Twisted Forces

Beth Kappus

Frank Gulla

MathScience Innovation Center

Newton’s 3 Laws

B. Davis, L. Blackburn & R. HawleyMathScience Innovation Center

Newton’s 3 Laws

• Sir Isaac Newton• Late 1600’s England• Legend of Apple• Invented Calculus• Prism and Light• Universal Law of Gravity

Phot from http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Newton.html

1st Law: Law of Inertia

• A body at rest will remain at rest• And• A body in motion will remain in

motion• Unless…

1st Law: Law of Inertia

• A body at rest will remain at rest• And• A body in motion will remain in

motion• Unless…• Acted upon by an outside force

1st Law: Law of Inertia

• Keep on keeping on

Truck and Ladder Example

2nd Law: Law of Acceleration

• An object in motion, • when acted upon by an external

force will . . . • accelerate.

Remember: acceleration is change in speed

If a ball is rolling along the ground and you kick it . . .

2nd Law: Law of Acceleration

2nd Law: Law of Acceleration

3rd Law: Law of Reaction

•For every action,

•There is an equal but opposite reaction.

3rd Law: Law of Reaction

•Forces always

•Come in pairs

•Equal in size

•Opposite in direction

•Acting on 2 different bodies

3rd Law: Law of Reaction

Mega Micro Mini Golf

• 1st Law: Law of Inertia • 2nd Law:

Law of Acceleration• 3rd Law:

Law of Reaction

Lets review