![rennytheraccoon](/avatars/10107.jpg)
rennytheraccoon
06.07.2019 •
Physics
Aboy sits motionless partway down a playground slide. the force of friction balances the force of gravity. a girl hands the boy a book. why does the boy still not move? a. holding the book does not effectively increase the mass of the boy. b. newton's first law of motion does not apply because the boy is at rest. c. the force of friction and the force due to gravity increase together. friction and gravity are still balanced. d. the mass of the book cancels out part of the mass of the boy.
Solved
Show answers
More tips
- S Science and Technology Understanding Magnetic Storms: A Guide to This Natural Phenomenon...
- D Dating, Love, Relationships How Long Can Love Last?...
- A Auto and Moto Mastering One-Movement Parking: All You Need to Know...
- C Computers and Internet How to Properly Order Clothing from International Online Stores...
- H Health and Medicine Headache: A Comprehensive Guide to Treatment...
- F Family and Home How to Choose the Best Diapers for Your Baby?...
- A Auto and Moto Discovering the Leader: What is the Most Expensive Car in the World?...
- F Food and Cooking How to Quickly Put your Child to Sleep?...
- C Computers and Internet How to Create a Website for Free and Easy?...
- F Family and Home Parquet or laminate, which is better?...
Answers on questions: Physics
- P Physics In the same way that other functions can be combined, a series of transformations can be combined into a single function. For example, this statement for the function S shows...
- P Physics A remote-controlled helicopter flew 515meters west at a constant velocity. It flew that distance in 50.0seconds. What was the helicopter s velocity? HELP ASAP BEING TIMED...
- P Physics Amicrowave oven has a power rating of 850 w. if the microwave is turned on for 6 minuites how much energy will it use? ?...
- P Physics Which feature forms most of the ocean floor...
- P Physics Can somebody me. i don t understand....
- P Physics In deciding whether to use a technology, people must analyze...
- P Physics How do forces act when they are not in contact with each other?...
- B Biology What takes charge of the body s involuntary functions outside conscious awareness...
- H History Which of the following is to believe to have played a role in the collapse of the soviet union...
- B Biology What does warm water carried by the gulf stream to the north atlantic ocean cause...
Ответ:
C.
The force of friction = coefficient of friction * normal force.
Adding the book to the boy increases the normal force and the component of the gravitational force directed down the slide. This in turn increases the force of friction as can be seen by the relationship from the above equation. For a stationary object, the force of static friction is always equal to the force applied (in this case, it is the component of the gravitational force directed down the slide). That means that so long as the boy is not moving and his mass increases, the frictional force is increasing also to balance the increased downward gravitation force directed down the slide.
Ответ:
C
Explanation: