Every physics student knows the feeling. You’ve survived the vectors of Unit II and limped through the free-body diagrams of Unit III. You think you’re getting the hang of it. Then, your teacher hands you Unit IV Worksheet 4 .

cap F sub x equals cap F sub p u s h end-sub center dot cosine open paren 20 raised to the composed with power close paren equals 25 N center dot cosine open paren 20 raised to the composed with power close paren is approximately equal to 23.5 N Acceleration (

If you have completed Worksheet 4 but want to check your work:

While specific numbers vary by teacher, most "Worksheet 4" assignments follow this pattern: 1. The "Standard Slide" (Horizontal Acceleration) A box (e.g., ) is pulled across a floor with a horizontal force of . Friction is The Question: Find the acceleration. The Process: Fnetcap F sub n e t end-sub

Force is a vector. If you have a force going down or left, it must be negative in your summation.