!! 6.5.4.1, Describing motion along a line

Question 1

what is distance

does distance involve direction

is distance a vector or scalar quantity

Answer 1

how far an object moves

distance does not involve direction

scalar

Question 2

what is displacement

Answer 2

the distance an object moves,

measured in a straight line from the start point to the finish point

and the direction of that straight line

Question 3

is the speed of a moving object constant

Answer 3

the speed of a moving object is rarely constant

when people walk, run or travel in a car their speed is constantly changing

the speed of sound and wind vary too

Question 4

typical speeds for:

running

walking

cycling

Answer 4

walking = 1.5 m/s

running = 3 m/s

cycling = 6 m/s

Question 5

what are 4 factors that affect the speed a person can walk, run or cycle at

Answer 5

age

terrain

distance they’re traveling

their fitness levels

Question 6

what are the measurements for

distance

speed

time

Answer 6

distance = metres, m

speed = m/s

time = seconds

Question 7

what is the velocity of an object

Answer 7

its speed in a given direction

Question 8

what does motion in a circle involve

Answer 8

constant speed but changing velocity

Question 9

what can be represented by a distance-time graph

Answer 9

the distance travelled by an object if it moves in a straight line

Question 10

how can the speed of an accelerating object be calculated using a distance-time graph

Answer 10

by drawing a tangent

and measuring the gradient of the distance–time graph at that time

Question 11

what are the measurements of:

acceleration

change in velocity

time

Answer 11

acceleration = m/s squared

change in velocity = m/s

time = seconds