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OCR Physics > Corrections > Flashcards

Corrections Flashcards

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0
Q

This is the formula for Kinetic Energy:

E = 1/2mv

True or False?

A

False. The equation for Kinetic Energy is E = 1/2mv^2

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1
Q

What’s wrong with this equation:

KE = mv^2

A

The mass is not divided by 2.

It should be KE = 1/2mv^2

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2
Q

List 4 factors decreasing road accidents

A
  • seat belts
  • airbags
  • safer cars
  • crumple zones, or;
  • side-impact bars
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3
Q

Seat belts prevent the…

A

Driver from hitting the steering wheel or windscreen

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4
Q

How do you find the torque of a couple?

A

One of the forces times the PERPENDICULAR distance between the forces

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5
Q

Why does strain have no unit?

A

It’s a ratio of two lengths

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6
Q

When acceleration is constant…

A

Use the constant acceleration equations

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8
Q

Define Ultimate Tensile Strength

A

Ultimate Tensile Strength is the breaking stress for material

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9
Q

Force F acts on an object at angle Θ, an equation for this is W = FxCosΘ. Why not just W = Fx?

A

The COMPONENT of the force in the direction of the force is FCosΘ

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11
Q

Force F acts on an object at angle Θ, give an equation for the work done, W

A

W = FxCosΘ

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12
Q

What does the gradient of a displacement time graph represent?

A

Velocity

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13
Q

A couple…

A

Is a pair of equal and parallel but opposite forces

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14
Q

What is Young Modulus defined as?

A

Stress per strain, as long as elastic limit isn’t reached

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15
Q

Define velocity

A

Velocity is the rate of change of displacement

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16
Q

What are the conditions for equilibrium?

A
  • all forces on the object equal zero

* net moment about any point is zero

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17
Q

Seat belts decrease…

A

The impact force on the driver

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18
Q

Airbags deflate…

A

Quickly to prevent whiplash

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19
Q

What is a Brittle material?

A

A Brittle material breaks at its elastic limit, it has no plastic region

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20
Q

Couples tend to produce…

A

Rotation

21
Q

Define the Joule

A

The work done when a force of 1N moves 1m in the direction of the net force

21
Q

What is the equation for Kinetic Energy?

A

KE = 1/2mv^2

21
Q

Other than deflating quickly to prevent whiplash, what other safety feature do Airbags feature?

A

Much wider area of bag reduces the pressure

22
Q

What is the constant acceleration equation without s?

A

v = u + at

23
Q

What is the constant acceleration equation without a?

A

s = (u+v)/2 x t

24
Q

What is the constant acceleration equation without v?

A

s = ut + 1/2at^2

25
Q

What is the constant acceleration equation without u?

A

s = vt - 1/2at^2

26
Q

What is the constant acceleration equation without t?

A

v^2 = u^2 + 2as

27
Q

An object travels two paths, one with and one without a slope, both have the same resistive force. Which will travel the furthest?

A

Journey down the slope, as there is a component of weight acting down. The net force is less, deceleration is smaller.

28
Q

What type of waves do satellite’s use?

A

Radio or Microwave

29
Q

How do you determine the distance between a GPS device and satellite?

A

Delay time x c

30
Q

What do satellites use to locate GPS devices?

A

Trilateration, using spheres

31
Q

What is delay time?

A

The time taken for a signal to travel from the satellite to a receiving GPS device

32
Q

What is the relationship between drag and speed?

A

Drag is proportional to speed^2

33
Q

How to do you find stress?

A

force/area

34
Q

How do you find strain?

A

Length/extension

35
Q

What is the relationship between Young Modulus, strain and stress?

A

Young modulus = stress/strain

36
Q

What is Young Modulus measured in?

A

Pascals (Pa/Nm^-2)

37
Q

True or false: Kinetic energy is converted into heat energy

A

True

38
Q

True or false: gravitational potential energy is converted into heat energy/loss

A

False. GPE is converted to KE, then KE is converted to heat energy/loss

39
Q

Define work done

A

Force by distance moved in the direction of the force

40
Q

What does a straight gradient on a distance/time graph represent?

A

Constant speed

41
Q

True or false: Kinetic energy is converted into heat energy

A

True

42
Q

True or false: gravitational potential energy is converted into heat energy/loss

A

False. GPE is converted to KE, then KE is converted to heat energy/loss

43
Q

Define work done

A

Force by distance moved in the direction of the force

44
Q

What does a straight gradient on a distance/time graph represent?

A

Constant speed

OCR Physics (2 decks)

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