Physical Science: Chapter 11, Section 3 Motion & Force

Forces A force is an action on an object that can ___ _______________________________________. Contact Forces: ___________________________ __________________________________________ Field Forces: ______________________________ Examples of Field Forces ________________________________ and __________________________.

Forces Four Fundamental Forces: 1. ___________________________: ___________ _________________________________________ 2. ___________________________: ___________ __________________________________________

Forces Four Fundamental Forces: 3. ___________________________: ___________ _________________________________________ 4. ___________________________: ___________ __________________________________________

Physical Science: Chapter 11 Section 3 Motion & Force Mini-Quiz #5 1). What is a force? 2). What are contact forces? 3). What are field forces? 4). Which fundamental forces of nature are field forces?

Forces ________________________Forces If all the forces are _______________, there is no “______” force and there is ____________________________________. ____________________________Forces If the forces are ________________, the “_____” force causes a _____________in the __________________.

Physical Science: Chapter 11 Section 3 Motion & Force FRICTION _________ is a force that “_________” motion; it works in the ___________________________ of a ______force applied to an object to get it to ____________.

Friction Friction in machines _____________ their ________________, making them more expensive to use and wearing them out faster. Friction in machines can be reduced by using _________________, like oil.

Friction Friction is not always a ______thing. Friction is needed for ____________________________ When needed, friction can be increased in two ways: 1. ______________________________________ 2. ______________________________________ (example: add weight above the rear wheels to increase traction.)

Two Types of Friction _____________________ Friction The force that works between two surfaces that are ___________and at ______(____________). _____________________ Friction The force that works between two _________ objects (or one that is ________and one that is __________________________).

Physical Science: Chapter 11 Section 3 Motion & Force Kinetic Friction There are two types of ____________friction: _________ Friction __________ Friction

Physical Science: Chapter 11 Section 3 Motion & Force THINGS TO KNOW What is a force? What are contact and field forces. What two forces of nature are field forces? What happens to objects when the forces on them are balanced?

Physical Science: Chapter 11 Section 3 Motion & Force THINGS TO KNOW What is friction? What are TWO ways you can increase friction? How can you reduce unwanted friction?

Physical Science: Chapter 11 Section 3 Motion & Force THINGS TO KNOW What are the two types of kinetic friction? Which type of kinetic friction is higher, sliding or rolling? Which type of friction is higher, static or kinetic?

Physical Science: Chapter 11 Section 3 Motion & Force Chapter 11, Section 3 QUIZ 1). What is a force? 2). What is a contact force? 3). What two forces of nature are field forces? 4). What happens to objects when the forces on them are NOT balanced? 5). What is friction? 6). What are TWO types of friction?

Physical Science: Chapter 11 Section 3 Motion & Force Chapter 11, Section 3 QUIZ 7). What are TWO ways you can increase friction? 8). What are TWO types of kinetic friction? 9). List TWO parts of a car that would work better without friction? 10). List two parts of a car that NEED friction.