Topic 4 Flashcards
1
Q
thinking distance =
A
reaction time and how fast you are going
2
Q
breaking distance
A
how fast, the mass, brakes, grip
3
Q
the amount you slide depends on
A
friction
4
Q
momentum is always
A
conserved
5
Q
momentum =
A
mass x velocity
6
Q
momentum is in
A
kgm’s
7
Q
force=
A
change in momentum/ time
8
Q
cars protective features include
A
crumple zones, seat belts, air bags
9
Q
works in the same way
A
bubble wrap
10
Q
work done=
A
force X distance moved in the direction of the force
11
Q
power=
A
work done / time taken
12
Q
power is in watts or
A
joules/ sec
13
Q
kinetic energy=
A
0.5 x mass x velocity squared
14
Q
stopping distances increase alarmingly with
A
extra speed
15
Q
GPE=
A
mgh
16
Q
energy can never be created nor destroyed,
A
only transferred from one form to the other
17
Q
kinetic energy gained=
A
gpe lost
18
Q
most energy transfers involve some losses often such as
A
heat
