Please get out your SISN Have a pencil and Glue stick Forces Please get out your SISN Have a pencil and Glue stick

Why do “The Swimmers” look as though they are moving? Watch the following video and discuss the following questions! Why do “The Swimmers” look as though they are moving? https://www.youtube.com/watch?v=gjutJ_C8Wj8

How can you tell motion has occurred?

We use our surroundings to help us determine motion We use our surroundings to help us determine motion. The surrounding objects that are used to determine motion are called reference points!

How can you tell the person on the bike is in motion How can you tell the person on the bike is in motion? What can we use as a reference point?

What is in motion in the picture below What is in motion in the picture below? How did you know it was in motion?

Now that we know what motion is and how to determine motion has occurred. Now we can start thinking about how we make things move.

What is a force? A push or a pull exerted on an object in order to change the motion of the object; force has size and direction.

Changes in the force Forces cause changes in motion. A force can change acceleration. This can be a change in the speed or direction of an object.

Newton The unit for force is called a Newton. The symbol is, N.

Forces Acting on Objects All forces act on objects. An object must receive a push or pull. Just because a force acts on an object does NOT mean that motion will occur.

Net Force The combination of all of the forces acting on an object is called the net force.

Same direction If the forces are going in the same direction, the forces are added together to determine the net force.

Different direction If the forces are going in a different direction, forces are subtracted to determine the net force.

Balanced forces Forces are balanced when the forces on an object produce a net force of 0 N. Balanced forces DO NOT cause a change in motion.

Examples of Balanced Forces What are some that you can think of? Ex. House of cards

Unbalanced forces Forces are unbalanced when the net force on an object is not 0 N. Unbalanced forces produce a change in motion.

Examples of unbalanced forces What are some that you can think of? Ex. Action in sports

Calculating net force If the forces are going in the SAME direction, you will ADD.

Calculating net force If the forces are going in the OPPOSITE direction, you will SUBTRACT.

Practice on YO OWN!

Will motion occur?

Will motion occur?

Will motion occur?

Motion Review Reference Point: https://www.youtube.com/watch?v=sA2zYD2A45c

Newton’s laws of motion: https://www.youtube.com/watch?v=YyJSlcIbd-s https://www.youtube.com/watch?v=1Ih1TZF4tPY