8+9: Space, Time and Motion

Question 1

example of vectors

out of: mass, displacemt, force, temperature,velocity time, length, acceleration, speed, energy, momentum

Answer 1

displacement, force, velocity, acceleration, momentum

Question 2

suvat equation u,v,t,a

Answer 2

v=u+at

Question 3

suvat equation s,u,v,t

Answer 3

s= t x (u+v) x 1/2

Question 4

suvat equation s,u,t,a

Answer 4

s= ut + (1/2x at^2)

Question 5

suvat equation s,v,t,a

Answer 5

s=vt - (1/2x at^2)

Question 6

suvat equation v,u,a,s

Answer 6

v^2 = u^2 +2as

Question 7

what do you need to make sure when something is travelling downwards (either a, u, v, s)

Answer 7

if it’s downwards it could be a negative

Question 8

question where something is thrown from the top of a cliff
you calculate the vertical distance
what equation do you use to find the horizontal

Answer 8

s=d/t

Question 9

a displacement/time graph that shows acceleration will always be

Answer 9

curved

Question 10

a displacement/time graph with constant velocity

Answer 10

will be a straight line

Question 11

acceleration=

Answer 11

(v-u)/t

Question 12

how to find the distance traveled on a speed/time graph

Answer 12

area under graph

Question 13

advantages of data loggers

Answer 13

more accurate data- cancels out human reaction time
higher sampling rate (ten readings a second)
data displayed in real time

Question 14

work

Answer 14

force x distance

Question 15

work measured in

Answer 15

Joules

It is energy that has been changed from one form to another

Question 16

Power (rate of doing work) x3

Answer 16

P =work/time (P= FxD/t)
P =Force x Velocity
P= E/t

Question 17

watt units

Answer 17

Js^-1

Question 18

if calculaing lifting work dont forget

Answer 18

to times by gravity

Question 19

efficiency=

Answer 19

useful energy output / energy input

Question 20

Kinetic energy=

Answer 20

1/2mv^2

Question 21

Gravitational potential energy

Answer 21

mass x gravity x height

mgh

Question 22

Elastic potential energy

Answer 22

1/2ke^2
k- stiffness constant
e- extension

Question 23

if you need to find something but you dont have enough parts (you have height and gravity) what two equations can you rearange

Answer 23

mgh=1/2mv^2

the masses can then be cancelles

Question 24

How to improve measuments

Answer 24

Repeat measurement, take an average (removes random error)
higher precision apparatus (cuts random error)
Calibration- compare value to a known value

Question 25

units for kinetic energy

Answer 25

kgm^2 s^-2

Question 26

units for acceleration other than ms-2

Answer 26

Nkg-1

Question 27

if there is a squared in an equation

Answer 27

the graph will be curved

Question 28

work done=

Answer 28

force x distance

Question 29

force=

Answer 29

ma

Work / distance

Question 30

why can you onlly see some wavelengths after diffraction

Answer 30

because destructive interference occurs

it can only be one wavelength or the other

Question 31

Transverse:

Answer 31

oscillations/vibrations in direction perpendicular

to direction of movement of wave (1);

Question 32

Longitudinal:

Answer 32

oscillations/vibrations in direction parallel to

direction of movement of wave (1)

Question 33

which can be measured in J

W= Fs or P= Fv

Answer 33

W

Question 34

F, W, P, V^2, S

which are vectors

Answer 34

S and F

Question 35

units for force

Answer 35

kgms-2

Question 36

units for energy, Joules

Answer 36

Nm

J

Question 37

prefix of wavelength of light

Answer 37

10^-6

Question 38

prefix weight of a person in N

Answer 38

10^3

Question 39

why the colour of the incident light and increasing its intensity causes different amounts of electrons to be emitted (evidence of quantum behaviour)

Answer 39

energy needed liberate electrons
higher f (>L) means higher energy photons
light provides energy in packets
one photon emits one electron
same wavelengths only are energetic enough

Question 40

w=Fs

units

Answer 40

Joules