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PE 1.3.b > Projectile Motion > Flashcards

Projectile Motion Flashcards

1
Q

What is projectile motion?

A

The movement of a body through the air following a curved flight path under the force of gravity

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2
Q

What is a projectile?

A

A body launched into the air and subjected to weight and air resistance forces

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3
Q

How does the speed of release affect projectile motion?

A

The 2nd Law of Motion means a greater force = greater acceleration of the projectile into the air = the further the projectile will travel

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4
Q

How will a 90 degree release angle affect projectile motion?

A

The projectile will accelerate vertically and come straight back down to the ground

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5
Q

How will a 45 degree release angle affect projectile motion?

A

Horizontal distance in maximised

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6
Q

How will a release angle greater than 45 degrees affect projectile motion?

A

Projectile will reach peak height too quickly and rapidly return to the ground

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7
Q

How will a release height less than 45 degrees affect projectile motion?

A

Sufficient height isn’t achieved to maximise flight time

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8
Q

What is a positive relative release height?

A

A release height above landing height

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9
Q

What is a negative relative release height?

A

A release height below landing height

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10
Q

What is the effect of a positive relative release height?

A

Increased flight time and optimal angle off release is less than 45 degrees

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11
Q

What is the effect of a negative relative release height?

A

The optimal angle of release is greater than 45 degrees because the projectile needs increased flight time to overcome the obstacle

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12
Q

What is a parabola?

A

A uniform curve symmetrical about it’s highest point

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13
Q

What is a parabolic flight path?

A

A flight path symmetrical about it’s highest point caused by the dominant weight force of a projectile

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14
Q

What is a non-parabolic flight path?

A

A flight path asymmetrical about its highest point caused by the dominant force of air resistance of the projectile

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15
Q

What are the 3 phases of projectile motion, before the projectile is accelerated by gravity to the ground?

A
  • Start of flight
  • Mid flight
  • End of flight
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16
Q

What does a parallelogram of forces show?

A

The resultant (NET) force acting on a body

17
Q

What is the Bernoulli Principle?

A

A lift force on a projectile in flight resulting from higher velocity of air flow and lower surrounding pressure

18
Q

What is an aerofoil shape?

A

A curved upper surface and a flat lower surface

19
Q

What happens when air moves underneath the aerofoil shape?

A

Air travels a shorter distance meaning higher pressure and lower velocity

20
Q

What happens when air moves over the aerofoil shape?

A

Air travels a longer distance meaning lower pressure but greater velocity

21
Q

How do F1 cars remain on the floor at high speeds?

A

They reverse the Bernoulli principle and create a ‘downwards lift force’

22
Q

What is the Magnus effect?

A

The creation of additional Magnus force on a spinning projectile which deviates the flight path

23
Q

What is Magnus Force?

A

A force created from a pressure gradient on opposing surfaces of a spinning body moving through the air

24
Q

How is spin created?

A

Applying an external force outside of the centre of mass?

25
Q

What is topspin?

A

An eccentric force is applied above the centre of mass that will cause a downwards spin around the transverse axis

26
Q

What is backspin?

A

An eccentric force applied below the centre of mass that will cause a spin upwards around the transverse axis

27
Q

What is a hook?

A

An eccentric force applied right of the centre of mass that will cause a spin left around the longitudinal axis

28
Q

What is a slice?

A

An eccentric force applied left of the centre of mass that will spin right around the longitudinal axis

29
Q

What is the effect of Magnus force on topspin?

A

A downwards Magnus force will shorten the flight path

30
Q

What is the effect of Magnus force on backspin?

A

Upwards Magnus force will lengthen the flight path

31
Q

What is the effect of Magnus force on sidespin?

A

Magnus force swerves the flight path

PE 1.3.b (4 decks)

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