Forces Use the force Luke!. Forces Difference between mass and weight: Weight is the force you put...

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Forces Use the force Luke!

Transcript of Forces Use the force Luke!. Forces Difference between mass and weight: Weight is the force you put...

Page 1: Forces Use the force Luke!. Forces Difference between mass and weight: Weight is the force you put on the Earth: In the English system we use lbs. In.

ForcesUse the force Luke!

Page 2: Forces Use the force Luke!. Forces Difference between mass and weight: Weight is the force you put on the Earth: In the English system we use lbs. In.

Forces

• Difference between mass and weight:

• Weight is the force you put on the Earth: In the English system we use lbs. In the Metric system we use Newtons.

• Mass is how much matter you are made up. We use kilograms

Page 3: Forces Use the force Luke!. Forces Difference between mass and weight: Weight is the force you put on the Earth: In the English system we use lbs. In.

Force• Pressure = Force / Area

• The bigger the area, the less the pressure, with the same force

Page 4: Forces Use the force Luke!. Forces Difference between mass and weight: Weight is the force you put on the Earth: In the English system we use lbs. In.

Force

• What is the pressure when an object with an area of 100m² is applied with a force of 100N.

• The unit of this is called a Pascal, or Pa

Page 5: Forces Use the force Luke!. Forces Difference between mass and weight: Weight is the force you put on the Earth: In the English system we use lbs. In.

Force

• Friction is a force that always works against your motion. It decreases velocity.

• Types of friction: liquids, air resistance, rough floors, etc

• There are two types of friction: static friction and sliding friction

Page 6: Forces Use the force Luke!. Forces Difference between mass and weight: Weight is the force you put on the Earth: In the English system we use lbs. In.

Force

• Static friction: the force that opposes the start of motion. When the magnitude of your push on the box is greater than the maximum value of static friction, the box moves.• Kinetic friction: The force between

surfaces of relative motion. This force is less than that of static friction.

Page 7: Forces Use the force Luke!. Forces Difference between mass and weight: Weight is the force you put on the Earth: In the English system we use lbs. In.

Force

• The coefficient of friction can usually be found with the following equation:

Where μ is the coefficient of friction. FN is the normal force and Ff is the frictional force. This formula can be used for both types of friction

Page 8: Forces Use the force Luke!. Forces Difference between mass and weight: Weight is the force you put on the Earth: In the English system we use lbs. In.

Force

• The free-body diagram: This is a way to put all of the forces together on a box to see where the motion is occurring:

• Important forces to graph:Normal force, Friction force, Weight force, Applied force

Page 9: Forces Use the force Luke!. Forces Difference between mass and weight: Weight is the force you put on the Earth: In the English system we use lbs. In.

Force

• Example pg 99

• Then example on pg 126. If you don’t have your chapter 6 packets, grab a book

Page 10: Forces Use the force Luke!. Forces Difference between mass and weight: Weight is the force you put on the Earth: In the English system we use lbs. In.

Force

• Group activity on free body diagrams and the coefficient of friction

Page 11: Forces Use the force Luke!. Forces Difference between mass and weight: Weight is the force you put on the Earth: In the English system we use lbs. In.

Force

• Homework

• Pg 95 #8, pg 100 #10a,10b, pg 102 #13,16 (use free body diagrams for this one and F=ma) and pg 126 #26 (you must attempt for full credit, +2 Extra Credit points for a correct answer)

• HW due 10/1/15