physics

Question 1

What is a scalar quantity

Answer 1

-It has magnitude (size) only
-e.g. speed, mass

Question 2

What is a vector quantity?

Answer 2

-It has both magnitude (size) and direction
-e.g. weight

Question 3

How do u calculate distance travelled?

Answer 3

straight line- area=length( time) x width (speed)
sloped line= base (time) x height (speed)

Question 4

speed distance time triangle

Answer 4

s= d/t
d= s x t
t= d/s

Question 5

how do you find acceleration

Answer 5

a= change in velocity/change in time
a= v-u/t

Question 5

how do we calculate resultant force

Answer 5

often many different forces wil act on an object.
more than one force acting on an object can be replaced by a single overall force.
tyhis is called the resultant force
up thrust= 10N
resultant force 10 - 10 = 0N
gravity= 10N

Question 6

how do resultant forces effect the motion of an object

Answer 6

equals zero= remains still
does not equal zero= acceleration, deceleration, change direction

Question 7

whats gravity

Answer 7

the force that attracts a body towards the centre of the earth or towards any other physical body having mass

Question 8

what is mass

Answer 8

it is a measure of how many atoms is in a object
-measured in kilograms
- always remains the aame no matter where you are in the universe

Question 9

what is weight

Answer 9

weight= mass x gravitational field strength
newtons, kiolograms= newtons per kiolgrams
- w= m x g

Question 10

what is force

Answer 10

force= mass x acceleration

Question 11

what is newtons 2nd law of motion

Answer 11

1) as the force acting upon an object is increased, the acceleration of the onject is increased
2) as the mass of an object is increased, the acceleration of the object is decreased

Question 12

what is thinking distance

Answer 12

before we react to danger our brain takes time to think. the distance travelled during this time is thinking distance
- thinking distance= speed x reaction time

Question 13

what is braking distance

Answer 13

cars don’t stop straight away. they travel a certain distance after you start braking to loose their speed. this is breaking distance.

Question 14

factors that affect thinking distance

Answer 14

tiredness- think slower cant apply brakes fast
alcohol- alters how well u can judge hazards
drugs- make u less alert and less aware of hazards
distractions- loud music, phones, crying babies

Question 15

factors that effect braking distance

Answer 15

brakes- worn brakes dont work well, longer
tyres- worn tyres has good grip in dry but in wet takes longer
road surface- if wet/ice will take longer

Question 16

what is total stopping distance

Answer 16

thinking distance + braking distance