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Transcript of 1111 2222 3333 4444 5555 6666 7777 8888 9999 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26.
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11 22 33 44 55 66 77
88 99 1010 1111 1212 1313 1414
1515 1616 1717 1818 1919 2020 2121
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1. What two measurements are needed to calculate the average speed of an object?
Distance and Time
answer
![Page 3: 1111 2222 3333 4444 5555 6666 7777 8888 9999 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26.](https://reader035.fdocuments.us/reader035/viewer/2022081511/56649da85503460f94a95497/html5/thumbnails/3.jpg)
2. What equation would be used to calculate average speed?
Speed = distance / time
answer
![Page 4: 1111 2222 3333 4444 5555 6666 7777 8888 9999 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26.](https://reader035.fdocuments.us/reader035/viewer/2022081511/56649da85503460f94a95497/html5/thumbnails/4.jpg)
3. A trolley takes 1.5 s to travel 60cm
Calculate its average speed..
v = d/t
= 60 / 1.5
= 40 cm/s
answer
![Page 5: 1111 2222 3333 4444 5555 6666 7777 8888 9999 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26.](https://reader035.fdocuments.us/reader035/viewer/2022081511/56649da85503460f94a95497/html5/thumbnails/5.jpg)
4. Does a car speedometer give average or instantaneous speed?
instantaneous
answer
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5. Give one advantage of using an electronic timer rather than a hand
held stopwatch.
Removes effect of reaction time
answer
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6. What is meant by the term acceleration?
Change in speed per second
answer
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7. Acceleration is measured in metres per second per second.
Write this in symbol form.
m/s/s or m/s2or ms-2
answer
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8. What equation is used to find acceleration?
a = (v-u)/t
answer
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9. An object starts from rest and reaches 8m/s after 4s .Find the acceleration.
a = (v-u) / t
= (8-0)/4
2 m/s2
answer
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10. The times for 4 cars to reach 100 km/h are shown below. Which car has the greatest acceleration?
answer
Car Time(s)
A 10.1
B 8.3
C 16.4
D 12.9
Car B
(shortest time to go
from 0 – 100 km/h)
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11. Describe the motion of the object represented by the speed – time graph
below.
Constant Speed answer
time
Speed
o
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12. The velocity – time graphs for two objects are shown below
Which object has the larger acceleration.
Object A – steepest slope
answer
A
B
time
speed
O
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13. What is represented by the area under a speed- time graph?
Distance travelled
answer
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14. State three effects of a force.
Change of speed, shape and direction.
answer
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15. What is the unit of Force?
Newtons (N)
answer
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16. Name an instrument which can be used to measure forces.
Newton balance or spring balance.
answer
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17. What is a Scalar Quantity? Give examples.
Scalar quantities can be described completely by their size or magnitude.
e.g. Distance, time, mass and speed
answer
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18. What is a vector? Give examples.
Vectors are quantities with a magnitude and a direction. e.g. Weight, displacement, acceleration and velocity.
answer
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19. What is the difference between speed and velocity.
Velocity = displacement/time
(vector)
Speed = distance / time
(scalar)
answer
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20. Which force always opposes the motion of an object?
Friction
answer
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21.The forces on the object below are balanced.
answer
50N
F50N
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22. The forces on an object are balanced.Describe the possible motion of the
object.
answer
Stays at rest or moves with constant speed in a straight line.
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23. An unbalanced force causes an object to accelerate.
What will affect the size of the acceleration?
answer
The size of the unbalanced force and the mass of the object
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24. A dog runs 300m south then turns and runs a further 400m east in a total
time of 50s. What is the dog’s displacement from its starting position and
its average velocity?.answer
300m400m
300m
400mThis is the resultant displacement, the magnitude can be calculated by Pythagoras.
S = √(3002 + 4002)
S = 500m
We use SOH CAH TOA to work out angle x° which we need to give the direction.
tan X = 400/300 x° = tan-1 (400/300) x° = 53.1°
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25. A 4kg object has an acceleration of 5m/s2.Find the unbalanced force acting on the object.
answer
F = m x a
= 4 x 5
= 20N
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26. Find the acceleration of the object shown below.
answer
2m/s2
10kg20N