a unit of force is ____ the speed of a car is shown by a ____ position, speed and direction can describe ____ we use a ____ to measure a force the larger the force applied, ____ the extension of the spring a magnetic has ____ plastic, rubber, wood and glass are ____ materials if north pole of a magnet close to south pole of another magnet, it will ____ each other miss etti's mass is 50 kg on the Earth, but her mass is ____ lift a box up, mop the floor, sweep the floor are ____ force gravity, electric, magnet force are ____ forces a thing can stop easily on the ____ surface when we rub our hands together it produces ____ force friction force can ____ a moving object we ____ be separated steel clips and aluminium balls

primary 4

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