18 (4 points) Match the term with the description Question 18 options: a force due to one object pushing or pulling another object a force that opposes the sliding of an object across another object a force perpendicular to the surface between objects in contact a force exerted on an object that can be stretched 1. normal force 2. tension 3. friction 4. applied force Question 19 (4 points) Match the term with the description Question 19 options: the result of all forces acting on an object a force exerted on an object that can be stretched a force that is directed away from the centre of a circle during uniform circular motion a force that is directed toward the centre of a circle during uniform circular motion 1. centripetal force 2. centrifugal force 3. tension 4. net force Question 20 (3 points) Match the term with the description Question 20 options: If the inertial net force on an object is zero, the object will remain at rest or continue to move at a constant velocity. For every action force there exists a reaction force equal in magnitude, but opposite in direction to the action force. The magnitude of the acceleration of an object is directly proportional to the net force and inversely proportional to the mass of the object. 1. Newton's first law 2. Newton's second law 3. Newton's third law