Forces.

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Friction and Gravity.

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Presentation transcript:

Forces

What is it? A force is a push or a pull on an object Examples: Pushing a shopping cart, pulling a sled Types of Force: Balanced: forces are equal in magnitude an opposite in direction Unbalanced: forces are unequal in magnitude

Gravity Vs. WEighT Gravity: inward force toward the center of an object Apply: Gravity depends on mass and acceleration; larger objects have more mass and therefore more gravitational pull Ag = 9.8 m/s2 Weight: The amount of force applied onto a mass Apply: Objects with more mass will have more weight Fw=mag

Air resistance and Mass Amount of matter in an object Does not change Air Resistance Depends on surface area and velocity Affects gravity and terminal velocity https://www.youtub e.com/watch?v=ur40 O6nQHsw

Friction What is it: a force that opposes motion Sliding: Involves 2 objects, 1 that slides past another A box will experience less friction on a smooth surface than on a rough surface Rolling: Involves 2 objects, 1 of which has rolls Billiards Fluid: Involves 2 objects; 1 of which is a fluid Car engines Static: 2 objects which are not moving in relation to each other Tire touching the ground