Forces - Forces & Motion

Question 1

what does displacement measure

Answer 1

vector quantity that measures distance and direction in a straight line from the objects starting point

Question 2

what is the difference between speed and velocity

Answer 2

velocity includes direction

Question 3

what does an object have that is moving in a circle at a constant speed

Answer 3

constantly changing velocity

Question 4

what are the typical speeds for walking running cycling

Answer 4

walking 1.5m/s
running 3m/s
cycling 6m/s

Question 5

what are the typical speeds for a car train and plane

Answer 5

car 25m/s
train 55m/s
plane 250ms

Question 6

what is the equation for speed (m/s)

Answer 6

distance (m)/ time(s)

Question 7

what is acceleration

Answer 7

how quickly the velocity is changing

this can be a change in speed, direction or both

Question 8

what is the equation for acceleration (m/s2)

Answer 8

change in velocity / time (s)

Question 9

what does the gradient show on a distance time graph

Answer 9

speed

Question 10

what does a curve represent on a distance time graph

Answer 10

acceleration

Question 11

how do you work out the speed at a certain time when the object is accelerating

Answer 11

draw a tangent on the curve

Question 12

what axis does velocity go on a velocity time graph

Answer 12

y axis

Question 13

what does the gradient of a velocity time graph show you

Answer 13

acceleration

Question 14

what does a cure tell you on a velocity time graph

Answer 14

increasing acceleration

Question 15

how can distance be found on a velocity time graph

Answer 15

its the area under the line

Question 16

what direction does friction act in

Answer 16

opposite direction of movement

Question 17

what is a streamlined object

Answer 17

allows fluids to flow over it easily so the object isnt slowed down as
much by friction

Question 18

why does a cars engine have to work harder to maintain a steady speed at 70mph than at 20mph

Answer 18

frictional forces from fluids always increase with speed

Question 19

why does an object accelerate when it starts to fall

Answer 19

force of gravity is greater than frictional forces, however when it moves faster the frictional forces become greater until its balanced ( terminal velocity)

Question 20

what is a factor that effects terminal velocity

Answer 20

shape and area of object

the gravitational force

Question 21

what is newtons first law

Answer 21

if an object has a 0 resultant force it will remain in its current state of movement

Question 22

what are 5 ways an object can show a change in velocity

Answer 22

starting
stopping
speeding up
slowing down
changing direction

Question 23

what is the equation that shows newtons second law

Answer 23

force (N) = m(kg) x acceleration(m/s2)

Question 24

explain newtons second law

Answer 24

the larger the resultant force the more an object accelerates so force and acceleration are directly proportional

Question 25

what is the relationship between mass and acceleration

Answer 25

an object w a larger mass will accelerate less so the are inversely proportional to each other

Question 26

what is the tendency to remain in the same state of motion called

Answer 26

inertia

Question 27

what is an objects inertial mass

Answer 27

how difficult it is to change the velocity of an object

Question 28

how do you work out inertial mass

Answer 28

m = f/a

Question 29

what is newtons third law

Answer 29

when 2 objects interact, the forces they exert on each other are equal and opposite