Our dynamic universe

Question 1

scalar

Answer 1

A quantity that consists of a magnitude only

Question 2

vector

Answer 2

a quantity that consists of a magnitude and direction

Question 3

distance

Answer 3

how far an object has travelled from starting point to the finishing point of a journey

Question 4

displacement

Answer 4

how far an object has travelled from starting point to the finishing point of a journey, which takes into account direction of travel (vector)

Question 5

speed

Answer 5

distance per unit time

Question 6

average speed

Answer 6

total distance / total time

Question 7

velocity

Answer 7

displacement per unit time (vector)

Question 8

average velocity

Answer 8

vector equivalent of average speed

Question 9

resultant vector

Answer 9

final vector drawn from starting point to finishing point

Question 10

acceleration

Answer 10

change in velocity per unit time

Question 11

deceleration

Answer 11

negative acceleration (shows object is slowing)

Question 12

friction

Answer 12

a force between two solid objects opposes motion of an object

Question 13

drag

Answer 13

a force between a solid and liquid which opposes the motion of an object

Question 14

air resistance

Answer 14

a force between a solid and air particles which opposes the motion of an object

Question 15

balanced forces

Answer 15

any situation where vector sum = 0

Question 16

unbalanced forces

Answer 16

where vector sum doesn’t equal 0

Question 17

newtons 1st law

Answer 17

an object will remain at rest or move at a constant speed in a straight line unless acted on by an unbalanced force

Question 18

newtons 2nd law

Answer 18

acceleration of an object is proportional to the unbalanced force acting on it F=ma

Question 19

newtons 3rd law

Answer 19

if object A experts a force on object B then B exerts an equal and opposite force on A