3. Which of the following is one way of increasing the
A. wearing rubber-soled shoes
C. wearing roller skates
B. waxing the floor
D. using lubricants
4. Why does a car move faster on a cemented road than on a bumpy road?
A. Friction is greater on a cemented road.
C. There is no friction on a cemented road.
B. Friction is lesser on a cemented road.
D. The car can roll only on a cemented road