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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
Explain skydiver's parachute fully open? (Free fall with air resistance) (3 points)
- Large surface area = Larger drag force - R **>** W - He quickly slows down, still moving down
26
Explain parachutist reaching *terminal velocity* (Free fall with air resistance) (3 points)
- Eventually balances weight force - R = W - Moves much slower terminal velocity
27
Define linear momentum of an object?
The product of its **mass** and its **velocity**
28
Momentum equation?
p = mv
29
Momentum equation expressed in words?
Momentum = mass x velocity
30
Define p (Momentum equation)
Momentum (kgms-1)
31
Define m (Momentum equation)
Mass (kg)
32
Define v (Momentum equation)
Velocity (ms-1
33
State the principle of conservation of momentum? (3 way)
- In any collision within an isolated system, - total momentum of interacting bodies - remains constant
34
Equation form of the principle of conservation of momentum?
(M1 x U1) + (M2 x U2) = (M1 x V1) + (M2 x V2)
35
Equation form of the principle of conservation of momentum expressed in words?
Total momentum before collision = Total momentum after collision
36
Define M (Principle of conservation of momentum equation)
Mass (kg)
37
Define U (Principle of conservation of momentum equation)
Initial Velocity (ms-1)
38
Define V (Principle of conservation of momentum equation)
Final velocity (ms-1)
39
What are the 3 different types of collisions?
- Elastic collision - Inelastic collision - Explosive collision
40
Explain elastic collision? (2 things)
- All KE conserved - KE stays the same
41
Explain inelastic collision (2-way + 1)
- Some/all KE lost/converted, - to thermal or others kinds of energy - KE decreases
42
Explain explosive collision
KE increases
43
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AS levels Resurrection (30 decks)

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