Force and Motion

Question 1

what does a straight line represent in a distance time graph

Answer 1

constant speed

Question 1

what does a distance-time graph show

Answer 1

how the distance of an object changes over time

Question 2

what does a flat, horizontal line mean in a d-t graph

Answer 2

stantionary

Question 3

how to calculate speed in a d-t graph

Answer 3

gradient: rise/run

Question 4

what does speed of an object mean

Answer 4

the distance it travels every second

Question 5

average speed equation

Answer 5

distance moved/ time taken

Question 6

accelration defenition

Answer 6

rate of change of velocity

Question 7

acceleration equation

Answer 7

change in velocity/ time taken

Question 8

object is slowing down

Answer 8

acceleration is negative

Question 9

how to calculate acceleration on a v-t graph

Answer 9

gradient: rise/run

Question 10

what does the area under a velocity time graph represent

Answer 10

displacement

Question 11

how to calculate uniform acceleration

Answer 11

v^2=u^2 + 2as

Question 12

how can forces affect bodies

Answer 12

change speed
change direction
change in shape

Question 13

types of forces

Answer 13

gravitational
electrostatic
thurst
upthrust
air resistance
compression
tension
reaction force

Question 14

gravitational

Answer 14

the force between 2 objects with mass

Question 15

electrostatic

Answer 15

the force between 2 objects with charge

Question 16

thrust

Answer 16

the force pushing on a vehicle

Question 17

upthrust

Answer 17

the upward force on an object in fluid
eg. boat on river

Question 18

air resistance

Answer 18

force of friction between objects falling through the air

Question 19

compression

Answer 19

forces that squeeze an object

Question 20

tension

Answer 20

forces that strech an onject

Question 21

reaction force

Answer 21

the force between 2 objects in contact

Question 22

scalar quantities

Answer 22

quantities with only a magnitude

Question 23

vectors

Answer 23

both a magntitude and a direction

Question 24

scalars

Answer 24

distance speed mass energy volume density temperature power

Question 25

vector

Answer 25

displacement velocity weight force acceleration momentum

Question 26

friction

Answer 26

the force which opposes the motion of an object

Question 27

balanced forces

Answer 27

forces have combines in a way where they cancel each other out so there is no resultant force

Question 28

unbalanced force

Answer 28

forces which do not cancel each other out so there is a resultant force on the object

Question 29

force equation

Answer 29

F (N)= m (kg) x a (m/s^2)

Question 30

weight

Answer 30

the force acting on an object due to gravitational attraction

Question 31

weight equation

Answer 31

weight (N) = m(kg) x g (ms^-2)

Question 32

mass

Answer 32

the amount of matter in an object

Question 33

stopping distance

Answer 33

the total distance travelled during the time it takes for a car to stop response to some emergency

Question 34

stopping distance equation

Answer 34

stopping distance= thinking distance + breaking distance

Question 35

breaking distance

Answer 35

distance travelled under the braking force

Question 36

thinking distance

Answer 36

distance travelled in the time it takes for the driver to react

Question 37

factors which affect stopping distance

Answer 37

1) vehicle speed 2) vehicle mass 3) Road conditions 4) driver reaction time

Question 38

what are the 2 forces an object experiences when it falls

Answer 38

weight gravity

Question 39

hookes law

Answer 39

the extension of an elastic object is directly proportional to the force applied, until the limit of proportionality

Question 40

limit of proportionality

Answer 40

when more force is added, the object may extend but it wont return to its original shape when the force is removed

Question 41

is hookes law linear or non linear

Answer 41

linear so it shows a straight line

Question 42

elastic deformation

Answer 42

when the object returns to its original shape when the stretching force is removed

Question 43

inelastic deformation

Answer 43

when the object remains stretched and does not return completely to its original shape even when the stretching force is removed.

Question 44

momentum equation

Answer 44

p (kgm/s) = m x velocity (m/s)

Question 45

does an object at rest have momentum

Answer 45

no

Question 46

what does momentum depend on

Answer 46

direction of travel

Question 47

the moment of an object changes if:

Answer 47

- change in acceleration - change in direction - its mass changes

Question 48

conservation of momentum

Answer 48

in a closed system, the total momentum before an event is equal to the total momentum after the event

Question 49

force equation 2

Answer 49

F= Change in P/ change in time

Question 50

newtons third law

Answer 50

when 2 bodies interact, the forces they exert on each other are equal and opposit

Question 51

how can the force of an impact in a vehicle collision be decreased

Answer 51

increasing the contact time

Question 52

safety features in cars

Answer 52

crumple zones seat belts air bags

Question 53

crash mats

Answer 53

thick and soft to offer shock absorption of the force which increases contact time

Question 54

moment

Answer 54

the turning effect of a force about a pivot

Question 55

moment eqaution

Answer 55

M (Nm) = F X d (m)

Question 56

why is a door handle placed on the opposite side to the hinge

Answer 56

- creates a larger perpendicular distance - which creates a larger moment to make it easier to open a door

Question 57

principle of moments

Answer 57

if an object is balances, the total clockwise moment about a pivot is equal to the total anticlockwise moment about a pivot

Question 58

Equation for conservation of moments

Answer 58

F2 x d2 = (F1X D1) + (F3 X d3)

Question 59

a light beam is treated as if it has _________

Answer 59

no mass

Question 60

centre of gravity

Answer 60

the point through which the weight of an object acts - located at the point of symmetry