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Test 2008 bu

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  • 1. Year 9 Forces TEST Name__________________________________________________1. Match up the letter of the statements below with the correct word that describes the forces listed in the table. A. The force exerted by a surface as an object moves across it or makes an effort to move across it. B. The force that occurs at both ends of a rope or string. C. The force caused by the pull of gravity. Weight Friction Tension R2. Draw the shape of the earth’s gravitational force field onto the diagram below.Use arrows to show the direction of the force field. R3. Complete the table below using the words attract or repel to describe the effect of the forces in the situations listed. Situation Effect Two magnets with north poles near each other An object moving past the earth’s gravitational field R
  • 2. 4a. Name the term (word) given to substances that can reduce friction.__________________________________________________________________________________ R4b.Give an example of such a substance and explain how it reduces friction. R L5. If an object is moving to the right, state the direction of the friction force acting on the object._________________________________________________________________________________________ R6. A truck has become stuck in mud and the back wheels are spinning due to a lack of friction.Explain how placing wooden planks under the wheels of the truck will help her to move the truck. L7. Diandra is a member of the Epsom junior A soccer team. Diagram 1 shows Diandra about to kick the ball to Gemma.i) On diagram 2 draw and label the arrow(s) to show the force(s) acting on the ball while it is in the air and after it hasleft her foot. (ignore friction forces) Diagram 1 Diagram 2 R Lii) The ball is now lying on the ground. Draw and label arrows to show the force(s) acting on it.
  • 3. R L8. Sarah convinces her dad to put up a swing in their back yard. He finds an old tyre and ties it to a tree with a piece ofrope.Draw a free body force diagram to show the forces acting on the tyre only. Name the forces. R L9. Explain in terms of forces why the swing does not move up or down when it is suspended.__________________________________________________________________________________________________________________________________________________________________________ L10. Explain in terms of forces what might happen if Sarah is too heavy for the rope when she gets on the swing.____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ R L11. Name the force(s) acting on Sarah as she falls towards the ground._____________________________________________________________________________________ R12. Sarah now gets on her bicycle to ride to a friends house for a training session.Circle the forces that will control her speed as she moves along the road.
  • 4. Weight force Thrust force friction force support force R13. Discuss how the sizes of the horizontal forces and vertical forces on Sarah change as she goes from a constantspeed situation and begins to slow down.________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ L L14. A sports car is more stable travelling on a road and less likely to tip over when turning corners than a large truck. Discuss why.__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ LL Achieved: 7 out of 12 Recall / Link opportunities Merit: Achieved, including 6/11 Link opportunities Excellence: Achieved including 8/11 Link opportunities