7.1 Speed and velocity

Question 1

What is displacement?

Answer 1

» Distance in a given direction

Question 2

What is speed?

Answer 2

» Defined as change of distance per unit time

Question 3

What is velocity?

Answer 3

» The change of displacement per unit time
» Speed in a given direction

Question 4

What are the units of speed and velocity?

Answer 4

» m/s

Question 5

What is the equation for speed?

Answer 5

» Distance /over time

Question 6

What is the equation for constant speed in a circular body?

Answer 6

» V = Circumference / T

Question 7

What is the equation for average speed?

Answer 7

» Total distance / Total time

Question 8

What is the equation for instataneous speed?

Answer 8

» Change in distance/ Change in time

Question 9

What does the delta notation mean?

Answer 9

» Change

Question 10

What does instantaneous speed mean?

Answer 10

» Means speed at that time

Question 11

What is the gradient of a line if an object is moving at constant speed in a distance time graph?

Answer 11

» Constant gradient
» Which is also equal to the speed of the object = gradient

Question 12

How can the gradient of a line at any point be found?

Answer 12

» By drawing a tangent

Question 13

What is one tip to remember when drawing a tangent?

Answer 13

» Make the triangle as big as possible to reduce error

Question 14

What does a horizontal line show in a distance time graph?

Answer 14

» Object has stopped

Question 15

What does a curve upward show in a distance time graph?

Answer 15

» It is accelerating

Question 16

What does a curved line downwards show in a distance time graph?

Answer 16

» Object is deaccelerating

Question 17

Why does an object moving on a circular path have constant speed but not velocity?

Answer 17

» Because the direction of motion changes continously

Question 18

What does a straight line on displacement time graph show?

Answer 18

» Constant velocity

Question 19

What does a horizontal line show in a displacement time graph?

Answer 19

» Object is stationary

Question 20

What does a curved line upward show in a displacement time graph?

Answer 20

» Object is accelerating

Question 21

What does a curved line who’s gradient is decreasing show?

Answer 21

» It is deaccelerating as its velocity is decreasing

Question 22

What does the gradient of a displacement time graph show?

Answer 22

» Velocity