Port Said International Schools
Better Education for Future Generations
Science Department
Worksheet:1
Date: 20/3/2014
Name :…………………………….
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Complete the following sentences:
1. The effect of the friction force is in the …………………………..direction of the movement.
2. When you put a plastic cube on the top of the inclined wooden board, the cube doesn’t move,
because …………………….…………. is larger than …………………………………..
3. When the direction of movement of car tires is forward, so the direction of friction force
…………………………………………..….
4. …………………………. and ………….…………..are factors that affect on the friction force.
5. ……………………. is formed of a group of small metallic balls with smooth surfaces.
6. ………………………..and …………………………. are materials used to decrease the friction force.
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Rewrite the following statements after correcting the underlined words
1. The friction force depends on the shape of the two touching objects.
……………………………………………………………………………………………………………………………………………..
2. The friction force between a marble and a glass surface is higher than that between the
marble and a wooden surface.
………………………….………………………………………………………………………………………………………………
3. Oil increases the friction force between the moving parts of machines.
………………………………………………………..…………………………………………………………………………………
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(B) Look at the opposite figures, then answer the following questions:
(B) Look at the opposite figures, then answer the following
questions
1. What is the reason that causes the sliding down of
the toy car in figure (B)?
…………………………………………………………………………….
2. Why doesn’t the toy Car in figure (A) move?
…………………………………………………………………………….