Question 1

Distance from another object is changing.

Accepted Answer

Motion

Question 2

Used to compare against if an object is moving.

Accepted Answer

Reference point

Question 3

Distance per unit of time (meters per second, miles per hour)

Accepted Answer

Speed

Question 4

Speed and direction

Accepted Answer

Velocity

Question 5

The rate velocity changes.

Accepted Answer

Acceleration

Question 6

A push or pull on an object.

Accepted Answer

Force

Question 7

The force to accelerate 1 kg at 1 meter per sec per sec

Accepted Answer

Newton

Question 8

The overall force on an object when all other forces are added together.

Accepted Answer

Net force

Question 9

Forces that give a non-zero net force, cause an object to move.

Accepted Answer

Unbalanced forces

Question 10

Forces that give a zero net force, cause an object to stay in place.

Accepted Answer

Balanced forces

Question 11

Force caused when surfaces rub.

Accepted Answer

Friction

Question 12

Force that pulls objects together.

Accepted Answer

Gravity

Question 13

Motion when only gravity acts on an object.

Accepted Answer

Free fall

Question 14

Fluid friction when an object falls through air.

Accepted Answer

Air resistance

Question 15

Greatest velocity possible while falling through air.

Accepted Answer

Terminal velocity

Question 16

The law of inertia: objects resist change.

Accepted Answer

Newton's 1st law

Question 17

F=ma (Force = mass times acceleration).

Accepted Answer

Newton's 2nd law

Question 18

For every action there is an equal and opposite reaction.

Accepted Answer

Newton's 3rd law

Question 19

Equals mass times velocity.

Accepted Answer

Momentum

Question 20

In the absence of outside forces, total momentum does not change.

Accepted Answer

Law of conservation of momentum

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