Dynamics

Question 1

how do you calculate average velocity in the trolley problem?

Answer 1

entire length of journey divided by the total time taken

Question 2

How do you calculate the instantaneous velocity in the trolley problem?

Answer 2

length of the mask divided by time taken for mask to pass through lightgate

Question 3

how do you calculate average speed?

Answer 3

v = d/t
ave. speed = distance/time

Question 4

how do you calculate instantaneous speed?

Answer 4

v = mask length/time taken

Question 5

what is average speed/speed measured in?

Answer 5

ms -1

Question 6

what is distance measured in?

Answer 6

m (metres)

Question 7

what is time measured in?

Answer 7

s (seconds)

Question 8

what is displacment represented as and measured in?

Answer 8

s and m(metres)

Question 9

how do you calculate acceleration on a speed/time graph?

Answer 9

measure the gradient of the graph ( a = v-u/t )

Question 10

how do you calculate displacment/distance on a speed time graph?

Answer 10

measure the area under the graph

Question 11

how do you calculate speed/velocity on a speed time graph?

Answer 11

calculate area under the graph divided by the total time of the x axis

Question 12

how do you calculate the work done?

Answer 12

Ew = Fd
work done = force x distance

Question 13

how do you calculate potential energy?

Answer 13

Ep = mgh
potential energy = mass x gravitation field strength x height

Question 14

how do you calculate kinetic energy?

Answer 14

Ek = 1/2 x mv squared
Kinetic energy = 1/2 x mass x velocity squared

Question 15

what is velocity?

Answer 15

the change in displacment per unit of time

Question 16

how do you calculate displacment?

Answer 16

s = vt
displacment = velocity x time

Question 17

how do you calculate average velocity?

Answer 17

ave. vel. = s/t
average velocity = displacment/time

Question 18

when does projectile motion occur?

Answer 18

when an object has both a constant horizontal velocity and a constant vertical acceleration

Question 19

how do you calculate horizontal velocity?

Answer 19

v = dt
velocity = distance x time

Question 20

how do you calculate vertical velocity?

Answer 20

v = u + at
velocity = initial v. + accel. x time

Question 21

what is horizontal motion?

Answer 21

motion that goes at a constant velocity

Question 22

how do you calculate horizontal distance?

Answer 22

Dh = Vh x t
horizontal distance =
horizontal vel. x time

Question 23

what is vertical motion?

Answer 23

motion with a constant acceleration/increasing velocity

Question 24

how do you calculate vertical distance?

Answer 24

measuring area under a speed/time graph

or

distance(height) = ave. speed x time

Question 25

what is newton’s first law of motion?

Answer 25

an object will remain at rest or going at the same speed/direction unless acted on by an unbalanced force

Question 26

what is newton’s second law of motion?

Answer 26

if mass remains constant, an object’s acceleration is directly proportional to the unbalanced force applied

Question 27

what is newton’s third law of motion?

Answer 27

every action has an equal opposite reaction

Question 28

what is terminal velocity?

Answer 28

the velocity something travels at when the forces acting on it are balanced

Question 29

what are balanced forces?

Answer 29

equal forces going in opposite directions

Question 30

how do you calculate unbalanced forces?

Answer 30

F = ma
force = mass x acceleration