Motion & Mechanics

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Gravitational pull is the invisible force that causes massive objects to pull other objects towards them. For instance, when a person jumps up in the air, it is the earth’s gravitational pull that causes him to return to the ground. All massive objects have gravity, and the bigger they are, the more gravitational pull they produce.

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  • What is the function of a mortar and pestle?

    Q: What is the function of a mortar and pestle?

    A: A mortar and pestle is used to grind fresh herbs and spices. These freshly ground herbs and spices can be used in cooking or in home health remedies.
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  • How does a water turbine work?

    Q: How does a water turbine work?

    A: Water turbines convert the motion of moving water into rotating mechanical energy by catching the water with large blades. They are important to the structure and function of hydropower plants. There are different models of water turbines, but all perform the same basic function of converting the energy of the moving water into the revolutions of a shaft.
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  • What is a first-class lever?

    Q: What is a first-class lever?

    A: A first-class lever is a beam, rod or stick with the load at one end, the fulcrum in the middle and the force applied on the other end. A good example of a first-class lever is a child's see-saw.
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  • What are types of potential energy?

    Q: What are types of potential energy?

    A: Potential energy is the stored energy of an object that has the potential to change to a different form of energy to do work. The types of potential energy are gravitational, elastic, chemical, electric and nuclear.
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  • What are the types of acceleration?

    Q: What are the types of acceleration?

    A: There are three types of acceleration in general: absolute acceleration, negative acceleration and acceleration due to change in direction. Acceleration is defined as the rate of change of velocity.
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  • Why can't liquids be compressed?

    Q: Why can't liquids be compressed?

    A: Liquid compression is difficult but not impossible because they feature a mid-level intermolecular force that makes their molecules difficult to compress. Intermolecular force is the strength used to hold molecules tightly together or force them apart. The strength of the intermolecular force depends on the state of the matter, with solids having the strongest intermolecular force and gases having the weakest intermolecular force.
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  • What is a non-Newtonian fluid?

    Q: What is a non-Newtonian fluid?

    A: Non-Newtonian fluids are those that behave differently than Newtonian fluids do with regard to viscosity. Typically, stress causes non-Newtonian fluids to alter their flow patterns or viscosity. The stress can cause the viscosity to increase or decrease, depending on the particular non-Newtonian fluid.
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  • How does streamlining reduce air resistance?

    Q: How does streamlining reduce air resistance?

    A: Streamlining reduces air resistance by providing a smooth surface over which air flows easily and uniformly. Without streamlining, eddies formed on the trailing edges of objects create turbulent, low-pressure areas and increase air resistance, also known as drag.
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  • How is wind energy used today?

    Q: How is wind energy used today?

    A: Wind energy is mainly used to generate electricity. The main instrument used to capture this energy is the wind turbine, which is comprised of three or four rotating blades connected to a drive shaft. Wind flows over the blades of the wind turbine, causing them to turn. This kinetic energy from turning is converted to electrical energy for transmission to homes and businesses.
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  • How does temperature relate to kinetic energy?

    Q: How does temperature relate to kinetic energy?

    A: Temperature is directly proportional to the average kinetic energy of the molecules in a substance. If the degree of motion of the molecules inside an object doubles, the temperature will also double.
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  • Which awards were given to Isaac Newton?

    Q: Which awards were given to Isaac Newton?

    A: Sir Isaac Newton was awarded many honors during his life, mostly in the form of titles and positions. In addition to serving as a member, and later president, of The Royal Society, Isaac Newton served as a member of Parliament and professor at Cambridge University. The mathematician and astronomer invented calculus, defined universal laws of motion and gravity, and made discoveries in astronomy and chemistry.
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  • What is an example of elastic force?

    Q: What is an example of elastic force?

    A: An example of elastic force is bungee jumping. The elastic cord creates resistance and imposes a force when the cord is stretched far enough. That elasticity creates the bouncing motion a bungee jumper feels after the initial jump, while the cord works to return to its normal size.
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  • What is gravity?

    Q: What is gravity?

    A: Gravity is a type of force that attracts objects to one another. Objects with more mass have more of a gravitational pull than those with less mass. The pull of gravity also depends on the distance between two objects. The farther away an object is, the less gravitational pull it exerts.
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  • How does weight affect friction?

    Q: How does weight affect friction?

    A: Weight affects friction in that friction is directly proportional to the weight of the load one is moving. If one doubles the load being moved, friction increases by a factor of two.
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  • Is air considered a fluid?

    Q: Is air considered a fluid?

    A: Air is a fluid because the force needed to deform it depends on how fast it is deformed, not on how much it is deformed. This differs from a solid, where the force needed to deform it remains the same whether it is done quickly or slowly.
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  • What is potential energy?

    Q: What is potential energy?

    A: Potential energy is defined as the energy possessed by a body due to its position or height above the surface of the Earth. Water stored in a dam has potential energy. This potential energy has the capacity to do work.
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  • What is the conclusion of projectile motion?

    Q: What is the conclusion of projectile motion?

    A: Projectile motion is concluded when a projectile stops moving. Assuming nothing gets in the way, that conclusion is reached when the projectile comes to rest on the ground.
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  • What is a mechanical governor?

    Q: What is a mechanical governor?

    A: The mechanical governor in an engine uses flyweights and gears in the crankcase to sense the speed to detect changes in the load and increases or decreases the throttle accordingly. According to Briggs and Stratton, a governor is like a car's cruise control system, as it keeps the engine running at the same speed.
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  • Why does cork float on water?

    Q: Why does cork float on water?

    A: Corks float on water because it contains a lot of air making it less dense than water. Solids and liquids with less density float on denser liquids.
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  • What is weightlessness?

    Q: What is weightlessness?

    A: Weightlessness, or microgravity, occurs when an object is in free fall, explains the U.S. National Aeronautic and Space Association. Gravity pulls the object in free fall at a faster rate due to the equivalence of the force of gravity to acceleration.
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  • How does a pulley make work easier?

    Q: How does a pulley make work easier?

    A: A pulley makes work easier by redirecting and amplifying force. It helps reverse the direction of an individual’s lifting force. As a user pulls a rope down, the pulley lifts the weight up. When two ropes and wheels are used, a pulley reduces the effort needed to lift a weight by half.
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