Chapter 3: Forces and Motion

Question 1

Equilibrium

Answer 1

Occurs when the force in an object are balanced

Question 2

Force

Answer 2

Action that has the ability to change motion

Question 3

Friction

Answer 3

Force that results from relative motion between objects

Question 4

Gravity

Answer 4

Attractive force that exists between any two objects that have mass

Question 5

Inertia

Answer 5

Reluctance of a body to change its state of motion

Question 6

Law of conservation of momentum

Answer 6

As long as interacting objects are not influenced by outside forces their momentum before the interaction will equal their momentum after the interaction

Question 7

Mass

Answer 7

Measure of the inertia of an object

Question 8

Momentum

Answer 8

Mass of an object multiplied by its speed or velocity

Question 9

Air friction

Answer 9

Opposing force created by objects moving through the air

Question 10

Net force

Answer 10

Amount of force that overcomes an opposing force to cause motion

Question 11

Newton (N)

Answer 11

Unit of force

Question 12

Newton’s first law of motion

Answer 12

Any object at rest will remain at rest unless acted on by an unbalanced force

Question 13

Newton’s second law of motion

Answer 13

The acceleration of an object is directly proportional to the force acting on it and inversely proportional to its mass

Question 14

Newton’s third law of motion

Answer 14

Whenever one object exerts a force on another the second object exerts an equal and opposite force on the first

Question 15

Pounds

Answer 15

English system unit of force

Question 16

Rolling friction

Answer 16

Resistance created when one object rolls over another one

Question 17

Sliding friction

Answer 17

Resistance created when two surfaces rub against one another

Question 18

Vicious friction

Answer 18

Resistance created by objects moving in water or other fluids

Question 19

Weight

Answer 19

A force created by gravity