Forces and Effects
Q and A about forces and their effects
|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