# Forces More Options: Make a Folding Card

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• Hi I’m Freya and she's Priya. A force is a push or a pull that acts on an object. All forces are vector quantities meaning they have magnitude and direction. All forces break down into contact like air resistance and friction or long range like gravity and magnetic.
• Drag force, also known as air resistance is everywhere around us. It is a contact force, similar to friction, and it is opposes motion, often gravity.So if the force of gravity on the pen is greater than the force of gravity on the paper, the gravity will overtake the drag force and fall first.
• Friction is a contact force that opposes motion. It can be static if the person is pushing an object but the object doesn’t move anywhere. This means that the friction force is greater than the force being exerted. Or, it can be kinetic like the boy over here who is applying a greater force than the friction against the pavement.
• Freya’s throw represented a projectile. After the ball leaves her hand, the only force acting upon it is gravity. Gravity is a long range force that acts in a downward direction. You can find the force of gravity using the equation F=ma.
• When Person A pushes Person B, they use a normal force. Normal forces are contact forces and are perpendicular to the motion. Normal forces usually work opposite of gravity. For example, a book resting on the table is being pulled to the earth by gravity, however the normal force stabilizing it allowing it to stay in it’s current position. Normal forces can also be calculated using the equation F=ma.
• The swing is able to hang from the pole because of the tension force exerted by the chain. Tension forces are contact forces and they are parallel to the rope or in this case chain. If the mass of the person sitting on the swing is less than the tension force, then said person can swing freely.
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