P10 - Momentum + Velocity

Question 1

resultant force formula

Answer 1

mass x acceleration

Question 2

unit for acceleration

Answer 2

m/s^2

Question 3

Newton’s second law of motion

Answer 3

acceleration:
is proportional to resultant force
inversely to mass

Question 4

Inertia

Answer 4

tendency of object to stay at rest or continue in uniform motion

Question 5

inertial mass

Answer 5

measure of difficulty of changing the object’s velocity

Question 6

inertial mass formula

Answer 6

force/acceleration

Question 7

positive acceleration

Answer 7

velocity increases
force is same direction as velocity

Question 8

negative acceleration

Answer 8

velocity decreases
force is in opposite direction

Question 9

Greater resultant force on object

Answer 9

greater object’s acceleration

Question 10

Greater mass =

Answer 10

smaller acceleration

Question 11

weight

Answer 11

force acting on it due to gravity

Question 12

mass

Answer 12

depends on quantity of matter

Question 13

gravity

Answer 13

9.8

Question 14

weight formula

Answer 14

gravity x mass

Question 15

terminal velocity formula

Answer 15

force = weight - frictional force

Question 16

terminal velocity meaning

Answer 16

object reaches a constant velocity when force on it is equal and opposite to its weight

-resultant + acceleration = 0
-weight = frictional force

Question 17

velocity of object acted on by only gravity

Answer 17

10

Question 18

braking force depends i=on

Answer 18

speed of vehicle
-mass

Question 19

greater speed =

Answer 19

greater deceleration

Question 20

greater mass =

Answer 20

greater braking force

Question 21

stopping distance

Answer 21

shortest distance a vehicle can safely stop in

Question 22

thinking distance

Answer 22

distance travelled by vehicle in the time it takes driver to react

Question 23

thinking distance formula

Answer 23

speed x reaction time

Question 24

braking distance

Answer 24

distance travelled by vehicle during time braking force acts in it

Question 25

stopping distance formula

Answer 25

thinking + braking distance

Question 26

factors affecting stopping distnace

Answer 26

-alcohol/ drugs -tiredness -thinking distance -weather -worn brakes -speed

Question 27

acceleration formula

Answer 27

a = v^2 - u^2/2s v = final velocity u = initial velocity s = distance

Question 28

braking force formula

Answer 28

f = ma

Question 29

momentum unit

Answer 29

kg m/s

Question 30

momentum formula

Answer 30

mass x velocity

Question 31

momentum vector or scalar

Answer 31

vector size and direction

Question 32

conservation of momentum

Answer 32

total before = total after an event in a closed system -no resultant force acts on it

Question 33

momentum of object A =

Answer 33

- momentum of obejct B

Question 34

momentum of A + momentum of B =

Answer 34

0

Question 35

longer impact time =

Answer 35

more impact force is reduced

Question 36

force, mass, velocity, time formula

Answer 36

f = m x v /t

Question 37

when vehicles collide, force of impact depends on

Answer 37

mass velocity length of impact time

Question 38

when 2 vehicles collide

Answer 38

they exert equal and opposite forces on each other -total momentum is unchanged

Question 39

impact force formula

Answer 39

change of momentum /impact time

Question 40

shorter impact time =

Answer 40

greater force

Question 41

cycle helmet + cushioned ground safety

Answer 41

reduces impact -increases impact time

Question 42

seat belts + air bags safety

Answer 42

spread force across chest -increase impact time

Question 43

crumple zones safety

Answer 43

give way in impact increase impact time

Question 44

elastic

Answer 44

can bend back to shape when forces deforming it are removed

Question 45

extension

Answer 45

increase of length from original

Question 46

extension of strip formula

Answer 46

length at stage - original length of spring

Question 47

Hooke's Law

Answer 47

-extension is directly proportional to force -as long as limit of proportionality isn't exceeded

Question 48

limit of proportionality

Answer 48

cannot bend back into shape

Question 49

Hooke's law formula

Answer 49

f = ke

Question 50

stiffer the spring =

Answer 50

greater the spring constant

Question 51

beyond the limit of proportionality = which type of relationship

Answer 51

non-linear