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Mechanics > Force, Motion, Energy And Pressure > Flashcards

Force, Motion, Energy And Pressure Flashcards

1
Q

The x axis on a speed/time graph is…

A

Distance (d)

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2
Q

Time is measured in…

A

Seconds, s

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3
Q

What is the formula for velocity, v?

A

v = Δd / Δ t

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4
Q

Acceleration is measured in what?

A

ms-2

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5
Q

Velocity is measured in…

A

ms-1

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6
Q

The gradient of a distance/time graph is…

A

Speed (v)

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7
Q

Gradient is calculated on a graph by…

A

Rise / run

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8
Q

What is another word that means negative acceleration?

A

Deceleration

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9
Q

What does the gradient on a speed/time graph show?

A

Acceleration

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10
Q

What are forces measured in?

A

Newtons, N

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11
Q

What do we know about the forces on an object moving at a constant speed?

A

They are balanced

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12
Q

If an object is accelerating the forces on that object must be what?

A

Unbalanced

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13
Q

What units are used to measure mass?

A

Kilograms, kg

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14
Q

What do we call the force acting downward on an object?

A

Weight or weight force

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15
Q

What is the name given to the force that keeps a boat afloat?

A

Upthrust

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16
Q

What force slows objects down?

A

Friction force

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17
Q

What is the name of the force which moves an object forward?

A

Thrust

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18
Q

What is Gravity on Earth equal to?

A

10 ms-2

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19
Q

What is Work measured in?

A

Joules, J

20
Q

Define Work.

A

When a force moves or changes the movement of an object.

21
Q

What is the formula to calculate Work?

A

Force x distance, Fd

22
Q

Define energy

A

The capacity to do work

23
Q

What form of energy does a moving object have?

A

Kinetic Energy

24
Q

What is the energy gained by an object as it is lifted?

A

Gravitational Potential Energy

25
Q

What is the EK (Kinetic energy) of an object just before it hits the ground equal to?

A

The Gravitational Potential it started with, EP

26
Q

What is the formula to calculate EK (Kinetic energy)?

A

½mv2

27
Q

What is the formula to calculate the change in EP (Gravitational Potential)?

A

m g Δh

28
Q

What happens to Kinetic energy if the speed doubles?

A

It increases by 4 times

29
Q

What happens to stopping distances as speed increases?

A

It increases

30
Q

Complete this statement “Energy is never lost or gained it is only…”

A

Transferred / Transformed

31
Q

What is the unit of Power?

A

Watt, W or Js-1

32
Q

What is the formula for Power?

A

W/t

33
Q

What happens to pressure if the force remains the same but the area increases?

A

The pressure decreases

34
Q

What happens to pressure if the force remains the same but the area decreases?

A

The pressure increases

35
Q

What happens to pressure if the force increases but the area remains the same?

A

The pressure increases

36
Q

What happens to pressure if the force decreases but the area remains the same?

A

The pressure decreases

37
Q

How do snow shoes and skis keep the wearer on top of the snow?

A

The force is spread over a larger/greater area

38
Q

How would you describe the pressure at the point of a needles as it is forced through fabric? Why?

A

Enormous/great/large. The area of the point is very small so the force creates greater pressure.

39
Q

Why is it easy to pull Drawing pins into a surface?

A

The area of point is very small so the pressure on that point is greater.

40
Q

Why do camels have such large feet?

A

Greater surface area spreads the force making the pressure less so they don’t sink into the sand.

41
Q

Define Pressure

A

The amount of force an object exerts over and area.

42
Q

What is the point at which the weight force down equals the air resistance force up?

A

Terminal velocity.

43
Q

What is a Pascal, Pa?

A

1 Nm-2

44
Q

What does a horizontal line on a distance/time graph tell us about the object?

A

It is stationary/stopped

45
Q

What does an upward curve on a distance/time graph tell us about the object?

A

It is accelerating.

46
Q

What is happening to an object when the curve on a distance/time graph begins to flatten?

A

It is decelerating.

47
Q

What does a horizontal line mean on a speed/time graph?

A

The object is traveling at a constant speed.

Mechanics (2 decks)

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