Projectile Motion Flashcards

1
Q

What is projectile motion?

A

Objects in motion & affected by gravity
- called “trajectory” and represented by a parabolaaaright?? -J

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2
Q

Tell me what you know about multi-Image Diagram 0-0

A

Vertical & Horizontal components

waiiit i thought multi image diagram is the pic with balls n vectors??-J

  • i thought they were moving objects at different points in time…and how we can like do momentum and all that..-Y
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3
Q

What are the things you have to remember about vertical & horizontal components?

A
  • Vertical component: affected by m (gravity)
  • Horizontal component: remain CONSTANT!
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4
Q

Components questions require right triangles sometimes, list out the rules to find sides of a triangle?

A

Sin0= O/H (Opposite side)
Cos0= A/H (ADJ)
Tan0= O/A (Hyp)

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5
Q

Small reminder!

A

Air resistance is ignored when calculating!! Thats why horizontal component is constant 0-0

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6
Q

How to explain an object’s components when its launched into the air?

A
  1. The horizontal component of… will always remain constant at…
    • No external force acting on.. in the horizontal direction during…,
    • Resulting in NO a-> & NO change in speed (Newton’s 1st law: Inertia)
  2. Vertical component of… will change
  3. Force due to gravity is always acting on…
  4. No other force to counteract gravity while…
  5. F=ma-> implies there’s vertical component of…, speed is always changing (9.8ms-2 vertically downward)
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7
Q

What is the best launched angle?

A
  • ∠45*
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8
Q

Why ∠45* is the best launched angle?

A

It provides a maximum range (distance) for projectiles that land at the same height they were launched.

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9
Q

How does ∠45* relate to horizontal and vertical components?

A
  • Vertical component of v increases = an increase in time of flight
    (Thus, the object can last longer in the air, travelling larger)
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10
Q

What’s the role of AIR resistance?

A

It opposes the motion of the object through a medium, leading to a change in motion.

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11
Q

Is air resistance a force?

A

Yes

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12
Q

How is friction same and different from air resistance?

A

SAME: prevents objects from rolling/ moving

DIFFERENT: only apply for solid objects (on the ground)

the different part is for friction right?? ^^ - J

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13
Q

When does drag force occur?

A

When objects change motion due to any medium (E.g. AirResistance, Water, etc)

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14
Q

How does drag force work?

A

at in the opposite direction to object’s motion (affecting speed + direction)

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15
Q

What are the factors that influence the magnitude of drag force?

A
  • Speed of object
  • Cross-sectional area
  • Density of the medium (E.g. air particles contact with the object)
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16
Q

What is drag coefficients (A type of friction)?

A

Variety of shapes that support the idea of “Aerodynamic” in cars and aircrafts.

guys 0-0 do we actually need to know this though? -Y

17
Q

What does drag coefficients do to drag force?

A

Decreases the drag force. 0-0

wait i thought SOME shapes would also help to increase it??? -Y

18
Q

Hence, do you think faster moving subject have more OR less friction?

A

More 0-0

Why? Cos when it travels faster, more air particles will make contact with it and causes lots of friction (drag force)!

19
Q

When does terminal velocity occur?

A

It occurs when drag force is on a moving body (balance force), results in 0 net force.

20
Q

So, what can we conclude from terminal velocity in terms of force and drag force?

A

force is EQUAL and OPPOSITE to drag force, making a balanced force.