Ch 2 Homework 2)10 N right 9) Zero 11) 90 14) Yes, F = 0 if moving in a straight line at constant speed 24) D, A, C, B 29) half her weight

24) D, A, C, B 29) half her weight 35) 200 N 40) The tension is greater than her weight 45) 150 N 46) 450 N

Equilibrium 1. What occurs when all the forces acting on an object are balanced. the sum of the +x forces on an object equals the sum of the –x forces, the net force on the object is zero, and the sum of the upward forces equals the sum of the downward forces? 2. Does the equilibrium rule apply to objects in uniform motion or at rest or both 3. Does the equilibrium rule apply to vectors or scalars? Ch 2 Jeopardy equilibrium both Vectors

Equilibrium 3. Does the equilibrium rule apply to vectors or scalars? 4. When you press a coiled spring downward with 20 N, the spring presses upward on your hand with what force? 5. Bob holds an apple at rest in his outstretched hand. To what is the force he applies equal? Ch 2 Jeopardy Vectors 20 N weight

Forces 1. Minimum resultant possible when adding 5 N and 8 N. 2. Maximum resultant possible when adding 5 N and 8 N 3. Net force when 7 N and 4 N act in same direction. 5. A pair of parallel forces of 6 N and 14 N can have a resultant of anything between what 2 values? 3 N 13 N 11 N 3 N 8 N - 20N 4. Net force when 7 N and 4 N act in opposite directions.

Pot Pourri 1. # of forces acting on a rock suspended by a weight scale 2. Which kind of force is always represented by a vector that acts straight down, even if the object is on a hill. 3. When Eileen stands on two bathroom scales, one foot on each scale with her weight evenly distributed, each scale will read how much of her weight? 2 weight half

Pot Pourri 3. When Eileen stands on two bathroom scales, one foot on each scale with her weight evenly distributed, each scale will read how much of her weight? 4. When Art hangs by a pair of vertical ropes, the tension in each rope will be how much of his weight? 5. Coyote place an anvil on a wire midway between 2 poles. How does the tension in the line compare to half the weight? half more