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Physics 2 > P2.3 & P2.4 Motions And Forces And Momentum, Energy, Work And Power > Flashcards

P2.3 & P2.4 Motions And Forces And Momentum, Energy, Work And Power Flashcards

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1
Q

A runner runs a 400m race on a track. What is his distance and displacement?

A

Distance: 400m
Displacement: 0m

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2
Q

On a distance-time graph, what does the gradient of the line show?

A

Speed

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3
Q

How do you calculate speed?

A

Distance(m) / time taken(s)

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4
Q

How do you calculate acceleration?

A

Change in velocity / time taken

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5
Q

What are the units for acceleration?

A

m/s2

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6
Q

Which of these values is not acceleration?

-2.3m/s2
100000000m/s2
1.5m/s2

A

All of them are acceleration

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7
Q

On a velocity-time graph, what does a straight line show?

A

Constant velocity

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8
Q

What is a vector quantity?

A

A quantity which has size and direction

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9
Q

What forces can act on an object moving in the air?

A

Drag
Thrust
Upthrust
Weight

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10
Q

When are forces balanced?

A

When the two forces acting against each other are the same

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11
Q

What factors affect acceleration?

A

Mass
Force
Friction

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12
Q

What is the formula for force?

A

Mass*acceleration

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13
Q

What are the units for force?

A

Newtons, N

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14
Q

What is terminal velocity?

A

The velocity an object reaches when it falls when it cannot accelerate any further

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15
Q

What are the units for gravitational field strength?

A

Newtons per kilogram, N/Kg

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16
Q

What is the formula for weight?

A

Mass*gravitational field strength

W=m*g

17
Q

What is thinking distance?

A

The distance that a car moves in the time that it takes a driver to react

18
Q

What is braking distance?

A

The distance a car travels between the driver braking and it stopping

19
Q

What is stopping distance?

A

Thinking distance*Braking distance

20
Q

What factors affect thinking distance?

A 
State of the driver eg
Alcohol
Caffeine
Drugs
Illness
21
Q

What factors affect braking distance?

A

Road condition
Tyre condition
Velocity
Mass

22
Q

What is the formula for momentum?

A

Mass*velocity

Kg m/s = Kg*m/s

23
Q

What are crumple zones on a car?

A

Crumple zones are parts of the front on a car that can crumple on impact, which absorbs some of the energy in a crash

24
Q

What is the formula for force relating to momentum?

A 
Force = Change in momentum / time taken
F= mv-mu / t
N= kgm/s / s
25
Q

What is the formula for work done?

A

Work done = force * distance moved
E= Fd
J= Nm

26
Q

What is the formula for power?

A 
Power = work done / time taken
P = E / t
W= J / s
27
Q

What is the formula for Gravitational potential energy?

A 
GPE = mass * GFS * vertical height
GPE= m * g * h
J = kg* N/kg * m
28
Q

What is the formula for kinetic energy?

A 
KE = 1/2 * mass * velocity2
KE = 1/2 * m * v2
J= 1/2 * kg * m/s2
29
Q

What Is conservation of energy?

A

The GPE is the same as KE when it is transferred

30
Q

How can you calculate distance from a velocity-time graph?

A

Velocity * time on the area underneath the line on the graph

31
Q

Why can a space probe travel without fuel?

A

There is no air in space to slow it down

32
Q

What is negative acceleration?

A

Slowing down

33
Q

What is the effect of a tired driver on stopping distance?

A

It increases

Physics 2 (4 decks)

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