force, is a push or a pull, pulling, stretching is an example of a ............. force, pushing, squeezing a wet sponge is an example of .............. force, friction, acts between two surfaces when they slide against each other, elastic, spring has ............... force, magnet, attracts magnetic materials, Newton, unit of force, spring balance, instrument to measure force, shape, crushing a metal can change the ................., mass, force cannot change the ........... of an object, speed, when a footballer kicks the ball, she changes the .............. of the moving ball, less effort, moving an object up a slope requires ......................

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