Newtons laws of motion

Question 1

What is newton’s second law

Answer 1

the accelertaion of an object is proportional to the resultant force acting on an object and inversely proportional to the mass of each object .
experessed as
resultant corce = mass a
f=ma

Question 2

what is newtons first law

Answer 2

an object will stay stationary or continue moving at the same speed and direction unless a resultant force is applied .

Question 3

how do u work out inrtia

Answer 3

force/acceleration

tendency for an object to stay at rest or in uniform motion

Question 4

how to calculate wieght

Answer 4

weight =mg

Question 5

what is a force

Answer 5

a force is a push or pull that acts on an object because of its interactio ith another object.

Question 6

what can forces do

Answer 6

forces can hage the shape
motion
or state of rest

Question 7

describe motion of diver enetring water

Answer 7

as diver enters wate , they diver will decelerate as air resistance in water is greater than in the air , Upwardds force on diver m so upwards resultant force .

Question 8

what is newtons third law

Answer 8

when two object interact with eachother they exert equal and opposite forces on eachother .

Question 9

example of contact force

Answer 9

gravity

Question 10

example of noncontact

Answer 10

air resistance

Question 11

menng of proportional

Answer 11

bigger force means more accelerationin

Question 12

inversely proprotional

Answer 12

bigger mss ,less accelration

Question 13

what is reusltant foce at constant vvelocity

Answer 13

zero - as all oher forces acting on object are zero

Question 14

what does braing force depend on

Answer 14

spead of the vehicle as breaks are applied

mass of the vehicle

Question 15

equation trinagle for thinking ditance

Answer 15

thinking distance

speed *reaction time

Question 16

what is braking distance

Answer 16

the distance travelled by the vehicle after dirver applies break

Question 17

How do u calcule braking distance

Answer 17

f=m*a =brking distance

Question 18

how do u calculate stopping distance

Answer 18

stopping ditsnce = thinking distance +brakinng distance

Question 19

what factor affect thinking ditsance and why

Answer 19

tiredness and alchol affect thinking ditance as they increase thinking distance so stopping distance is greater .
And mobile

Question 20

factors affecitng braking distance

Answer 20

weaher -slippery-stopping distance increases

Worn out tyres - take longer to break

Question 21

Required practical 1

Answer 21

accelration is proportional to FORCE

Question 22

why would more mass =more inenerita

Answer 22

as it is more difficult to stop start and change direction

Question 23

independenr variabalesof p1

Answer 23

independent-change in mass
Dependent variable -accelration of troley
control - 20cm intervals on bench

Question 24

Method for p1

Answer 24

Attach a string to the object and hang the string over a pulley on the edge of the
table.
2. Connect a weight stack to the other end of the string.
3. Use either a ruler and a stopwatch or a set of light gates to measure the velocity
of the object as it moves.
4. Add a weight to the weight stack and record the velocity of the object at different
points.
5. Vary the weights on the weight stack and record the change in velocity for each weight

Question 25

improvement for both practicls

Answer 25

use a light gate - more accurae timngns

Question 26

extend practical

Answer 26

further distances , more masses

Question 27

requried practical 2

Answer 27

acceleration is inversley proportion to mass

Question 28

required practical variables

Answer 28

independent varibales - changin mass in trolley
dependent - acceration
contol - 20cm intervals on bench

Question 29

method

Answer 29

record intial mass of trolley
attach chosen mass to a string which owuld be a constant force on the teolley
release trolley andsimultaneously start stopwatch and time how long it takes for the trolley to ravel
repeat the pervious steps by increasin mass of trolley eachtime .

Question 30

how to work otu acceleration

Answer 30

change in velocity /time taken

Question 31

newtons first law

Answer 31

if the resultant force acting on a stationary object is zero , then the object will remain stationary , or keeps movig at the same spped in the same direction .

Question 32

Describe sky diver ju,pingout

Answer 32

as soon as they jump , the sky diver accelerates rapidly , as th only force acting on them is weight , this is due to gravity .
Downwards resultant force .
They skdiver experiences friction with the air molecules this is air -reistnce .
However weight is greatee rhna air restiance so continues to accelerate downwards .
as the velocity increases - air resistance also increases
at a certai n point both forces are balaned , has reached terminal velocity - reusltant force is zero .
Open Parachute :- surface increasses , air resistnce mssively increases .
At this point , air resistance now greater than the weight so resultant force is upwards .
This causes the skydiver to decellerate , velocity decreses =air ressitane increses .

Question 33

Describe sky diver ju,pingout

Answer 33

as soon as they jump , the sky diver accelerates rapidly , as th only force acting on them is weight , this is due to gravity .
Downwards resultant force .
They skdiver experiences friction with the air molecules this is air -reistnce .
However weight is greatee rhna air restiance so continues to accelerate downwards .
as the velocity increases - air resistance also increases
at a certai n point both forces are balaned , has reached terminal velocity - reusltant force is zero .
Open Parachute :- surface increasses , air resistnce mssively increases .
At this point , air resistance now greater than the weight so resultant force is upwards .
This causes the skydiver to decellerate , velocity decreses =air ressitane increses .
So sky diver falling at lower temrinal velocity , safe for them to hit the ground

Question 34

factors affecitng terminal velocity

Answer 34

mass - bigger mass-larger termial velocity
larger tsurfae area - lowee the terminal velocity
Density of fluid - denser the fluid - lower the terminal velocity .

Question 35

terminal velocity meaning

Answer 35

velocity reached by an objects when the drag force on it is euqal and opposite to the force making it move .