You can determine the relationship between force, mass and acceleration by what?
varying the masses added to a trolley and measuring the time it takes to pass between too light gates that are a small distance apart
1 of 64
Newton's third law relates to what?
bodies in equilibrium and can be applied to collisions when considering the conservation of momentum
2 of 64
What does Newton's third law state?
that for every action there is an equal and opposite reaction
3 of 64
The action force and the reaction force act on what?
different bodies
4 of 64
State a reason why a man and a wall would be in equilibrium
because the forces in the system are balanced and there is no overall force in any direction
5 of 64
What is human reaction time?
is the time between a stimulus occuring and a response
6 of 64
What is reaction time related to?
it is related to how quickly the human brain can process information and react to it
7 of 64
State how long it takes a typical person to react to a stimulus
between 0.20 and 0.25 seconds
8 of 64
How can you determine human reaction time?
by using the ruler drop test
9 of 64
How do you calculate reaction time?:
square root of 2x distance ruler falls divided by gravitational field strength
10 of 64
What do drivers have to react to ?
changes in the traffic when driving. This may involve reacting to traffic lights changing colour, traffic slowing on a motorway or avoiding people or animals that may have walked in front of the vechile
11 of 64
State what the reaction time of humans may be affected by
tiredness
12 of 64
State what the reaction time of humans may be affected by
alcohol and drugs
13 of 64
State what the reaction time of humans may be affected by
distractions
14 of 64
State what the reaction time of humans may be affected by
age
15 of 64
What is stopping distance?
is the total distance over which a vehicle comes to rest
16 of 64
What is thinking distance?
the distance the car travels while the driver reacts to the danger and applies the brakes
17 of 64
What is braking distance?
the distance the car travels while it is slowing down, once the brakes have been applied
18 of 64
How do you calculate the stopping distance?
thinking distance+ breaking distance
19 of 64
Thinking distance increases when?
the driver's reaction time increases
20 of 64
State a reason why a driver's reaction time increases
the driver being tired
21 of 64
State a reason why a driver's reaction time increases
the driver being distracted
22 of 64
State a reason why a driver's reaction time increases
the driver having taken alcohol or drugs
23 of 64
State why a driver's breaking distance may increase
the amount of friction between the tyres and the road decreases such as when the road is icy or wet
24 of 64
State why a driver's breaking distance may increase
the brakes are worn
25 of 64
State why a driver's breaking distance may increase
the tyres are worn
26 of 64
State why a driver's breaking distance may increase
the mass of the car is bigger
27 of 64
Energy can be stored in what?
different ways and can be transferred from one energy store to another
28 of 64
State one of the eight main energy stores
chemical
29 of 64
State one of the eight main energy stores
kinetic
30 of 64
State one of the eight main energy stores
gravitational potential
31 of 64
State one of the eight main energy stores
elastic
32 of 64
State one of the eight main energy stores
thermal
33 of 64
State one of the eight main energy stores
magnetic
34 of 64
State one of the eight main energy stores
electrostatic
35 of 64
State one of the eight main energy stores
nuclear
36 of 64
State an example of chemical energy store
fuel
37 of 64
State an example of chemical energy store
food
38 of 64
State an example of chemical energy store
battery
39 of 64
State an example of kinetic energy store
moving objects
40 of 64
State an example of gravitational potential energy store
raised mass
41 of 64
State an example of elastic energy store
stretched spring
42 of 64
State an example of thermal energy store
hot object
43 of 64
State an example of magnetic energy store
two magnets
44 of 64
State an example of electrostatic energy store
two charges
45 of 64
State an example of nuclear energy store
radioactive decay
46 of 64
State one way energy can be transferred from one store to another
mechanically- by a force moving through a distance
47 of 64
State one way energy can be transferred from one store to another
electrically- by the use of electric current
48 of 64
State one way energy can be transferred from one store to another
thermally- because of a difference in temperature
49 of 64
State one way energy can be transferred from one store to another
radiation- by waves such as electromagnetic or sound
50 of 64
Some energy will be what?
usefully transferred and some will be wasted or dissipated
51 of 64
Mechanical processes become wasteful when?
they lead to a rise in the temperature of the surroundings through heating
52 of 64
When there are energy transfers in a closed system, there is what?
no net change to the total energy of the system
53 of 64
A closed system is where what?
energy can flow in or out of the system, but there is no transfer of mass
54 of 64
The efficiency of a device is what?
a measure of how much useful energy it transfers
55 of 64
State what the rate at which thermal energy is transferred through a wall of a house depends on
the difference in temperature between the warmer interior and the colder exterior
56 of 64
State what the rate at which thermal energy is transferred through a wall of a house depends on
the thickness of the walls
57 of 64
State what the rate at which thermal energy is transferred through a wall of a house depends on
the material that the walls are made from
58 of 64
All machines waste what?
some of the energy they transfer. Most machines waste energy as heat heat energy
59 of 64
The efficiency of a machine is a way of saying what?
how good it is at transferring energy into useful forms
60 of 64
The higher the efficiency, the better the machine is at what?
transferring energy to useful forms
61 of 64
Unwanted energy transfers can be reduced by what?
thermal insulation and lubrication
62 of 64
What does lubrication involve?
placing a liquid between moving parts to reduce friction and this leads to less energy being wasted as thermal energy to the surroundings
63 of 64
A material with a high thermal conductivity is what?
a better conductor of energy than one with a lower thermal conductivity
64 of 64
Other cards in this set
Card 2
Front
Newton's third law relates to what?
Back
bodies in equilibrium and can be applied to collisions when considering the conservation of momentum
Card 3
Front
What does Newton's third law state?
Back
Card 4
Front
The action force and the reaction force act on what?
Back
Card 5
Front
State a reason why a man and a wall would be in equilibrium
Comments
No comments have yet been made