sliding friction is when you are sliding
Cartilaginous are slightly movable, but the most prominent type of movable joints are synovial joints, such as the knee and shoulder, which are very movable.
Joints that allow movement in a single plane are called trochlear joints, also known as hinge joints. Examples of such joints are the knee and the humero-ulnar joint of the elbow. Technically the knee does rotate slightly in the last few degrees of extension which is called the "screw home mechanism", but is still considered a hinge joint.hinge
Ball-and-socket joints allow movement in all directions. They are the hip and shoulder joints. Hinge joints allow movement in one direction only. They are elbow, knee, and finger joints. A pivot joint allows partial rotation of the head. It is located between the first two vertebrae in the neck. Gliding joints, where the bones move a short distance sliding against each other, are in the wrist and ankle.
The overall purpose of a joint is to provide movement . Differing types of joints allow for differing movements; a hinge joint allows motion in one direction whereas a pivot joint allows rotating or twisting motion.
Muscles don't bend at all, technically, joints and bones do, but in concept it would be the bicep and tricep because your elbows only move in 1 direction.
A periscope looks like a long pipe with a bend on either end. One bend faces a direction, and the other bend faces the opposite direction.
Because they are joints that hinge. A hinge can only go one direction. Like for example, a door hinges, and it can only go one direction unless you break the door. Then the door could go anywhere, but hinges only move one direction.
you can hear a echo in one particular direction because the direction you do it the waves bend back towards you
No bone can bend one way. I think you meant which joint can only bend one way. For instance, the elbow and knee joints are classed as hinges, and tend to move forward and backwards like door hinges.
Hinge joints are found at the elbow and knee and they only allow movement in one direction or in only one plane.
# Hinge joints allow movement in one direction, as seen in the knees and elbows. # Pivot joints allow a rotating or twisting motion, like that of the head moving from side to side. # Ball-and-socket joints allow the greatest freedom of movement. The hips and shoulders have this type of joint, in which the round end of a long bone fits into the hollow of another bone.
sliding friction is when you are sliding
The shoulder is one of the best known "ball-&-socket joints." It is a freely moveable joint.
Waves may bend if they move from one medium to another.
Different types of joints
Railroad tracks can bend when they get hot. Train tracks have a small gap where one rail meets the next rail. These are called expansion joints. When it is hot the rails expand making the gap smaller, and when it is cold the rails contract making the joints wider. If the expansion joints are not wide enough and the rail gets hot enough it will expand more than the expansion joint can handle and the rails can buckle. In other situations the rails can get what are called sun kinks and the rails actually bend out of alignment.