# force and motion class 7 questions and answers

answered 2 minutes ago in Force and Motion by Zabya (25.8k points) It is used to separate iron from mixtures of dust particles and other non- magnetic substances. TopperLearning’s NCERT Solutions for CBSE Class 9 Physics Chapter 9 Force and Laws of Motion are one of the best study materials for revision. Force and Motion Introduction. 25 m/s to 30 m/s. It slows down the motion of moving part of the body. Then, push the chair and table separately. What do you conclude from this activity? A body is said to be in uniform velocity if it covers the equal distance in equal interval of time in a fixed direction. To open the window we use a force. By using formula, Speed = $$\frac{ distance travelled}{ Time taken}$$ = $$\frac{500}{30}$$ = 16.67m/s $$\therefore$$ The speed of the car is 16.67m/s. Fill in the blanks in the following statements. Extra Questions for Class 9th: Ch 9 Force and Laws of Motion (Science) Important Questions Answer Included Very Short Answer Questions (VSAQs): 1 Mark Q1. The force, which acts between any two objects because of their masses, is called gravitational force. Recent questions and answers in Force and Motion 0 votes. Q. Check Video's Description for All Theoretical Questions Answer. Question 1. What is the reason behind it ? Practice with these questions to get higher marks in the Class 9 Science Exam. Questions and Answers. Scoring marks in Physics can be easier if you understand the questions and answers clearly. Pulling force can be defined as the force that pulls or tries to pull an object. This force is called friction or force … Then, rub your scale on your hair for some time. Mention the real life applications of centre of gravity. It is the force that pulls or tries to pull an object. Velocity-time graph of an object is given below the object has (a) uniform velocity (b) uniform retardation (c) uniform speed (d) variable retardation, The slope of a velocity-time graph gives (a) velocity (b) distance (c) displacement (d) acceleration, A car is moving along a straight road with uniform velocity which is the correct representation, Average speed of a moving object is equal to the magnitude of its average velocity when it travels. Question 1. In the machine where possible, sliding friction can be replaced by rolling friction by using ball bearings. Answer: The force acting between any two surfaces in … (a) Unable to change by itself the state … Mass have magnitude but it does not have direction, so it is a scalar quantity. The physical quantity having both magnitude and direction is called a vector quantity. Friction produces heat as both the surface are rub together. What are the differences between centripetal force and centrifugal force? Answer: 1 newton is the magnitude of force which produces an acceleration of 1 m/s2 in a body of mass 1 kg. Centripetal force and Centrifugal force:When a body moves in a circular path, it experiences two types of force on it, the force that acts towards the centre is called centripetal force while the force that acts away from the centre is called centrifugal force. It has both magnitude and directions. What do you observe? Friction always opposes the motion of a body moving on the surface of another body. During the ride, you will bend towards the centre and the mud fly off tyres of your bicycle while riding. The nails get attached with the bar magnet. Answer: A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. If a force is balanced, no movement occurs. If a body covers equal displacement in equal interval of time then the velocity is called uniform velocity.