Forces and Motion

Question 1

what does the gradient of a distance time graph show?

Answer 1

speed

Question 2

what does the gradient of a speed time graph show?

Answer 2

acceleration

Question 3

what does the area under a speed time graph show?

Answer 3

distance. travelled

Question 4

what is mass?

Answer 4

the amount of matter in a body measured in kilograms

Question 5

what is weight?

Answer 5

a FORCE measured in newtons

Question 6

what is reaction force?

Answer 6

acts perpendicular to a surface

Question 7

which direction does gravity and weight act in?

Answer 7

downwards

Question 8

what is thrust?

Answer 8

push or pull due to engine

Question 9

what is drag, air resistance or friction?

Answer 9

slows things down, opposes motion

Question 10

how can you reduce friction?

Answer 10

put a lubricant between the surfaces

Question 11

how do you reduce resistance and drag in fluids?

Answer 11

keep the shape of the objects streamlined

Question 12

what are the three laws of motion?

Answer 12

balanced forces means no change in velocity
a resultant force means acceleration
an objects exerts an equal and opposite force to the one that is being applied to it

Question 13

what is a vector?

Answer 13

has size and direction

Question 14

what is a scalar?

Answer 14

only has a size

Question 15

give some examples of vectors

Answer 15

force
velocity
acceleration
momentum

Question 16

give some examples of scalars

Answer 16

mass
temp
time

Question 17

what is terminal velocity?

Answer 17

if there is no resultant force an object will move at a constant velocity. if there is no drag it will accelerate at 10 m/s2

Question 18

what is acceleration of freefall?

Answer 18

all objects in freefall accelerate at 10m/s2

Question 19

what does the terminal velocity of an object depend upon?

Answer 19

the objects shape and area

Question 20

what is Hooke’s Law?

Answer 20

extension is proportional to force

Question 21

can a material return to its original shape after an elastic deformation?

Answer 21

yes

Question 22

what is the stopping distance equation?

Answer 22

thinking distance + braking distance

Question 23

what affects thinking distance?

Answer 23

speed
tiredness
alcohol

Question 24

what affects braking distance?

Answer 24

speed
road surface
tyre surface
tyre condition

Question 25

what does momentum before a collision equal?

Answer 25

momentum after

Question 26

equation for force (momentum)

Answer 26

change in momentum / time

Question 27

what is a moment?

Answer 27

the turning effect of a force

Question 28

what is the function of a crumple zone/

Answer 28

they crumple upon impact which increases the time taken for the car to stop.

Question 29

what name is given to the point throughout all and object’s weight acts?

Answer 29

centre of gravity.