7k Forces And Motion Test 2004

Do not write on this sheet!

For questions 1 to 8 choose the correct word from the brackets to make each sentence correct 1. Force is measured in (newtons/ metres /stone /kilograms) 2. Your weight is a (push/force/upthrust/newtons) which pulls you (downwards/upwards) 3. We measure speed in (metres/seconds/metres per second/newtons) 4. The force that stops you slipping on the ground is called (friction / upthrust/ weight) 5. Weight is due to the (electrical/magnetic/gravitational) force of the Earth. 6. We can reduce friction in a bicycle by using (oil/paint/chrome/water) to act as (insulation/lubrication/distillation) of the moving parts. 7. A car goes 1000m in 1 minute. It increases its speed during the next minute. This means that it goes (further / not so far /the same distance) in a minute. 8. A car takes 3 minutes to go 1 kilometre. It then increases its speed which means that it will go the same distance in (a longer time / a shorter time / the same time) Complete the table by choosing words from the box to give the correct name of the forces described.

Description 9 10 11 12

Name of Force

A driving force created by the push of a dolphin's tail. Upwards force created by water on a body dipped into it. A force due to gravity

weight thrust tension drag upthrust lift

Force of resistance due to air or water

For question 13 to 15, look at the diagram of forces on a car moving forward and complete the table to match up the forces with the letters A, B c or D

Description of force 13 14 15

Driving force due to the engine Weight force due to gravity Drag force due to friction

Which arrow on the diagram?

D C A B

2000N

Use either the word increases or reduces to complete the description about friction in bicycles. 16. A bicycle tyre _________ friction between the wheel and the road. Putting on the brakes _________ friction between the brake block and the wheel. Oil ___________ friction between the wheel and the axle. For questions 17 and 18, use the tug-of-war diagrams . 17. In which of the diagrams is there a resultant (overall) force of 3000 N? A, B, C or D? 18. Which team will move to the left? A, B, C or D?

2000N

A

2000N

2000N

2000N

2000N

3000N

B

3000N

2000N

2000N

C

D

2000N

2000N

The diagram below shows the directions of four forces acting on an aeroplane while it is flying. 19. What causes force W? 20. What produces force Z? 21. What happens if X and Y are equal? 22. What happens eventually to the speed of the plane if Z becomes smaller and smaller? A swimming dolphin travels 100 metres in 5 seconds. Fill in the gaps to find out its speed. Use words to complete Questions 23 and 24, and numbers to complete questions 25 and 26 23. Speed = __________ divided by ________. 24. That's 100 metres divided by 5 __________ 25. Speed = 100 / ______ 26. So the dolphin's speed = ______ metres per second. A runner can run a race over a distance of 500m in 100s. Use the same method in the last question to help calculate her speed. Use numbers to complete questions 27 and 28 27. Speed = ______ / ______ 28. So the runner’s speed = ______ metres per second A person on Earth has a mass of 75 kg and a weight of 750 N. On a planet with a force of gravity twice as big as on Earth….. 29. what would be the mass of the person? 30. what would be the person's weight? Well done! Now go back and check your work to make sure you haven’t made any silly mistakes.

2000N

1000N