newtons law

Question 1

Drag

Answer 1

Resistance you get in fluid
air resistance=
frictional force produced by air acting on the moving object

Question 2

Friction

Answer 2

2 objects rub together to slow down or stop an object
opposite to direction of movement
frictional and driving force needs to be balanced for steady speed
friction is between 2 surfaces in contact

Question 3

Important factor to reduce track

Answer 3

keeping a streamline shape allows object to flow easily parachutes need as much drag as they can get

Question 4

Drag and speed relationship

Answer 4

Drag increases a speed increases

more work has to be done to maintain a steady speed

Question 5

terminal velocity

Answer 5

Objects falling for long enough reach terminal velocity
balance between weight and air resistance
constant direction in steady speed
resultant force is zero

Question 6

three stages of falling

Answer 6

start object accelerates downwards due to gravity force being larger than air resistance

object speed increases frictional forces increase

gradually acceleration is decreased frictional force = accelerating force
reaching terminal velocity as resultant force = zero

Question 7

sky diver diagram

Answer 7

sky diver accelerates as they begin to fall

sky diver speeds up as air resistance increases

at terminal velocity air resistance and weight are equal so speed = constant

parachute opens which increases air resistance due to shape and area

this slows the sky diver down

sky diver continues to slow down until new frictional forces and weight are equal

new terminal velocity

Question 8

newtons first law

Answer 8

object remains stationary unless resultant force acts on it
if resultant force = 0
stationary object stationary
moving object moves at constant velocity

Question 9

acceleration

Answer 9

slowing down 
speeding in 
stopping 
changing directions 
starting

Question 10

resultant force

Answer 10

larger resultant force the more object
directly proportional

acceleration is inversely proportional to mass

Question 11

inertia

Answer 11

tendency of object to continue in current state

Question 12

uniform motion

Answer 12

if a car is travelling at constant velocity driving force = frictional forces
resultant force = 0

falling at terminal velocity

Question 13

non uniform motion

Answer 13

speed//direction change

resultant force is not 0

Question 14

newtons second law

Answer 14

F = ma

Question 15

inertial mass

Answer 15

force / acceleration

measures how difficult it is to change

Question 16

newtons third law

Answer 16

when two objects interact the forces they exert on each other are equal and opposite

but they opposite forces act on different objects