1. a)When applying Newton's 2nd Law to an object on an inclinedplane, we choose the coordinate axes parallel and perpendicular tothe plane because

it makes the friction force negligible

it means we do not have to split the gravitational force intotwo components

it makes acceleration along one axis equal to zero

it makes all the forces sum to zero

all of the above

b) The acceleration of an object of mass m down an incline isequal to g*sin(theta)

always

never

only when the mass is light enough to be assumed negligible

only when there is no friction between the mass and theincline

c and d

c) Consider a mass resting on an inclined plane , The magnitudeof the normal force

is equal to the magnitude of the weight

is greater than the magnitude of the weight

is less than the magnitude of the weight

is equal to the gravitational field strength, g

a and d

d) A block sitting on an inclined plane starts to slide down theplane when it is inclined at a given angle. To solve foe thecoefficient of static friction between the block and the inclinedplane, you need:

only the angle

the mass of the block and the angle

the coefficient of kinetic friction

b and c

this is not in the chapter

e) Consider two masses on a frictionless inclined (ideal)Atwood's machine, In order to solve for BOTH the acceleration ofthe masses and the tension in the string using Newton's second law,we need to know

both masses, the angle, and the normal force

both masses and the angle but not the normal force

both masses but not the angle and not the normal force

it is not possible to solve for both using Newton's second law;an experiment must be done

it is not possible to solve for both using Newton's second law;conservation of energy must be used