Unit 2

Question 1

Acceleration

Answer 1

rate of change in velocity, which is the change in velocity divided by the change in time

Question 2

Deceleration

Answer 2

acceleration in the opposite direction as the velocity of the object; results in speed decreasing

Question 3

Electromagnetic Force

Answer 3

attractive or repulsive force acting between charged particles

Question 4

Electromagnetism

Answer 4

properties and interactions of objects with electric and magnetic fields

Question 5

Force

Answer 5

a push or pull; any quantity that produces, or is capable of producing, motion

Question 6

Friction

Answer 6

force of resistance acting between objects in contact and tending to dampen their motion

Question 7

Gravity

Answer 7

force of attraction between all masses in the universe

Question 8

Inertia

Answer 8

\ih-NUHR-shuh\

an object´s resistance to a change in motion

Question 9

Mass

Answer 9

the amount of matter an object is made up of and the measure of the amount of inertia (resistance to change in momentum) the object has, measured in grams

Question 10

Momentum

Answer 10

an object´s resistance to its motion changing, expressed as the object´s mass times the object´s velocity

Question 11

Newton

Answer 11

the unit of force in the metric system; it is a unit derived from mass and acceleration (speed over time in a direction)

Question 12

Speed

Answer 12

the rate at which an object changes position

Question 13

Velocity

Answer 13

\veh-LAH-suh-tee\
the rate at which an object changes position when traveling in a certain direction, expressed as a rate: the distance an object traveled from one position to the next divided by the time it took to travel the distance