The first set of the following links shows many excellent activities and infographics in pdf format which you can download completely free. The second set presents the different groups (by subject) of the worksheets, interactive activities, labs, physics videos, and physics problem solving software created bt Ceres Science and found in Teachers Pay Teachers (TpT). The third group of links will take you to TpT, where you can view one by one the different products available, and also search and download dozens of free complete activities. In Teachers Pay Teachers we have more than 5,000 products at prices that teachers can really afford.
Free Science Activities and Infographics by DK Publishers, Ceres Science, and Others: