P5:forces and motion

Question 1

whats a contact force

Answer 1

when objects physically touch

Question 2

whats a non contact force

Answer 2

when not touching

Question 3

whats a vector

Answer 3

a quantity that has magnitude and direction

Question 4

whats a scalar

Answer 4

quantity that only has magnitude

Question 5

whats a resultant force

Answer 5

overall force acting on a object

Question 6

give examples of scalars

Answer 6

distance, speed , mass, energy, temperature

Question 7

give examples of vectors

Answer 7

displacement, velocity, acceleration, force, momentum

Question 8

how is thinking distance affected

Answer 8

speed, distraction, alcohol, drugs and tiredness

Question 9

how is breaking distance affected

Answer 9

speed, condition of breaks, tires and roads, weather condition

Question 10

what does momentum(kgm/s) =

Answer 10

mass(kg) x velocity(m/s)

Question 11

what are all the EM emitted by

Answer 11

electrons

Question 12

how are EM waves produced

Answer 12

when electrons lose energy

Question 13

What does a higher frequency mean

Answer 13

more energy which means shorter wave lengths

Question 14

what does work done =

Answer 14

force x distance

Question 15

what does force = when it comes to elasticity

Answer 15

spring constant (n/m) x extension(m)

Question 16

what does acceleration =

Answer 16

change in velocity(m/s)/time

Question 17

what is suvat

Answer 17

s : displacement(m/s)
u : initial velocity
v : final velocity
a : acceleration(m/s^2)
t : time

Question 18

how do you calculate weight(n)

Answer 18

mass(kg) x gravitational field strength(n/kg)

Question 19

how do you calculate work done (j)

Answer 19

force(n) x distance (m)

Question 20

in springs what does force(N) equal to

Answer 20

spring constant (n/m) x extension (m)

Question 21

whats the practical for extension

Answer 21

measure the initial position of the spring
add weights onto spring and measure extension
repeat steps and plot onto graph
find gradient

Question 22

what errors can happen in the extension practical

Answer 22

ruler 0 mark is lined up to the bottom of the spring
you’re at eye level when measuring

Question 23

whats newtons first law of motion

Answer 23

when theres no resultantant force an objects motion is constant

Question 24

whats newtons 2nd law of motion

Answer 24

force(n) = mass(kg) x acceleration(m/s^2)

Question 25

what is the practical for acceleration

Answer 25

accelerate trolley with mass on string
use photogates to measure acceleration
change weight on string
draw a force - acceleration graph
straight line across origin which shows that f and a are directly proportional

Question 26

whats newtons 3rd law of motion

Answer 26

for every action there is an equal an opposite force

Question 27

in a closed system what happens to momentum before an event and after an event

Answer 27

total momentum before and event is equal to the total momentum after and event

Question 28

what happens in collisions

Answer 28

rebound
recoil
coupling