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BMAT > Physics 3 -Forces/energy > Flashcards

Physics 3 -Forces/energy Flashcards

1
Q

what does velocity take into consideration that speed doesnt

A

velocity = direction

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2
Q

Distance in a particular distance is called what?

A

Displacement

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3
Q

Average speed (constant Acceleration) =

A 
2
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4
Q

Gradient on a Distance/time graph =

A

Velocity

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5
Q

Downhill sections on a distance/time graph is

A

Going back to original point

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6
Q

Acceleration =

A

t

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7
Q

On velocity-time graph, flat sections represent what?

Whereas flat sections on distance/time graph represent what?

A

steady speed

Not moving

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8
Q

Area under a velocity/time graph is what

A

Distance

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9
Q

Gravitational force on earth is =

A

10m/s^2

10 N/Kg

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10
Q

Gravity gives an object …. and is different from….

A

weight

mass

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11
Q

Mass is the same where

A

Anywhere in the universe

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12
Q

Weight =

A

mass x gravitational force

m x g

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13
Q

If the resultant force is zero to a car, what will happen?

A

wont move

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14
Q

if the resultant force is zero to a moving car, what will happen

A

No change in velocity

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15
Q

A non zero resultant force will always end up producing what

A

Acceleration

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16
Q

acceleration =

A

F x a

17
Q

what is newtons 2nd law

A

F=ma

18
Q

what is newtons 3rd law

A

When two objects interact, the forces they exert on each other are equal and opposite

19
Q

in terms of friction, the larger the area, the more what

A

Drag

20
Q

What two forces are equal at terminal velocity

A

Resistance force (drag)

Accelerating force (weight)

21
Q

stopping distance consists of what two things

A

Braking distance

Thinking distance

22
Q

Momentum =

A

Mass x velocity

Kg) x (m/s

23
Q

Momentum units =

A

kg m/s

24
Q

Momentum before =

A

Momentum after

25
Q

Force (momentum equation) =

A 
        time
26
Q

When a force moves an object moves, what is transferred and what is done

A

energy transferred

work is done

27
Q

Work Done =

A

Force x Distance moved in the direction of the force

E = F x D

28
Q

Power =

A 
     time
29
Q

Power is measured in

A

Watts (J/s)

30
Q

Kinetic energy depends on both what

A

Mass + Speed

31
Q

Ke =

A

0.5 x Mass x Speed^2

1/2MV^2

32
Q

Whats the unit of Ke

A

Joules

33
Q

If you double the speed, what happens to Ke

A

quadrouples

34
Q

If you double the mass, what happens to Ke

A

Doubles

35
Q

If you go twice as fast, what happens to stopping distance?

A

Quadrouples

36
Q

If you have twice the mass, what happens to stopping distance

A

Doubles

37
Q

Gravitaional Potential Energy =

A

Mass x g x height

38
Q

falling objects convert GPE into what? What is this negating

A

KE

GPE can be dissipated into heat (due to air resistance)

BMAT (21 decks)

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