# P5: Space for Reflection

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- Created by: Theex
- Created on: 23-04-14 15:53

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- P5: Space for Reflection
- Vectors and equations of motion
- Left -> right is +
- Right -> Left is -
- What the arrow shows about the vector quantity
- Direction of arrow shows direction of vector quantity
- Length of arrow shows size of vector quantity

- Relative motion - how fast an object appears to be moving compared to you.
- V of 'a' relative to 'b' = Va - Vb

- To resolve vectors acting at 90 use pythagoras theorem

- Equations of Motion
- These equations can describe the motion of almost any object using maths
- suvat
- s = distance travelled (m)
- u = initial velocity (m/s)
- v = final velocity (m/s)
- a = acceleration (m/s^2)
- t = time taken (s)

- Equations
- v = u + at
- s = ut + (1/2)(a)(t^2)
- v^2 = u^2 + 2as
- s = ((u + v)/2)t

- Projectile motion
- Mr Hays' quote: "Gravity doesn't take a holiday just because an object is moving
- Gravity = 9.81ms^-2
- What equations to use?
- Vertical Plane: suvat
- Equations
- v = u + at
- s = ut + (1/2)(a)(t^2)
- v^2 = u^2 + 2as
- s = ((u + v)/2)t

- suvat
- s = distance travelled (m)
- u = initial velocity (m/s)
- v = final velocity (m/s)
- a = acceleration (m/s^2)
- t = time taken (s)

- Equations
- Horizontal plane...
- v = s / t

- Vertical Plane: suvat
- Time is the only value shared across both planes
- What equations to use?
- Vertical Plane: suvat
- Horizontal plane...
- v = s / t

- Vertical Plane: suvat

- What equations to use?

- Action and reaction
- Newton's Third Law: "When an object collides or two bodies interact, the two objects exert an equal and opposite force on each other."
- F = m * a
- When t * 2, a * 1/2 because...
- a = V / t
- And when a * 1/2 so is F because...
- F = m * a

- And when a * 1/2 so is F because...

- a = V / t
- Momentum
- Momentum is conserved
- Coalesce - When two objects moving in the same direction collide and stick together their momentum is then shared
- (m1 * u1) + (m2 * u2) = (m1 + m2)Vf
- p = m * v

- Vectors and equations of motion

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