FORCES AND THEIR EFFECTSOnline version CONTACT FORCES AND NON-CONTACT FORCES. GRAVITY, MAGNETISM, FRICTION AND OTHER FORCES. by Lorena Calleja 1 As you Know, there can be contact forces and non-contact forces depending on whether the force is a result of the contact between two objects or there is no contact. But, what are contact forces? Selecciona una o varias respuestas a It is a force in which an object comes in direct (physical) contact with another object b It a a force in which an object don´t make direct contact with another object. 2 Some examples of contact forces (with physical contact) are: Selecciona una o varias respuestas a Shouting to a friend b Friction and buoyancy (flotabilidad) c Kicking a ball, opening and closing the door. d Going to the cinema 3 What are non contact forces? (There are more than one correct answer) Selecciona una o varias respuestas a They are forces that come in contact with other objetc. b They are forces that move objects without coming in contact with them. c They are also called invisible forces d Gravity and magnetism are examples of these forces. e Friction and buoyancy (flotabilidad) are examples of these forces. 4 What is magnetism? Choose the three correct answers. Selecciona una o varias respuestas a It is a contac force. b It attracts or pulls materials made of iron or steel. c It is a non contact force. d It is a force that is invisible. e Friction and buoyancy (flotabilidad) are examples of these forces. 5 GRAVITY IS.... Selecciona una o varias respuestas a A non contact force b A contact force c A force that attracts everything towards each other. d It stops everything from flying off e It causes objects to fall to the ground. 6 What will happen? Selecciona una o varias respuestas a The toy car on the smooth surface goes farther because force of friction is lesser. b The toy car on the rough surface goes farther because it has got greater friction c A force that attracts everything towards each other. d It stops everything from flying off e It causes objects to fall to the ground. 7 Did you like it? Selecciona una o varias respuestas a Yes b No c A force that attracts everything towards each other. d It stops everything from flying off e It causes objects to fall to the ground.
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