0910 mc answers

8/8/2019 0910 MC answers

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American Academy Larnaca

Year 5 TestDouble Science

Physics

Topic P2.9: As fast as you can!

TTThhhuuur r r sssdddaaayyy 222111 MMMaaayyy 2009

Multiple choice

Time: 20 minutes

FORMULAE

You may find the following formulae useful.

time

ntdisplaceme velocityaverage =

t

sv =

time

yin velocitchange onaccelerati =

t

uva

)( −

=

force = mass × acceleration F = m × a

momentum = mass × velocity p = m × v

8/8/2019 0910 MC answers


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Investigating parachutes

Alison is investigating how the area of a parachute affects the time it takes to fall to the ground.She cuts different sized pieces from plastic bags to make the parachutes.

1. In her investigation the independent variable is

A the gravitational field strength

B the height the parachute is dropped from

C the time taken to fall to the ground

D the area of the parachute

2. The parachute falls through 2 m in a time of 0.5 s.What is the average velocity of the parachute?

A 0.5 m/s downwards

B 4.0 m/s downwards

C 0.5 m/s upwards

D 4.0 m/s upwards

3. Alison uses a computer simulation to analyse the motion and forces on a skydiver after he jumpsfrom his plane.Which row of the table is correct for the skydiver as his parachute opens?

direction of motion

of the skydiver

direction of the resultant

force on the skydiver

direction of the acceleration

of the skydiver

A upwards upwards upwards

B downwards upwards downwards

C upwards upwards downwards

D downwards upwards upwards

8/8/2019 0910 MC answers


8/8/2019 0910 MC answers


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6. Jane times three identical marbles falling between the two rubber bands.The values are 5.5 s, 5.7 s and 6.5 s.

She has no time to take more readings.The value she should use in her investigation is

A 5.6 s

B 5.7 s

C 5.9 s

D 6.5 s

7. People take a risk when they go on this “vertical fall” ride at a theme park.

Which row of the table shows the conditions for people to be most willing to take the risk?

How much choice do the people have? Have the people seen the ride before?

A a little yes

B a little no

C a lot no

D a lot yes

8. At one part of the ride, the speed of the car changes from 2 m/s to 6 m/s in 0.5 s.What is its acceleration?

A 1.5 m/s2

B 6.0 m/s2

C 8.0 m/s2

D 24 m/s2

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9. At one point during the ride a passenger exerts a force of 800 N on the seat.The passenger is pushed into the seat in this direction.

Which row of the table shows the size and direction of the force the seat exerts on the passenger?

size of force on the passenger (N) direction of force on the passenger

A 800

B 800

C 810

D 810

Investigating Forces

Donna and Alan are investigating forces.They use this apparatus to measure the force needed to pull a wooden block up a slope.

They find the average force when different weights are put on the wooden block.These are some of their results.

weight of block

(N)6 7 8 9 10

average force needed to pull block up slope

(N)3.5 4.1 4.7 5.9

10. The average force needed to pull the block with a 9 N weight is likely to be

A 5.0 N

B 5.3 N

C 5.5 N

D 5.6 N

support

wooden

block

newton

meter

wooden

board1 N weights

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11. Which row of the table lists the variables that they considered in their investigation?

kept constant

(to ensure a fair test)

the variable they changed

(the independent variable)

the variable they measured

(the dependent variable)

A weight of block angle of slope pulling force

B angle of slope weight of block pulling force

C angle of slope pulling force weight of block

D pulling force weight of block angle of slope

12. These are the readings from the newton meter for a block weighing 7 N.

1st

try 2nd

try 3rd

try 4th

try 5th

try 6th

try

pulling force (N) 4.0 4.1 4.2 4.1 4.2 4.0

These readings show that the method used

A is reliable

B has no error

C is not a fair test

D should not be used to justify a conclusion

Collisions

Nafis and her friends are investigating what happens when cars collide.They use a number of model cars on a frictionless track.

13. One of the model cars has a mass of 0.2 kg.The car is given an acceleration of 4 m/s

2.

The force needed to produce this acceleration is

A 0.05 N

B 0.8 N

C2.0 N

D 8.0 N

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Use this information to answer questions 14, 15 and 16.

The velocity-time graph shows the motion of a different model car during one experiment.

0

2

4

6

8

10

0 2 4 6 8 10 12 14

time in s

velocityin m/s

14. The acceleration of this car during the first 2 seconds is

A 0.2 m/s2

B 5 m/s2

C 10 m/s2

D 20 m/s2

15. After 5 seconds the momentum of the car is 4 kg m/s.What is the mass of the car?

A 0.4 kg

B 0.8 kg

C 20 kg

D 40 kg

16. Between which times is the resultant force on the car equal to zero?

A between 0 and 2 seconds

B between 2 and 10 seconds

C between 10 and 11 seconds

D between 10 and 14 seconds

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Use this information to answer questions 17 and 18.

Another model car has a mass of 2 kg.The diagram below shows the forces acting on the model car.

17. The acceleration of the car will be

A 1.0 m/s2

B 1.5 m/s2

C 2.0 m/s2

D 4.0 m/s2

18. To double the acceleration of the car we should

A double the thrust only

B double the drag only

C double the resultant force

D make the drag half the original value

19. Nafis and her friends discuss safety and collisions.

Who is correct?

A Nafis

B Heather

C Colin

D Mary

Nafis Heather

Colin Mary

Increasing a driver’sreaction time will reduce

the risk of an accident.

An airbag reduces the risk of injury because it has a

lot of kinetic energy.

A seat belt protects a driver in

a collision by reducing the rate

of change of his momentum.

Reducing the friction in a

car’s brakes will improve

their effectiveness.

thrustdrag

3.0 N1.0 N

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20. Nafis reads a web page about a driver who had an accident as he was driving to start a new job.Which of these is most likely to have increased the risk of an accident?

A The car had air bags

B The car had crumple zones

C The driver did not know the road

D The road was dry

21. The driver was saved because he was wearing his seat belt.According to official statistics, seat belts reduce fatalities by 30%.This means that

A In 100 passing cars there will be 30 less accidents

B In 100 accidents there will be 30 less cases that are fatal

C In 100 passing cars there will be 30 accidents

D In 100 accidents there will be 30 fatal cases

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Nafis and her friends find out about stopping distances from the Highway Code.

Use this information to answer questions 22, 23 and 24.

22. What is the thinking distance when a car is travelling at 45 km/h?

A 6 m

B 9 m

C 14 m

D 23 m

23. What is the stopping distance when a car is travelling at 60 km/h?

A 12 mB 23 m

C 24 m

D 36 m

24. The stopping distance for a car travelling at 90 km/h would be

A 18 m

B 28 m

C 56 m

D 74 m

TOTAL FOR MULTIPLE CHOICE PAPER: 24 MARKS ________________________________________________________________________________

END

= thinking distance = braking distance

speed of car

30 km/h

45 km/h

60 km/h

6 m

9 m

12 m

6 m

24 m

14 m

0910 mc answers

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