1)An object experiences a force in the direction opposite itsmotion. This means
the work vector points in the negative direction
the scalar value of work is negative
the scalar vector of work could be either positive or negative,depending on which direction is chosen to be positive.
the work vector could point in either the positive or negativedirection, depending on which direction is chosen to bepositive.
2: A hand lifts a block vertically upward at constantvelocity. The work done by gravity on the block ____ ifthe system consists of the block only. The work done by gravity onthe block ____ if the system consists of the block and the earth.AND WHY?
is zero, is zero/is zero, is negative/is zero, is positive/isnegative, is negative/is positive, is positive
3: A block of mass M is moves down a frictionless ramp of angleθ and height H. The block is pushed at the top ofthe ramp so that its initial speed is 4 m/s.
Consider system A to be only the block and system B to be theblock and the earth together. Is the speed of the block at thebottom of the ramp in system A ______tothe speed of the block at the bottom of the ramp in systemB?
greater than, less than, or equal
