Explore the forces at work when pulling against a cart, and pushing a refrigerator, crate, or person. Create an applied force and see how it makes objects move. Change friction and see how it affects the motion of objects. • Identify when forces are balanced vs unbalanced. • Determine the sum of forces (net force) on an object with more than one force on it. • Predict the motion of an object with zero net force. • Predict the direction of motion given a combination of forces.