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Forces and Effects
Q and A about forces and their effects
Question | Answer |
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Name 3 things in which a force can do to a ball. | They can make the ball move, make the ball stop, make the ball change directions, make the ball increase the speed, change the shape of the ball. |
Define: synthetic | man-made/ artificial |
How do you measure forces? In what measurement? | Using a Newton spring balance. Using the measurement: N= Newtons |
Define the two main types of forces: contact force and non contact force. | Contact force- when the object or material exerting force touches the object or material. Non-contact force- when the object or material does not touch each other. |
What are the two contact forces? Define each of them. | [impact force- when a movie object collides with a stationary object, the impact force is exerted by one object to another][strain force-hen elastic materials are squashed,stretched, twisted or bent they exert a force which acts in the opposite directions |
What are the 3 non-contact forces? | magnetic force, electrostatic force and gravitational force |
What happens when a north and north pole are put together? Why? | similar poles repels - your hands will be pushed apart |
What happens when a south and north poles are put together? Why? | different poles attract each other - your hands will be brought closer. the same goes to electrostatic force. |
What is the purpose of a 'stop' on spring balances? | prevents the spring from stretching beyond its elastic limit |
Why would a spring balance without a stop give wrong readings for the weights of the masses hung from it if large masses were used? | the string would is stretched so much until it remained slightly stretched. The spring had gone beyond a point called the elastic limit and is permanently deformed. The spring no longer extends in proportion to the mass, giving wrong readings |