Motion in 2-D

1. 1Resultant Velocity:
   1. Draw a diagram with the [blank_start]vertical component[blank_end] Vv and the [blank_start]horizontal component[blank_end] Vh and the [blank_start]resultant velocity[blank_end] V with the [blank_start]angle[blank_end] to the horizontal.
   2. Use [blank_start]Pythagoras[blank_end] and/or [blank_start]trigonometry[blank_end] to work out the resultant velocity/ Vv / Vh / the angle to the horizontal.

   

   1. Avertical component
   2. Bhorizontal component
   3. Cresultant velocity
   4. Dangle
   5. EPythagoras
   6. Ftrigonometry
2. 2River Crossing:
   1. Arrange the information into a [blank_start]vector triangle[blank_end] and label the [blank_start]resultant[blank_end] velocity.
   2. Use trigonometry/Pythagoras for [blank_start]right-angled[blank_end] triangles to work out the [blank_start]resultant velocity[blank_end] and/or the [blank_start]angle[blank_end] to the horizontal/riverbank
   OR draw a [blank_start]scaled[blank_end] vector diagram to find angles and velocities with [blank_start]non-right-angled[blank_end] triangles.

   

   1. Avector triangle
   2. Bresultant
   3. Cright-angled
   4. Dresultant velocity
   5. Eangle
   6. Fscaled
   7. Gnon-right-angled
3. 3What are the velocities relative to?

   

   1. Arelative to the ground
   2. Brelative to the water
   3. Crelative to the ground
   4. Drelative to the water
   5. Erelative to the ground
   6. Frelative to the water
   7. Grelative to the riverbank
   8. Hrelative to the riverbank
   9. Irelative to the riverbank
4. 4Motion in 2-D:
   Horizontal motion and vertical motion are [blank_start]independent[blank_end] of each other.
   - Horizontal motion remains [blank_start]constant[blank_end] because it is [blank_start]unaffected[blank_end] by [blank_start]gravity[blank_end] so acceleration is [blank_start]zero[blank_end].
   - Vertical motion is affected by [blank_start]gravity[blank_end] so acceleration is always [blank_start]9.81[blank_end] ms^-2 [blank_start]downwards[blank_end] (on Earth).
   - This results in a [blank_start]parabolic[blank_end] shape as shown.

   

   1. Aindependent
   2. Bconstant
   3. Cunaffected
   4. Dgravity
   5. Ezero
   6. Fgravity
   7. G9.81
   8. Hdownwards
   9. Iparabolic
5. 5Initially vertical velocity is [blank_start]upwards[blank_end] (taken as positive).
   Once it reaches [blank_start]its peak[blank_end] it changes to [blank_start]downwards[blank_end] (taken as negative).
   Therefore, because the [blank_start]sign[blank_end] of the velocity changes halfway through the motion, [blank_start]suvat[blank_end] can only be used for [blank_start]half[blank_end] of the motion.

   

   1. Aupwards
   2. Bdownwards
   3. Cdownwards
   4. Dupwards
   5. Eits peak
   6. Fthe ground
   7. Gsign
   8. Hmagnitude
   9. Isuvat
   10. Jvelocity
   11. Khalf
   12. Lall
6. 6Air Resistance:
   - When air resistance acts on an object it causes [blank_start]deceleration[blank_end] horizontally as well as [blank_start]vertically[blank_end].
   - Deceleration due to air resistance results in a [blank_start]shorter[blank_end] distance covered [blank_start]horizontally[blank_end] and a lower [blank_start]maximum[blank_end] [blank_start]vertical[blank_end] [blank_start]height[blank_end] reached.
   - At maximum height, if horizontal deceleration has led to [blank_start]zero[blank_end] speed horizontally then the object will [blank_start]fall[blank_end] vertically
   ([blank_start]accelerate[blank_end] downwards due to [blank_start]gravity[blank_end]).

   

   1. Adeceleration
   2. Bvertically
   3. Cshorter
   4. Dhorizontally
   5. Emaximum
   6. Fvertical
   7. Gheight
   8. Hzero
   9. Ifall
   10. Jaccelerate
   11. Kgravity
7. 7Projectiles on other Planets:
   - A lack of an atmosphere means almost no [blank_start]horizontal[blank_end] [blank_start]deceleration[blank_end] due to [blank_start]friction[blank_end] so it increases the [blank_start]range[blank_end] of the projectile.
   - A lower gravitational field strength would mean a [blank_start]lower[blank_end] vertical [blank_start]acceleration[blank_end] and therefore an [blank_start]increased[blank_end] time of flight (t = (v-u) / a) hence also increasing the [blank_start]range[blank_end] of the projectile.

   

   1. Ahorizontal
   2. Bvertical
   3. Cdeceleration
   4. Dacceleration
   5. Efriction
   6. Fair resistance
   7. Grange
   8. Htime of flight
   9. Ilower
   10. Jhigher
   11. Kacceleration
   12. Ldeceleration
   13. Mincreased
   14. Ndecreased
   15. Orange
   16. Pheight
8. 8Projectile Calculations for a Full Flight:
   1. When finding time, t, remember to [blank_start]double[blank_end] the value you calculate to get the time for the [blank_start]full[blank_end] flight ([blank_start]suvat[blank_end] only works for [blank_start]half[blank_end] a flight).
   2. Use v = [blank_start]s / t[blank_end] for [blank_start]horizontal[blank_end] flight as usual.
   3. If asked to calculate an [blank_start]extra[blank_end] horizontal distance, use suvat to find the extra [blank_start]time[blank_end] and then s = [blank_start]v x t[blank_end] to find the extra [blank_start]distance[blank_end] (where v is the horizontal [blank_start]velocity[blank_end]).

   

   1. Adouble
   2. Bfull
   3. Chalf
   4. Dsuvat
   5. Es / t
   6. Fhorizontal
   7. Gextra
   8. Htime
   9. Iv x t
   10. Jdistance
   11. Kvelocity
9. 9Projectile Calculations for Half a Flight:
   1. Just use [blank_start]suvat[blank_end] as normal for [blank_start]vertical[blank_end] motion.
   2. Use v = [blank_start]s / t[blank_end] for [blank_start]horizontal[blank_end] motion.

   

   1. Asuvat
   2. Bvertical
   3. Cs / t
   4. Dhorizontal

Descripción

AS - Level (Mechanics) Sally's Physics Test sobre Motion in 2-D, creado por Sally Lancaster el 04/03/2016.

Autor

Sally Lancaster

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English

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Creado el 4 mar 2016 · actualizado el 6 may 2016

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