KINEMATICS

Question 1

What is the difference between mean speed and instantaneous speed?

Answer 1

mean speed = total distance travelled/total time taken instantaneous speed is the rate of change of distance

Question 2

What is the difference between mean velocity and instantaneous velocity?

Answer 2

mean velocity = total displacement/total time taken instantaneous velocity is the rate of change of displacement

Question 3

What is the difference between mean acceleration and instantaneous acceleration?

Answer 3

mean acceleration = change in velocity/time taken instantaneous acceleration is the rate of change of velocity

Question 4

What does the gradient of a displacement-time graph represent?

Answer 4

Velocity

Question 5

What does the gradient of a velocity-time graph represent?

Answer 5

Acceleration

Question 6

How can displacement be found from a velocity-time graph?

Answer 6

Area under the graph

Question 7

What condition is needed for the equations of motion (xuvat)?

Answer 7

Constant acceleration (no friction / air resistance)

Question 8

What does x represent in the kinematic equations (xuvat)?

Answer 8

distance (displacement)

Question 9

What does u represent in the kinematic equations (xuvat)?

Answer 9

initial velocity

Question 10

What does v represent in the kinematic equations (xuvat)?

Answer 10

final velocity

Question 11

What does a represent in the kinematic equations (xuvat)?

Answer 11

acceleration

Question 12

What does t represent in the kinematic equations (xuvat)?

Answer 12

time

Question 13

When do we assign a negative acceleration to an object?

Answer 13

when an object is thrown upwards

Question 14

When an object is thrown up in the air when will it have a speed of 0m/s?

Answer 14

At its maximum height

Question 15

What is acceleration due to gravity on Earth?

Answer 15

9.81m/s²

Question 16

If an object starts at rest what is its initial velocity?

Answer 16

0m/s

Question 17

For a projectile which velocity are kinematic equation applied to?

Answer 17

Vertical velocity (constant acceleration due to gravity)

Question 18

For a projectile how can we calculate horizontal velocity?

Answer 18

speed = distance / time (no acceleration)

Question 19

What is a terminal velocity?

Answer 19

Constant maximum velocity when the resistive forces are equal and opposite to accelerating forces (balanced)