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AS levels Resurrection > P 3. Dynamics Revamp > Flashcards

P 3. Dynamics Revamp Flashcards

1
Q

What are the 8 actions a force can produce?
(3 min)

A
  • Pushing
  • Pulling
  • Lifting
  • Bending
  • Twisting
  • Tearing
  • Stretching
  • Squeezing
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2
Q

What are the 8 types of forces?
(3 min)

A
  • Weight
  • Magnetic
  • Upthrust
  • Air resistance/drag
  • Electrostatic
  • Friction
  • Thrust/driving force
  • Tension
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3
Q

How to find resultant force in general?

A

Based on which has more force on either direction

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4
Q

What is Newton’s 1st Law?
(3-way)

A
  • An object remains at state
  • or at constant speed
  • unless acted upon an external force
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5
Q

What is Newton’s 2nd Law?
(Complex)

A

F = (mv - mu)/t

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6
Q

For Newton’s 2nd law, what does the size of acceleration depend on?
(2 things)

A
  • Size of resultant force acting on the body
  • Size of the mass of the body
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7
Q

If acceleration of an object is directly proportional to the size of the resultant force acting, what does it mean?

A

As acceleration increases, size of the resultant force increases

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8
Q

How can u tell if it’s directly proportionally in a graph?

A

Straight line

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9
Q

Newton’s 2nd Law simple form?

A

Σ F = m x a

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10
Q

Newton’s 2nd Law simple form expressed in words?

A

Resultant (N) = Mass (kg) x acceleration (m/s2)

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11
Q

Definition of the Newton
(3-way)

A
  • A resultant force of 1 newton is produced
  • when a mass of 1kg accelerates
  • at 1ms-2
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12
Q

Define mass
(3 points)

A
  • Measure of matter in your body
  • Measured in kg
  • Is always the same
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13
Q

Define weight
(3 points)

A
  • The force due to gravity
  • Measured in newtons (N)
  • Changes depends on the gravitational field of an object
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14
Q

Weight = ?

A

mg

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15
Q

Weight = ?
(expressed in words)

A

weight = mass x gravity

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16
Q

What is Newton’s 3rd Law?

A

Every action has an equal and opposite reaction

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17
Q

What does g usually equal to?

A

9.81 ms-2

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18
Q

What are 2 forces that are resistive forces?

A
  • Friction
  • Air resistance
19
Q

During a free-fall without air resistance, which usually reaches the ground first?

A

The heavier object

20
Q

What’s the term for constant velocity?

A

Terminal velocity

21
Q

Explain the skydiver jumping out of plane
(Free fall with air resistance)
(2 points)

A
  • 0 air resistance
  • W > R therefore acceleration
22
Q

Explain skydiver falling for more than a few seconds now
(Free fall with air resistance)
(2 points)

A
  • Getting faster = air resistance increases rapidly
  • Less acceleration but still getting faster
23
Q

Explain skydiver reaching terminal velocity?
(Free fall with air resistance)
(3 points)

A
  • Reaches speed where W = R
  • Resultant force = 0
  • 0 acceleration
24
Q

Explain skydiver releasing parachute?
(Free fall with air resistance)
(3 points)

A
  • Drag force beings to rapidly increase
  • He starts to decelerate
  • R > W
25
Q

Explain skydiver’s parachute fully open?
(Free fall with air resistance)
(3 points)

A
  • Large surface area = Larger drag force
  • R > W
  • He quickly slows down, still moving down
26
Q

Explain parachutist reaching terminal velocity
(Free fall with air resistance)
(3 points)

A
  • Eventually balances weight force
  • R = W
  • Moves much slower terminal velocity
27
Q

Define linear momentum of an object?

A

The product of its mass and its velocity

28
Q

Momentum equation?

29
Q

Momentum equation expressed in words?

A

Momentum = mass x velocity

30
Q

Define p
(Momentum equation)

A

Momentum
(kgms-1)

31
Q

Define m
(Momentum equation)

32
Q

Define v
(Momentum equation)

A

Velocity
(ms-1

33
Q

State the principle of conservation of momentum?
(3 way)

A
  • In any collision within an isolated system,
  • total momentum of interacting bodies
  • remains constant
34
Q

Equation form of the principle of conservation of momentum?

A

(M1 x U1) + (M2 x U2) = (M1 x V1) + (M2 x V2)

35
Q

Equation form of the principle of conservation of momentum expressed in words?

A

Total momentum before collision = Total momentum after collision

36
Q

Define M
(Principle of conservation of momentum equation)

37
Q

Define U
(Principle of conservation of momentum equation)

A

Initial Velocity
(ms-1)

38
Q

Define V
(Principle of conservation of momentum equation)

A

Final velocity
(ms-1)

39
Q

What are the 3 different types of collisions?

A
  • Elastic collision
  • Inelastic collision
  • Explosive collision
40
Q

Explain elastic collision?
(2 things)

A
  • All KE conserved
  • KE stays the same
41
Q

Explain inelastic collision
(2-way + 1)

A
  • Some/all KE lost/converted,
  • to thermal or others kinds of energy
  • KE decreases
42
Q

Explain explosive collision

A

KE increases

43
Q

SPAM past papers buddy

A

Get down bud

AS levels Resurrection (28 decks)

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