ForcesBalanced and

unbalanced; Newton’s laws of

motion

http://chburrellscience.weebly.com/uploads/1/2/2/0/12209425/7764377_orig.jpg

Force

Is any kind of a push or a pull on an object

Has magnitude and direction

https://media.studyisland.com/pics/165569_ca21602526.png

Daniel and Maria wins!

2 Newtons to the right

Balanced forces

Resultant or Net Force is zero

Unbalanced forces

Resultant or Net Force is NOT zero

Unbalanced forces

How will unbalanced forces affect objects at rest?

How will unbalanced forces affect objects already in motion?

Concept check10 N

10 N10 N5 N

5 N 10 N

5 N

Law of Inertia Every object continues in its state of rest, or of uniform velocity, in a straight line, as

long as NO NET FORCE acts on it.

Mass

Is a measure of the inertia of an objectIs a property of an object itself

http://blog.timesunion.com/opinion/files/2011/04/0426_WVinequality.jpg

Law of AccelerationThe acceleration of an object is directly proportional to the NET FORCE acting on it, and is inversely proportional to its MASS.

The object accelerates in the same direction as the NET FORCE acting on the object.

http://www.met.reading.ac.uk/pplato2/h-flap/phys2_3f_1.png

Law of Acceleration

𝑎=∑ 𝐹𝑚

Law of Acceleration

∑ 𝐹=𝑚𝑎

Law of InteractionWhenever one object exerts a force on a

second object, the second exerts an equal force in the opposite direction on the first.

Force of gravity on book

Push of table on book

http://www.lib-ebook.com/images1/28262/img35.jpg

Balanced forces

Weight of book

Push of table

http://www.lib-ebook.com/images1/28262/img35.jpg

Action-reaction forces

Concept checkhttps://rfe5960.files.wordpress.com/2011/02/horse-cart.jpg

References

Giancoli. Physics, 5th ed.