Standard Science Primary 6 Interactions

Siti pushed a 500g block across Surface X and then across Surface Y. She observed that the block travelled a longer distance on Surface X. Which of the following is a possible reason?

A Surface X is rougher than Surface Y.
B The block gained more gravitational potential energy on Surface X.
C The mass of the block increased on Surface Y.
D Surface X has less frictional force than Surface Y.
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Worked Solution

Step 1: Distance travelled is inversely related to friction. Step [2-9]: If the block travelled further on X, Surface X must exert less friction than Y. Step [2-9]: Smoother surfaces exert less frictional force.

Correct answer: Surface X has less frictional force than Surface Y.

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