8.1 - speed and velocity

Question 1

Define displacement

Answer 1

distance in a given direction

Question 2

Define speed

Answer 2

change in distance per unit time

Question 3

define velocity

Answer 3

change in displacement per unit time

OR

sped with a given direction

Question 4

speed equation

Answer 4

V = S / t

Question 5

the equation for speed for an object, moving in a circle

Answer 5

V = (2πr) / t

Question 6

distance-time graphs

• what does the gradient =

Answer 6

speed

Question 7

distance-time graphs

• what does a cured graph show

Answer 7

the object is changingspeed

• curving to a vertical line = acceleration
• to a horizontal = deacceleration

Question 8

whats the main difference between distance-time graphs and displacement-time graphs

Answer 8

displacement-time graphs and a +ve and -ve y-axis since objects can come back into their origin

Question 9

what is Newton’s 1st law of motion

Answer 9

velocity of an object will not change unless a resultant force acts on it