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GCSE PPaper2 > Forces (5) - Pt3 > Flashcards

Forces (5) - Pt3 Flashcards

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1
Q

What’s the speed of a:

  • car
  • train
  • plane
A
  • car: 25m/s
  • train: 55m/s
  • plane 259m/s
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2
Q

What’s the speed of sound. And what can effect its speed?

A

330m/s in air

It can change depending on what the sound waves are travel traveling through

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3
Q

What effects the speed of a person?

A
  • fitness and age

- terrain they’re on

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4
Q

What can effect the speed of wind?

A
  • temperature
  • atmospheric pressure
  • large structures (eg. Forests reduce the speed of the air traveling through them)
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5
Q

What’s acceleration?

A

The change in velocity in a certain amount of time

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6
Q

How would you calculate the average acceleration of an object?

A

Acceleration (m/s*2) = change in velocity (m/s) / time (s)

a= change in v/ t

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7
Q

What’s deceleration?

A

Negative acceleration (the change in velocity is negative)

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8
Q

What’s uniform acceleration?

A

Constant acceleration

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9
Q

What’s the equation the links velocity, acceleration and distance?

A 
Final velocity (m/s)*2 - initial velocity (m/s)*2 = 2 x acceleration (m/s*2) x distance (m)
V*2-u*2 = 2as
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10
Q

What does the gradient of a distance-time graph mean?

A

Speed

The steeper the graph the faster it’s going

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11
Q

What does a flat section on a distance-time graph mean?

A

Where it’s stationary

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12
Q

What do the straight uphill section on a distance-time graph mean?

A

It’s traveling at a steady speed

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13
Q

What does a curve on a distance-time graph mean?

A

Acceleration (a steeping curve means it’s speeding up) or deceleration (a levelling of curve means it’s slowing down)
(Draw a tangent to a point of the curve if you want to find the speed)

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14
Q

What does the gradient of a velocity-time graph mean?

A

The gradient=acceleration

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15
Q

What does a flat section on a velocity-time graph mean?

A

Represent traveling at a steady speed

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16
Q

What does the steepness of a velocity-time graph mean?

A
  • the steeper the graph the greater the acceleration or deceleration
  • uphill sections are constant acceleration
  • downhill sections are constant deceleration
17
Q

What does a curve on a velocity-time graph mean?

A

Changing acceleration

18
Q

What does the area under a a velocity-time graph mean?

A

The distance travelled

19
Q

If an object has no force propelling it along what will happen?

A
  • It will always slow down and stop because of friction
  • Friction always acts in the opposite direction to movement
  • To be at a steady speed the driving force need to equal the fictional forces
20
Q

When do you get friction?

A
  • between 2 surfaces in contact

- when an object passes through a fluid (drag)

21
Q

What’s drag? And give an example of a type of drag?

A
  • it’s the resistance you get in a fluid (a gas or liquid)
  • eg. Air resistance
  • drag increase as speed increses
22
Q

How can you reduce drag?

A
  • By keeping the shape streamlined

- this allows the fluid to flow easily across it

23
Q

Explain how object’s falling through fluids reach a terminal?

A
  • at the start the force of gravity is a lot more than the frictional Force, so it accelerates
  • as the speed increases friction builds up reducing the acceleration
  • until the frictional forces are equal to the accelerating force (so the resultant force is 0)
  • it will have reached terminal velocity and will fall at a steady speed
24
Q

What 2 things affect terminal velocity?

A

Shape and area

25
Q

Using the example of a skydiver explain how the frictional force depends on the shape and area?

A
  • without the parachute open he has a small area. He reaches a very fast terminal velocity
  • but with the parachute open there’s a lot more area resistance. So he has a lot slower terminal velocity
26
Q

What’s Newton’s first law of motion?

A
  • If the resultant force on a stationary object is 0, the object will remain stationary.
  • If the resultant force on a moving object is 0, it’ll just carry on moving at the same velocity
27
Q

If the resultant force isn’t 0 what happens?

A

Acceleration (or deceleration) in the direction of the force

28
Q

What different ways could they refer to “acceleration” (or deceleration) as?

A
  1. Starting
  2. Stopping
  3. Speeding up
  4. Slowing down
  5. Changing directions
  6. (On a free body diagram the arrows will be unequal)
29
Q

What’s the relationship between resultant force and acceleration?

A

They’re directly proportional

30
Q

What’s the relationship Between acceleration and mass (for a fixed resultant force)?

A

Acceleration is inversely proportional to mass

GCSE PPaper2 (10 decks)

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