motion & forces

Question 1

newton’s first law states

Answer 1

an object has a constant velocity unless acted on by a resultant firce

Question 2

newton’s second law states

Answer 2

force = mass x acceleration

Question 3

newton’s third law states

Answer 3

every action has an equal and opposite reaction

Question 4

mass is a measure of how much

Answer 4

matter is in an object

Question 5

weight is the effect of

Answer 5

gravitational field on a mass

Question 6

weight =

Answer 6

mass x gravitational field strength

Question 7

the gravitational field strength on earth is

Answer 7

10N/kg

Question 8

motion of body falling in uniform gravitational field

Answer 8

no air resistance only weight
as it falls it accelerates & increases speed & air resistance
resultant force down decreases
acceleration then decreases
they are equal and balance
no resultant force
no acceleration & terminal velocity is reached

Question 9

a vector has

Answer 9

magnitude and direction

Question 10

a scalar has

Answer 10

magnitude

Question 11

types of scalars are

Answer 11

distance
speed
time
energy

Question 12

types of vectors are

Answer 12

displacement
velocity
acceleration
force

Question 13

to find the resultant force u should?

Answer 13

add the forces together if they are in the same direction
subtract them if they are in the opposite direction

Question 14

friction is a force between 2 surfaces which

Answer 14

impedes motion and results in hearing

Question 15

the distance travelled between the driver realising they need to brake and pressing the brakes is called

Answer 15

the thinking distance

Question 16

factors which increase thinking distance include

Answer 16

greater speed
alcohol, tiredness or distractions
caffeine

Question 17

distance travelled between pressing the brakes and vehicle stopping is called

Answer 17

the braking distance

Question 18

factors which increase the braking distance include

Answer 18

greater speed or mass
poor road conditions
poor car conditions

Question 19

the stopping distance is

Answer 19

the sum of the thinking and braking distance

Question 20

average speed =

Answer 20

distance moved / time taken

Question 21

acceleration =

Answer 21

change in velocity / time taken

Question 22

force =

Answer 22

mass x acceleration

Question 23

weight = mass x gravitational field strength

Question 24

if a ticker timer produces 50 dots per second how many seconds did it take

Answer 24

50 : 1
5 : 1/10
5 : 0.1
= 0.1

Question 25

constant velocity is shown on a velocity time graph by

Answer 25

the horizontal part of the line

Question 26

the distance travelled is shown on a velocity time graph by

Answer 26

the area under the line

Question 27

the average velocity is shown on a velocity time graph by

Answer 27

the distance moved / the time taken

Question 28

why must the maximum speed of a train be higher than the average save

Answer 28

at some points the train is lower than the average meaning at some points it will me higher
max > higher

Question 29

acceleration on a velocity time graph is

Answer 29

rise / run

Question 30

distance on a velocity time graph is

Answer 30

the area under the line

Question 31

unbalanced force =

Answer 31

mass x acceleration