Forces
Forces
Balanced and unbalanced forces
Weight
Gravity
Floating and sinking
Friction
Air resistance
Magnets
Pressure
Levers and moments
Balanced forces-when two forces are acting on an object are equal in size but acting in opposite direction
Gravity, non contact, A force that pulls objects towards the centre of the Earth.
Friction, contact, a force that resists the sliding or rolling of one solid object over another.
Magnetism, Non contact, A force that causes some metals to be to be attached to each other.
Drag, Contact, A force that opposes the movement of a solid
Electrostatic, Non contact, they pull or push on objects without touching them
Tension, contact, the pulling force since the ropes cannot push effectively
Buoyancy, Contact, a force which pushes on objects in liquids making them float.
Unbalanced forces when two forces acting on an object are not equal in size.
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Weight= Gravity x mass
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Weight is the force on an object
Weight = Gravity x mass
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Gravity = weight / mass
An object floats when the weight force on the object is balanced by the upward push of the water on the object. If the weight force down is larger than the upward push of the water on the object then the object will sink.
Whenever an object moves agents another object, a friction force is created. Friction force act in the opposite direction to the movement. Friction makes it more difficult for to move. There are two types of friction grip and slip.
Air resistance is a type of friction caused by particles hitting the suface of an object.
When the North Pole and the South Pole are placed together, the magenets are attached to each other.
When the North Pole and the North Pole are placed together, the magenets are replelling to each other
Lever- something that moves around in a pivot.
Pivot - is the point around which the object turns
Load - a force of the object being lifted
Effort-the force being applied to lift an object
Pessure = force/area