Unit 6, Section 1: Describing Motion and Force

Question 1

motion

Answer 1

when an object’s position changes in comparison to another object

Question 2

reference point

Answer 2

a place or object used to compare whether something is in motion

Question 3

force

Answer 3

a push or pull on an object
-measured in Newtons (N)

Question 4

types of forces

two types

Answer 4

-contact forces
-noncontact forces

Question 5

contact forces

Answer 5

forces applied when one object actually touches another

Question 6

friction

Answer 6

a contact force that two surfaces exert on each other when they rub against each other

Question 7

noncontact forces

Answer 7

applied to an object whether it touches the object or not

Question 8

gravity

Answer 8

a noncontact force that pulls objects towards each other as a result of their masses

Question 9

balanced forces

Answer 9

when two forces act on an object and are equal in strength and in the opposite direction

Question 10

unbalanced forces

Answer 10

when two forces act on an object but the force applied in one direction is stronger than the oher, causing it to move

Question 11

net force

Answer 11

the combination of all of the forces acting on an object