6th Grade Lesson 2 Science

A fulcrum is the support on which a lever rests while moving or lifting an object. It is the fixed point around which the lever rotates or pivots. Without a fulcrum, the lever would not be able to exert force and lift or move objects. The fulcrum provides stability and allows for the efficient transfer of force from one end of the lever to the other.

A screw is an inclined plane that is wrapped in a spiral. As the screw is turned, the inclined plane moves through a material, allowing it to be fastened or unfastened. The spiral shape of the screw increases its efficiency by providing a longer inclined plane in a compact space. This makes it easier to apply force and move objects, making the screw an essential tool in various applications such as construction, manufacturing, and household tasks.

A slanted surface refers to a wedge. A wedge is a simple machine that has a slanted surface and is used to separate or lift objects. It is typically thick at one end and tapers to a thin edge at the other. When the wedge is forced into a narrow space, it applies pressure and splits or separates the objects apart. This makes it an effective tool for cutting, splitting, or holding objects in place.

The force of an object on a lever is referred to as the load. In a lever system, the load is the weight or resistance that the lever is designed to move or overcome. It is the force that is being applied to the lever, typically located at one end, and it can be a heavy object, a load being lifted, or any other form of resistance. The load determines the amount of force required to move or balance the lever, making it an essential concept in understanding the mechanics of levers.

A lever is made of one or more bars resting on a support. It is a simple machine that consists of a rigid object (the bar) and a fulcrum (the support). When force is applied to one end of the lever, it can be used to lift or move objects at the other end. Levers are commonly used in various applications, such as seesaws, crowbars, and scissors. They provide mechanical advantage by amplifying the force applied to them.

A wedge is made of one or two inclined planes. It is a simple machine that is typically triangular in shape and is used to separate or lift objects by applying force to the wide end. The inclined planes on the wedge allow for the conversion of a smaller force over a longer distance into a larger force over a shorter distance, making it easier to perform tasks such as splitting wood or holding objects in place.

The correct answer is "effort force." In the context of a lever, the effort force refers to the force that is applied at the end of the lever to lift a load. This force is typically exerted by a person or a machine to overcome the resistance or weight of the load. By applying the effort force at a suitable distance from the fulcrum, the lever can amplify the force and make it easier to lift the load.

An inclined plane is a simple machine that consists of a flat surface that is tilted at an angle. It is often used to make it easier to move objects to a higher or lower level. In the case of a light bulb, the bottom part is typically designed with an inclined plane to make it easier to screw the bulb into a socket or fixture. By turning the bulb on the inclined plane, the threads on the bulb and socket interlock, allowing for a secure connection. Therefore, the correct answer is inclined plane.

The given question asks for the definition of a grooved wheel with a rope or chain around it. This description matches the concept of a pulley. A pulley is a simple machine that consists of a wheel with a groove, and it is used to change the direction or magnitude of a force. By wrapping a rope or chain around the grooved wheel, it allows for the lifting or lowering of objects with less effort. Therefore, the correct answer is pulley.