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Twenty Questions
Kinematics
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Twenty Questions
1 2 3 4 5
6 7 8 9 10
11 12 13 14 15
16 17 18 19 20
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1. What formula relates speed, distance and time?
• v = d / t• speed = distance/time
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2. What is deceleration?
• an object slowing down.
• negative acceleration.
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3. What is the difference between scalars and vectors?
• scalar has magnitude, only.
• vector has both magnitude and direction.
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4. Calculate distance travelled.
• d = area under v-t graph• d = ½ bh + lb + lb + ½
bh• d =½5x4 +4x5 +13x8
+½2x8• d = 10 + 20 + 104 + 8• d = 142m
v(m/s)
t(s)5
8
4
200 18
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5. A girls jogs 2km North, then turns & jogs 1.6km South. She does this in 10mins.What is her speed?
• v = d/t• v = 3600/600• v = 6ms-1
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• v = s/t• v = 400/600• v = 0.67ms-1 North
6. A girls jogs 2km North, then turns & jogs 1.6km South. She does this in 10mins.What is her velocity?
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7. A train accelerates from 20ms-1 to 30ms-1 in 2.5s.What is the trains acceleration?
• a = v - u = 30 – 20 t 2.5• a =4ms-2
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8. Describe the motion between B and C.
• The vehicle travels at constant speed.
• Zero acceleration.
v(m/s)
t(s)DA
B C
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9. A Harley Davidson accelerates, from rest, at 2.5ms-2 to 30ms-1 in 10s.What was the bike’s initial speed?
• a = v - u t• 2.5 = 30 – u 2• u =25ms-1
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10. Calculate the acceleration between 18s and 20s.
• a = v - u = 0 – 8 t 2• a =-4ms-2
v(m/s)
t(s)5
8
4
200 18
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11. A cross-country runner runs 200m North then 1km East.What is the runners displacement?
Scale 1cm:200m
s = 1020m at 79o
a2 = b2 + c2
• a = √2002+10002
a = 1019.80m
• s = 1019.80m at 078.7o
tanθ = O/A = 1000 ÷ 200 = 5
• θ = 78.7
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12. A bus accelerates at 3ms-2 from rest to 30ms-1. How long does this take?
• a = v - u t
• t = v - u = 30 – 0 a 3• t = 10s
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13. A bike accelerates at 5m/s2 from rest for 15s. What is it’s final speed?
• a = v - u t
• v = u + at = 0 + 5x15• v = 75m/s
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14. Describe the motion between A&B.
• Vehicle is accelerating.
v(m/s)
t(s)DA
B C
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15. What is the formula for velocity?
• v = s / t• velocity =
displacement time
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16.Describe the motion between C&D.
v(m/s)
t(s)DA
B C
• The vehicle decelerates.
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17. How is the apparatus shown, used to find the instantaneous speed of the trolley at the bottom of the ramp?
• Use light gate and timer to find time, t.• Length of mask, d. • v = d / t
Light gate
Timer
Ramp
Trolley
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18. What is the acceleration of an object moving at a steady speed?
• 0ms-2
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19. Which car has the smallest acceleration?
• Renault.
Car Time for 0-60 Max speedPorsche 6.3 138
Ford 12.8 125Renault 15.7 110Bentley 10.5 129
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20. Calculate the acceleration.
a = v - u = 8 – 4 t 5
a = 0.8ms-2
v(m/s)
t(s)5
8
4
200 18