Why is it important to know the direction of the force applied to a moving object and the direction in which the object is moving when determining the work done on the object? a. only the component of the force perpendicular to the motion is used to calculate the work. b. if the force acts in the same direction as the motion, then no work is done. c. when there is an angle between the two directions, the cosine of the angle must be considered. d. a force at a right angle to the motion requires the use of the sine of the angle.

sleep paralysis is a parasomnia, events associated with sleep.

sleep paralysis happens when you are in the middle of waking up or falling asleep. it is the feeling of being conscious but unable to move. it definitely involves hallucinations.

i had a friend that had sleep paralysis and he told me a story one time where he was laying in bed and he couldn't move his body no matter how hard he tried and there was someone standing in the corner of his room coming towards him. he couldn't move and you can't "wake up" because you are already conscious. sometimes sleep paralysis can be triggered by frequent waking up during the night based off of multiple trips to the bathroom, or if you had ever been abused, sleep paralysis can start happening from things like that.