a) A student wants to measure the coefficient of static friction us between a block of wood and an adjustable inclined plane. Of the following the minimum additional equipment the student needs to measure the value of us is 1. a timer only 2. a ruler and a weighing scale 3. a ruler and a protractor 4. a protractor and a weighing scale 5. a protractor only b) A block moving to the right on a level surface with friction is pulled by an increasing horizontal force also directed to the right, as the applied force increases, which of the following is true regarding the normal force and the friction force on the block. 1. Normal remains constant and friction remains constant 2. Normal increases and friction remains constant 3. Normal remains constant and friction increases 4. Normal remains constant and friction decreases 5. Normal increases and friction increases

a) A student wants to measure the coefficient of static friction us between a block of wood and an adjustable inclined plane. Of the following the minimum additional equipment the student needs to measure the value of us is 1. a timer only 2. a ruler and a weighing scale 3. a ruler and a protractor 4. a protractor and a weighing scale 5. a protractor only b) A block moving to the right on a level surface with friction is pulled by an increasing horizontal force also directed to the right, as the applied force increases, which of the following is true regarding the normal force and the friction force on the block. 1. Normal remains constant and friction remains constant 2. Normal increases and friction remains constant 3. Normal remains constant and friction increases 4. Normal remains constant and friction decreases 5. Normal increases and friction increases