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Motorized Motion
Physics force question need confirmation of my answer?
A 0.075kg ball in a kinetic sculpture is raised 1.33 m above the ground by a motorized vertical conveyor belt. A constant frictional force of 0.350N acts in the direction opposite the conveyor belt's motion. How much total work is done in raising the ball?
What i did:
0.075 kg * 9.81m/s^2 = 0.73575 N = weight force of ball on earth
down forces= 0.736 N + 0.350N = 1N
Opposite force is 1N since acc is constant
Wnet = Fnet (d) (cos ??)
Wnet = (1N) (1.33m)
wnet = 1.33 J
RIGHT??
Whatever is the value of the frictional force and its direction, for a body to be lifted to a height h from the ground a work of mgh has to be done.
In your problem the lifting force is given only by the friction of the conveyor belt.
This gives a component force which is opposite to the weight of the ball.
In other words, the component of the friction gives the upward force to lift the ball which should be mg.
Hence the answer is 0.075 x 9.8 x 1.33 = 0.97755 Joule.
The conveyor belt acts like a simple machine only.
If we know the efficiency of the machine then we can find the actual work we did.
Or if the angle of frictional force to the horizontal is known then we can calculate the efficiency and or directly the total work done.
The frictional force cannot act vertically downward and if it acts so then the reaction force will act perpendicular to the weight of the ball.
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Motion Sickness In Children - How To Deal With Your Sick Child
Motion sickness is caused from crossed signals involving iyes, ears, skin receptons and muscles. This sickness usually occurs when traveling by motorized vehicles, airplanes, boats, cars, or trains. While traveling one will feel sick to their stomach.
Takin g a closer look at what happens to a child's system when motion sickness is involved, we find different parts of the body will send many conflicting signals to the brain. The many things the eyes see are sent to the brain in motion. Children's joint sensory and muscle receptors will transfer signals about movement of museles, positions of the body and which parts of the body is stationary.
The inner ear canal are equiped with a fluid which senses motion in any direction, forward, backward, up, down, side ways and circular. As the brain recieves these signals, it then tries to form a picture imitating the badies movements and position at any given time. But when the brain isn't able to draw its picture or make a connection with the information provided, the child will suffer motion sickness.
As an example: If, while riding in a car, a child is reading a book; the eyes will register the stationary book. However; the skin receptors and the ears will be sending the signal of movement to the brain. The different signals the brain is receiving, so many different peices of information that it becomes jumbled and confused. This then, in turn, causes the child to experience dizziness, upset stuomach and may even become tired.
With all these syptoms the child may become sick enough to throw up. As a parent it is a good idea to be prepared for such occurances while traveling. If for any reason the child is experiencing anxiety or fear;This will increase the chances of the child becoming sick while in motion.
Some steps to take for motion sickness prevention is to position the child in a forward postion. He or she should not face backwards. This helps the ears and eyes to signal the brain positively. Reading, video games or any stationary activity should be minimal or omitted.
While traveling on a plane or boat always try to look at the horizon, if your child must look out the windows. The child who experiences motion sickness, should always concentrate on things in a distance and are also in motion. Avoid looking at stationary items, this will cause the eyes confussion and the brain to get the wrong signals.
It will also help your child to sit in an area where the movement is the least noticed. Sitting close to the center is an ideal place. In an airplane, the middle aisle is the best position. On a boat being in the center not at the front or back is the best spot and the least sick he or she will feel.
If, inspite of the steps taken to help your child fail there are over the counter motion sickness medicine, but it is best to consult with your doctor. there may be a medical reason your child is having this struggle, such as an inner ear defect. He will also check other areas of the child's body that connect with motion sickness. He may be able to recommend an alternitive to medicine such as a plessure bracelet.
Carrying a sick bag and allowing extra time for travel can help. Giving the child opportunities to walk off the sickness before more traveling. The little things done can help to make travel more pleasant for your child.
About the Author
Abhishek is an expert Baby Shower organizer and he has got some great Baby Shower Secrets up his sleeve! Download his FREE 117 Pages Ebook, "How To Have A Roaringly Successful Baby Shower!" from his website http://www.Childbirth-Guru.com/121/index.htm . Only limited Free Copies available.
