Mechanics 2 Flashcards

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1
Q

When may suvat be used?

A

when the acceleration is constant

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2
Q

What is Newton’s first law of motion?

A

an object remains in uniform motion unless acted on by a resultant force

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3
Q

What is meant by uniform motion?

A

constant velocity

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4
Q

What is Newton’s 2nd law of motion?

A

the acceleration of an object is directly proportional to the resultant force that acts on it

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5
Q

What is Newton’s third law of motion?

A

if object A exerts a force on object B, then object B exerts an equal and opposite force on object A

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6
Q

What is meant by ‘weightlessness’?

A

the only force acting on an object is its weight

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7
Q

What is meant by freefall?

A

When the only force acting on an object is its weight, and it accelerates at g

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8
Q

What path do projectiles follow and why?

A
  • parabolic

- due to constant horizontal velocity and constant vertical acceleration

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9
Q

Define terminal velocity

A

the velocity at which driving forces match the frictional forces

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10
Q

What is the relationship between terminal velocity and drag?

A
  • drag is directly proportional to terminal velocity squared

- drag = k(v)^2

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11
Q

Why is drag directly proportional to terminal velocity squared?

A
  • when v doubles, there are twice as any collision with air molecules
  • each collision is twice as hard
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12
Q

What does k relate to in the equation drag = k(v)^2?

A

related to the surface area

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13
Q

For a falling object at terminal velocity, what does drag equal?

A

the weight of the object

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14
Q

What happens to drag as speed increases?

A

drag also increases

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