Examine the forces acting on a car on a ramp. Select the forces or force components that need to be added together to calculate the net force in the x-direction. Check all that apply.

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

Match each type of lever with the correct diagram. 1. first-class 2. third-class 3. second-class