Mechanics

Question 1

SUVAT

Answer 1

v=u+at
s=(u+v)/2 t
v^2=u^2+2sa
s=ut+0.5at^2

Question 2

velocity

Answer 2

the rate of change of displacement

Question 3

acceleration

Answer 3

the rate of change of velocity

Question 4

displacement

Answer 4

average velocity*time

Question 5

change in velocity

Answer 5

acceleration*time

Question 6

terminal velocity

Answer 6

forces are balanced (no resultant force)
weight never changes
surface area presented + velocity affect it

Question 7

relative velocity

Answer 7

speed of an object from a perspective

Question 8

fundamental forces

Answer 8

nuclear strong force
nuclear weak force
gravity (weakest)
electromagnetic (all others observed)

Question 9

newton’s 3rd law

Answer 9

all forces are interactions between objects
(same magnitude of force in opposite directions
same type of force)

Question 10

Newton’s first law

Answer 10

if there is no resultant force, there will not be a change in velocity

Question 11

Newton’s second law

Answer 11

F=ma

Question 12

linear momentum

Answer 12

=m*v (kgms^-1)

conservation of momentum

Question 13

impulse

Answer 13

sudden change in momentum for an object/ the force on an object and the time it is applied (kgms^-1)
Impulse=dP=forcetime
=mdv

Question 14

Work done

Answer 14

force*distance
FSCosΘ
(if energy gained, positive and vice versa)

Question 15

Power

Answer 15

work done in 1 s

dW/dt=F(ds/t) P=Fv

Question 16

efficiency

Answer 16

useful work done/input energy=useful output power/input power

Question 17

circular motion

Answer 17

centripetal force

a=v^2/r=4π^2r/T^2