Balanced & Unbalanced Forces Review

Vocabulary Matching Match the correct word to the correct definition Force A push or a pull that changes an objects motion Balanced Force Separate forces that together do not change the motion of an object Unbalanced Force Separate forces that together change the motion of an object Net Force The sum of all forces acting on an object Motion A change in an object's position with respect to time and relative to other objects The world around us is governed by physical laws that we cannot always see, but have a large impact on all matter. Objects around us are sometimes in motionand are sometimes at rest, and these two states all depend on the force being exerted on those objects. When an object has balanced forces acting upon it, it does not accelerate. When an object has unbalanced forces acting upon it, it causes the object to accelerate. When an object has unbalanced forces acting upon it, you can calculate the net force acting on the object by calculating the sum of the forces that are present. Net Force Practice Calculate the netforce. Only put the NUMBER in the box. Picture #1 6 Picture #2 20 Picture #3 4 Picture #4 14 Picture #5 16 Picture #6 3 Which direction is object #1 going to move? North South West East Which direction is object #2 going to move? North South West East Which direction is object #3 going to move? North South West East Which direction is object #4 going to move? North South West East Which direction is object #5 going to move? North South West East Which direction is object #6 going to move? North South West East Ture or False Determine if the statement is True or False. Use T for true and F for false. It MUST be capitalized to be correct! A force is a push or a pull on an object T A change in motion will not occur if the net force is greater than 0 Newtons F An object with no motion is an example of unbalanced forces. F Force is measured in units called Joules F Gravity, friction, and air resistance are three common forces on Earth T Moving at a constant speed is an example of balanced forces T An object will move in the opposite direction of the greater force applied F Quickly braking to stop at a red light is an example of unbalanced forces T The force of gravity exists between all objects that have mass T A bowling ball knocking over pins is an example of balanced forces. F Complete the table. Describe the motion happening in each section, and then determine if it is balanced or unbalanced. Section Motion Balanced? Yes or No? Unbalanced? Yes or No? I Moving in a straight line at a constant speed YES NO II Increasing speed NO YES III Moving in a straight line at a constant speed YES NO IV Decreasing speed NO YES V Moving in a straight line at a constant speed YES NO Which of the following is not a characteristic of balanced forces? Equal forces Net force equals 0 Newtons Causes a change in an object’s motion Can be a push or a pull Which of the following is not a characteristic of unbalanced forces? Forces that act on objects Net force equals 0 Newtons Causes a change in an object’s motion Can be a push or a pull