square of its speed. The object falls with an acceleration of 4.00 m/s2 downward when it is falling downward at 70.0 m/s.

If a tank contains water 4 m deep, what is the pressure at the bottom of the tank? (Neglect the atmospheric pressure.)

Eli rolled a ball down the cement sidewalk as hard as he could. The ball rolled for less than a minute before it came to a stop. What force acted to slow and finally stop the ball? A.