2. What is a force? A force is a push, pull or twist.

4. Friction If you rub your hands together there is resistance to the motion.

5. Measuring friction Measure the force needed to make the block move Use the forcemeter to pull the block until it is just about to move Pull the block over different surfaces forcemeter

6. Results Type of surfaceForce needed to make it move (N)

7. Conclusions It is a good idea to use “er” words to describe what you have found out Examples of “er” words: bigger, smaller What examples can you think of? Faster, slower, rougher, smoother, longer, shorter etc

8. Measuring friction Measure the force needed to make the block move Use the forcemeter to pull the block until it is just about to move Add 100 grams onto the block and repeat the experiment forcemeter

9. Results Number of masses on the block Force needed to make it move (N) 0 1 2 3 4 5

10. 3 Pull force (N) 2 241 4 6 8 10 No. of masses on block

11. Direction of friction Friction always acts in the opposite direction to the way an object is moving. For the following moving objects, mark with an arrow, the direction friction is acting in.

12. Friction effects Friction always acts in the o______ direction to which an object is moving in. Friction is a type of f____. Whenever you get friction between two objects you always get h___ and w_____. You can reduce the effect of friction by using a l______. O_ is a lubricant used in car engines to reduce friction effects. pposite orce eatearing ubricantil

13. Friction Useful or hindrance? High frictionLow friction Write down three instances where high friction is useful and three where low friction is useful.