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Physics: Kinematics > Physics Test 3- Dynamics > Flashcards

Physics Test 3- Dynamics Flashcards

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1
Q

What is Newton’s 1st Law of Motion?

A

Inertia; Objects at rest are no different than objects moving at a constant speed

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2
Q

What is Newton’s 2nd Law of Motion?

A

Acceleration is proportional to the force exerted on an object. A = fnet / m

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3
Q

What is Newton’s 3rd Law of Motion?

A

Every action has an equal opposite reaction

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4
Q

What is the definition of friction?

A

A force that opposes motion

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5
Q

What is the definition of weight?

A

Mass in relationship to gravity

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6
Q

Why does gravity change depending on where you are on Earth?

A

Because the force of gravity is stronger closer to the core of the Earth

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7
Q

What is the formula for weight?

A

Fg = mass times gravity

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8
Q

What is the formula for acceleration?

A

Acceleration = fnet / mass

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9
Q

What is the formula for friction?

A

Friction = ‘u’ times normal force

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10
Q

What is the formula for normal force on an angle?

A

N = fg - fy

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11
Q

What is fnet?

A

Fnet = applied force - friction
Fnet = mass times acceleration

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12
Q

What is tension on an Atwood Machine?

A

Object moving down: Tension = Fnet + fg
Object moving up: Tension = fg - Fnet
Prove tension by showing the two tensions are equal

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13
Q

What is normal force on an incline?

A

N = fgy

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14
Q

What are the cases of an incline plane?

A
  1. Sliding on it’s own (Fnet = fgx - f)
  2. Pushing it up a hill (Fnet = fa - fgx - f)
  3. Pushing it down a hill (Fnet = fa+ fgx - f)
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15
Q

Is mass relevant on an incline?

A

No

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16
Q

How do you solve for acceleration on an incline?

A

Fnet = fgx -f
Ma = mg (sintheta) - ‘u’(mg)(costheta)
A = g (sin theta) - ‘u’ (g) (cos theta)

17
Q

Why is your weight different at the top and bottom of an elevator?

A

Because it accelerates at the bottom and top

18
Q

What is the formula for elevator problems?

A

Normal force (your weight) = -(-mg) + ma

19
Q

Does sign of acceleration matter in elevator problems?

A

Yes

Physics: Kinematics (4 decks)

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