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### Upper Elementary Science - II4.13 Friction

 Friction is a force that happens when two bodies rub against each other. Friction is higher when the surfaces are very rough. Friction is a slowing force and is a kind of resistance to motion of objects. Friction can be classified as: Static Friction Kinetic friction Static friction: The friction acting on a body at rest. The force being applied on a body is usually referred to as static friction. Kinetic friction: The friction on a body that is moving is called kinetic friction. Friction occurs among all states of matter. Directions: Answer the following questions.
 Q 1: Friction is a forceFalseTrue Q 2: Friction occurs only among solidsTrueFalse Q 3: Which of the following is true about frictionFriction is the least on a polished surfaceFriction occurs when two bodies rub against each otherFriction occurs only when objects move Q 4: On which of these surfaces will a toy slope down easilyCarpetPolished floorA rough wall Q 5: You are able to sit on a slope without sliding. What stops you from sliding downForceWeightFrictionGravity Q 6: Which of these is a method to reduce frictionOiling the door hingesUsing checked surfacesApplying grit Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!