Vectors and scalars

Question 1

scalars

Answer 1

a scalar quantity is a quantity that has magnitude only and has no direction in space eg. length, volume

Question 2

examples of scalar quantities

Answer 2

length 
area
volume
time
mass
frequency
volume
denity

Question 3

quantity

Answer 3

any physical property that can be measured

Question 4

vectors

Answer 4

a vector quantity is a quantity that has both magnitude and a direction in space eg. velocity, force

Question 5

the vector quanitities

Answer 5

• displacement
• velocity
• acceleration
• force
• momentum
• electric field strength
• magnetic flux density

Question 6

vector diagrams

Answer 6

shown using an arrow

• length of arrow represents its magnitude
• direction of arrow shows its direction

Question 7

resultant of 2 vectors

Answer 7

the resultant is the sum or the combined effect of two vector quantities

Question 8

the parallelogram law

Answer 8

when two vectors are joined tail to tail, the resultant is found by drawing the diagonal

Question 9

the triangle law

Answer 9

when two vectors are joined head to tail, the resultant vector is gotten by completing the triangle

Question 10

eg of vector problems

Answer 10

in hardback

Question 11

measurement

Answer 11

must always use SI units when working w/ calculations

Question 12

SI Unit & scalar/vector? - mass

Answer 12

kilogram (kg)

scalar

Question 13

SI Unit & scalar/vector? - length (distance)

Answer 13

metre (m)

scalar

Question 14

SI Unit & scalar/vector? - time

Answer 14

second (S)

scalar

Question 15

SI Unit & scalar/vector? - speed

Answer 15

metre per second (m/s)

scalar

Question 16

displacment

Answer 16

the distance of a body from a fixed point in a particular direction/change in position of an object

Question 17

displacement unit

Answer 17

metre, vector

Question 18

velocity

Answer 18

rate of change of displacement with respect to time

Question 19

velocity uniyt

Answer 19

m/s , vector

Question 20

acceleration

Answer 20

the rate of change of velocity

Question 21

acceleration unit

Answer 21

m/s/s

Question 22

equations

Answer 22

in hback

Question 23

straight line on distance-time graph

Answer 23

object is moving with constant velocity

Question 24

slope on distance-time graph

Answer 24

speed of the object

Question 25

acceleration (2)

Answer 25

a body travelling at a constant speed has acceleration if it is changing direction

Question 26

equations of motion derivations

Answer 26

in hback

Question 27

velocity-time graph

Answer 27

velocity - given by graph
acceleration - given by slope of graph
distance travelled - given by area under graph

a velocity-time graph of a body moving w constant acceleration is a straight line

Question 28

acceleration due to gravity

Answer 28

• ignoring air resistance, the acceleration due to gravity is the same for all bodies at the same place
• a body falling freely experiences an acceleration (g) toward the centre of the earth
• g always acts downwards + it is given as 9.8 m/s/s