4 – Design an experiment to demonstrate how forces affect the motion of an object. 3 – Describe and explain that an unbalanced force changes an object’s speed and/or direction. - Interpret & analyze distance-time graphs. 2 - Calculate the speed, time, and distance of a moving object. 1 – Describe how forces affect the motion of an object.

 Unbalanced forces – forces acting on an object that do not have a net force of zero.  Balanced forces – forces acting on an object that have a net force of zero.  Net force – all the forces put together.

If the forces are going in opposite directions, then subtract them. 10 N 15 N Net force = 5 N to the left If the forces are going in the same direction, then add them together. 15 N 10 N Net force = 15 N to the right

 If James pulls the box with a force of 4 N to the left and John pushes the same direction with a force of 5 N. What is the net force?

 If Cammie pushes the cart with a force of 2 N to the right and Hailey pushes the cart with a force of 2 N to the left, what is the net force?

 An object is in motion if the distance from another object is changing.  A reference point is the starting point you choose to describe the location, or position of an object.  Position is an object’s distance and direction from a reference point.

 Unbalanced forces cause an object to change its speed, direction, or both.