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Grade 6
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Forces and Newton’s First Law

Force is a pull or exerted by one object on another. You can use a spring to measure force. It’s marked off in units called . Some forces oppose the of objects in contact with a surface. This is called . If you pull a block across a table, you’ll feel a drag along the surface. This is friction acting on the block. Objects remain stationary in slanted surfaces due to friction. You can skate along a sidewalk because of friction. Friction between the skate wheels and the pushes you ahead. Friction acts anytime surfaces of objects are in .