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forces act on everything around us all the time. usually more than one force is acting upon the a object at a time. gravity pulls you towards the earth. you can measure forces using a spring balance. a stiff spring in the balance stretches when an object pulls on it. forces on a spring balance are measured in newtons (N). the force of 100 grams is the equal to 1 newton,
forces cause objects to:
-begin to move
-speed up
-slow down or stop moving
-change direction
-change shape
-remain still

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Balanced Force: There are many forces around us but most of them do not cause movement.

Unbalanced Force: Unbalanced forces are also very important, Consider the forces acting up the barbell.

Evidence of unbalanced force: There are three ways that you can tell if a force is unbalanced. Forces are unbalanced if there is a change of speed, direction, or shape of an object. If a ball is resting on the ground, then all the forces are balanced. If two people are pushing equally on a stationary object, then the forces are balanced and the object does not move.

Representing forces: Force diagrams can be represented using an arrow. A short arrow shows a weak force and a long arrow shows a strong force

Forces can be added together: If you tried to lift a heavy object such as a piano, you would not be successful because that upward force you exert on the piano would be too weak

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game war rope casual stock team championships pull war game rope pulling war day

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7.3: forces can be contact or non-contact

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7.3: forces can be contact or non-contact

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some forces make objects move because of a push or pull. it is easier to move a pencil if you push it with your finger. this is called a contact force.

some forces cause movement without touching. when a magnet is held near a metal paper clip, the paper clip is pulled towards the magnet. these are called non-contact forces.

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When two objects rub together, there can be a build - up of negative charges on one object. This causes other objects to be pushed away or pulled towards it. This is known as an electrostatic force.

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7.6: friction slows down moving objects.

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7.6: friction slows down moving objects.

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Grip prevents the shoe from sliding when they run and stop. The grip provides friction between the ground and the wearer. friction slow everything down that is moving. anytime a movement slows down, it's because of friction.