# Science

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 Author: MichKatie ID: 272545 Filename: Science Updated: 2014-05-04 07:51:53 Tags: Physics Folders: Science,Physics Description: science physics Show Answers:

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1. What is energy measured in?
J joules
2. What is Resultant force measured in?
N newtons
3. What is Mass measured in?
kg
4. What is acceleration measured in?
m/s2
5. What is energy velocity in?
m/s
6. What is time measured in?
s
7. What is weight measured in?
N newton
8. What is gravitational field strength measured in?
N/kg
9. What is force measured in?
N newton
10. What is spring constant measured in?
N/m
11. What is extension measured in?
m
12. What is work done measured in?
J joules
13. What is  force applied measured in?
N newton
14. What is distance measured in?
m
15. What is change in gravitational potential energy  measured in?
J joules
16. What is height measured in?
m
17. What is kinetic energy measured in?
J joules
18. What is speed measured in?
m/s
19. What is momentum measured in?
kg m/s
20. What is current measured in?
A amps
21. What is charge measured in?
C coulombs
22. What is potential difference measured in?
V volts
23. What is resistance measured in?
Ohms
24. What is power measured in?
W watts
25. What is the work done by an object moving 6m with a force of
500N?
500 X 6 = 3000J =3KJ
26. What is the force when something moved by 10m and 400J?

400/10=40N
27. How far has something moved with 300J of energy and 10N?
300/10=30m
28. What is 1Watt the same as?
1J/1s
29. What is the change in Gravitational positional energy of a
object with mass of 30 kg changing height by 2m?
30x2x10=600J
30. What is change in height of an object with mass and 200J of energy?
200J/(4x10)=50J
31. What is the mass of an object moving 15m with 450 J ofgravitational energy?
450/(15x10) = 3kg
32. Explain what happens to GPE and KE during each swing of a
pendulum?
While the pendulum1 is still it has maximum KE, when it is at its maximum height the GPE is at maximum and KE is zero. These keep transferring but eventually it will slow down and stop, this is because when the transfer takes place not all the energy transfers to KE or GPE because it is lost via thermal energy etc.
33. What is the kinetic energy when mass is 30kg and  and velocity is 3m/s?
0.5x30x32=135J
34. What is the velocity when there is 500J of kinetic energy
and a mass of 1000kg?
sqroot(2x500)/1000=1m/s
35. What is the mass of an object withvelocity 10m/s and kinetic energy of 50KJ?
(2x50,000)/102=1000kg
36. What is current?
Rate of flow of charge
37. What is momentum?
Describes how hard it would be to stop  a moving object.
38. What is the momentum of an object with a mass of 10kg and velocity 2m/s?
2x10= 20kgm/s
39. What is the mass of an object with momentum of 50kgm/s andvelocity 50m/s?
50/50=1kg
40. What is the velocity of an object with mass 50kg and momentum of 100kgm/s?
100/50=2m/s
41. How does the power of a device affect the rate at which it
transfers energy?
The more powerful the quicker the rate at which it transfers energy.
42. Which is more powerful A torch bulb or a mains filament lamp.
A mains filament lamp
43. Does a 1kw heater use the same amount of electric energy in1 hour as
A 2kw heater on for 30 mins
A 4kw heater on for 2 hours
A 2kw heater on for 30 mins
44. A 1000kg rail wagon moving at velocity of 50m/s on a track,
collides with a 1500kg stationary wagon. The two wagons move together after the
collision.

a) Calculate the velocity of the wagon before the collision

b) Calculate the velocity of the two wagons afterwards.
a) 1000x5=5000kgm/sb) After the collision the total momentum is 5000kgm/s5000/2500=2m/s
45. What is the final momentum after an explosion?00=(m1v1)+(m2v2)
• 0
• 0=(m1v1)+(m2v2)
46. A student of mass 40kg standing at rest on a skateboard of
mass 2kg jumps of the skateboard at a speed of 0.3m/s. Calculate the recoil velocity
of the skateboard.

(-2V)= (40x0.3)

v=12/-2

v=-6m/s
47. What is the potential difference when the current is 3amps
and the resistance of the wire is 4 ohms?
4x3=12V
48. What is the current when the resistance is 10 ohms and the
potential difference is 43 volts?
43/10=4.3amps
49. What is the resistance when the potential difference is 54
volts and the current is 9 amps?
54/9=6 ohms
50. What is current in a series circuit like?
The same all around.
51. What is voltage in a series circuit like?
The same all around.
52. What is voltage in a series circuit like?
Spread across or shared out between components
53. What is voltage in a series circuit like?
The same all around.
54. What is current in a series circuit like?
Spread across or shared out between components
55. What is an ohmic device?
• Something that follows ohms law V=IR or if you increase voltage
• current increases
56. What do excited electrons have?
More energy.
57. Name  four non-ohmic
devices.
Filament bulb

Diode

Light dependent resistor (LDR)

Thermistor
58. What are diodes, LEDs AND LDRs made of?
Semi conductors
59. What happens as current increases in a filament bulb?
• Thin wire heats up, as it becomes hotter its resistance
• increase, so it needs a larger p.d. to make the current increase in a small
• amount.
60. Does it affect resistance of a filament if p.d. is positive
or negative?
No it is the same.
61. Give
an example of a diode
LED.

62. What happens as light shines on a light dependant resistor
becomes brighter?

Resistance increases so current increases
63. Name two things LDRs are used for?
Smoke alarms

Security lighting.
64. How does a smoke alarm work?
• Smoke
• stops light getting to the LDR and the change in current switches oh the alarm
65. How does a security light work?
• As it gets darker the resistance increases , the
• change in current turns on the light
66. What does heating a thermistor do?

.
• Makes the resistance decrease so the current though the
• thermistor increases (Heat can make resistance increase or decrease)
67. Name two things thermistors are used for?
Electric thermometers

Thermostats
68. How does an electric thermometer work?
69. Temperature is measured by the resistance
70. Is there flow in the negative direction in a diode?
No only in the positive direction past a certain point e.g.0.6 volts(No increase until past this point)
71. How do you calculate the total resistance over a circuit?
R1+R2+R3=RTotal
72. Calculate the current when p.d. is 6v and resistance is 4ohms.
6/4=1.5A
73. Calculate resistance when p.d. is 6v and current is 0.5 A.
6/0.5=12 ohms
74. Calculate the p.d. when current is 10A and resistance is 2.5ohms.
10x2.5=25 V
75. How long
will it take a car to travel 300m at 20m/s?
• 300x20=6000s
• =100 mins
76. How far can
a car travel going 100m/s in 60 seconds?
100x 60=600m
77. What is the
difference between Velocity and Speed?
Speed is a scalar quantity which can get biggerVelocity has direction (speed in a given direction)
78. What is the
equation for working out speed, distance or time?
79. Distance = Speed x Time

80. How long will it take for a car to travel 150m at 3m/s?
• 150/3=50 seconds
81. How fast is
a car travelling if it travels 100m in 20 seconds?
100/20= 5m/s
82. How would
you convert mins to secs?
x60
83. What is the
difference between average speed and instantaneous speed.
• Average speed is the whole distance over the whole time or over a
• particular time.Instantaneous is when the speed over a certain distance and the time it
• took to travel there e.g. at a particular point
84. What is thestopping distance at 20mph?
40ft
85. What is the stopping distance at 80mph?
400ft
86. What is the relationship between: Force and Mass
Force and acceleration are Proportional
87. How do youwork out the distance something has travelled on a velocity graph?
Work out the area under the graph by splitting it up into shapes.
88. Which axis is time always in?
X
89. How do you work out stopping distance?
Thinking distance + Braking distance
90. What is the point of the centre of gravity must pass for an object to fall over?
the base
91. How fast is
a car travelling when it travels 100m in 5 seconds?
100/5=20m/s
92. Acceleration of a car mass 1000kg force 20000N?
20000/1000=20m/s2
93. Acceleration of a car mass 1000kg force 20000N?
20000/1000=20m/s2
94. What affectsboth braking and thinking distance?
Speed
95. What is the stopping distance at 60mph?
240ft
96. What is weight?
A force that acts downwards on an object dueto gravitational pull
97. What is the
relationship between the forces of a stationary object?
They are balanced
98. What is the
equation for working out Mass, Weight and Gravitational field strength?
• Weight = Mass x
• Gravitational field strength.
99. What is the
stopping distance at 50mph?
175ft
100. What isterminal velocity?
When the forces on an object are equal
101. What is the force needed to accelerate a bus
4000kg by 2m/s2?
4000x2= 8000N
102. What are the
two situations that can occur when forces are balanced?
103. When an object is travelling at a constant speedWhen an object is at rest(stopped)
104. What is the
stopping distance at 30mph?
75ft
105. Give three
things that affect thinking distance.
• If the driver is under the influence of drugs or alcohol etc. make it
• slowerIf the driver has had caffeine which could make it fasterIf there is a distraction in the car making it slower
106. What is the
relationship between distance and velocity?
• the greater the
• velocity the greater the  distance

107. How far can a car travel in 60 seconds at 10m/s?
• 60x10=600m

108. What is the stopping distance at 40mph?

120ft

109. What is Braking distance?

the distance it takes for the car to physically stop.

110. Give three things that affect braking distance.
• If the road is wet or icy
• Mass of the car if it is heavier it will be harder to stop
• The condition of the car e.g. worn brakes

• Mass of a car force 15 KN at 10 m/S2?

15000/10=1500KG

• What is thinking distance?

the distance you travel before thinking you need to stop

• How would you convert minutes to hours?

/60

111. What is 1N the same as?

1 kgm/s2

112. How does deceleration differ to acceleration?

It is the same with a -

113. What is up thrust?

The Upward force

114. How would you convert hours to minutes?

x60

• What is the stopping distance at 70mph?

315ft

115. What is drag?

The force acting in the opposite direction to the motion of a moving object

116. How would you convert seconds to minutes?

/60

117. On a
velocity graph what direction is object C moving in?
It is not moving
118. On a velocity graph what direction is object B moving in?
• Back to the start
119. On a velocity graph what direction is object A moving in?
• Away from the start

120. Which is moving faster?
• A

121. Label 1, 2 and 3 with what the force is?
• 1. Push
• 2. Weight
• 3. Friction

122. Describe the speed graph.
• between a and b the object is accelerating
• between b and c the object is moving at a constant speed.
• between c and d the object is decelerating

123. A stone weighing 20N drops with 4N of drag and 2N of up thrust:
a)What is the total upward force
b) the resultant force
c) the direction it is travelling in

• a) 4N+2N=6N
• b) 20N-6N=14N
• c) Downwards
124. Describe the velocity graph
• between a and b the object is moving away from the start
• between b and c it is stationary
• between c and d it is returning to the start

125. What is A?

Switch

126. What is B?

Thermal resistor

127. What is C?

Voltmeter

128. What is D?

Ammeter

129. What is E?

Cell

130. What is F?

Battery

131. What is G?

Motor

132.  What is H?

Resistor

133. What is I?

Bulb

134. What is A?
Brass disc

135. What is B?

Ebonite stopper

136. What is C?

Brass rod

137. What is D?

Gold leaves

138. What is E?

Tin foil

139. What is F?

Wooden base

140. Why do the gold leaves rise ?

because the rod is negatively charged and this wants to go back  to the ground so it repels this down the brass rod into the leaves, which the repel each other causing them to rise/move apart.

141.  What is a  resistance graph for a filament bulb like?
142. What does a resistance graph for a diode look like?

143. What is this?

LED

144. What is this?

LDR

145. What is this?
• Thermistor

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