1 What is used in cycle brakes to increase friction
2.Which substance is used in the machine parts to reduce friction?
3.Where in the endocrine glands release their secretion?
4. What is the distance travelled by an object in unit time called?
5. Which force stops the ball having rolling motion ?
Answers
Explanation:
Answer Is Given Here
Brake pads
Answer. Brake pads are used in cycle brakes to increase friction.
Friction can be minimized by using lubricants like oil and grease and by using ball bearing between machine parts. A substance that is introduced between two surfaces in contact, to reduce friction, is called a lubricant. Fluid friction can be minimized by giving suitable shapes to the objects moving in the fluids.
The pancreas, located in the abdomen, below and behind the stomach, is both an exocrine and an endocrine gland. The alpha and beta cells are the endocrine cells in the pancreatic islets that release insulin and glucagon and smaller amounts of other hormones into the blood.
The distance covered by an object in a unit of time is called the speed of the object. The formula for speed can be written as the total distance covered divided by the total time taken. Thus, speed equals total distance covered divided by the total time taken to cover the distance.
The force of friction acts between the two surfaces by opposing the relative motion of one surface over the other. For example, when the ball rolls on the ground, the force of friction acts between the surface of the ball and the surface of the ground.
1)We deliberately increase friction by using brake pads in the brake system of bicycles and automobiles. When you are riding a bicycle, the brake pads do not touch the wheels. But when you press the brake lever, these pads arrest the motion of the rim due to friction. The wheel stops moving.
2)Lubricants: The lubricant can be defined as the substance which was introduced to reduce the friction between the surfaces in the mutual contact and also reduces the heat generated. It is used in machines and the other moving parts which reduces the friction.
3)Endocrine glands are ductless and release their secretions directly into the intercellular fluid or into the blood. A collection of endocrine glands makes up the endocrine system: the pituitary (anterior and posterior lobes), thyroid, parathyroid, adrenal (cortex and medulla), pancreas and gonads.
4)The distance travelled by an object in unit time is known as its speed.The speed of a moving object is indicated by its speed.
5)The force of friction acts against the motion of the ball.