Motion & Mechanics

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The law of inertia states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. The law of inertia is sometimes referred to as Newton's first law of motion.

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  • What is the difference between absolute and relative location?

    Q: What is the difference between absolute and relative location?

    A: Absolute location is a place's exact spot on a map, while relative location is an estimate of where a place is in relation to other landmarks. Absolute location is defined by latitude and longitude measurements. Relative location is used in conversational language and for giving rough directions.
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  • How does a petrol engine work?

    Q: How does a petrol engine work?

    A: Petrol engines harness the energy created by petrol in the core of a car engine to propel the vehicle. Petrol is a high-energy fuel that releases large amounts of energy when ignited in an internal combustion engine.
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  • What kind of simple machine is a pair of scissors?

    Q: What kind of simple machine is a pair of scissors?

    A: A pair of scissors is two levers put together. With this simple machine, less force is needed because a greater distance is involved. Other types of levers include a see-saw, a hammer, a fork and a baseball bat.
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  • What is the meaning of "swept volume"?

    Q: What is the meaning of "swept volume"?

    A: "Swept volume" is defined as the volume of fluid through which a piston or plunger moves when it makes a stroke in an engine, according to Oxford Dictionaries. The swept volume times the number of cylinders in an engine is known as the displacement, usually measured in liters. Calculating the swept volume is done by multiplying pi times the radius squared times the height of the chamber.
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  • Does length affect the period of a pendulum?

    Q: Does length affect the period of a pendulum?

    A: The length of the pendulum is directly correlated to its period as per the pendulum equation: T = 2π√(L/g), where T is the period of the pendulum, L is its length, and g is the gravitational constant 9.8 m/s2. Regardless of the weight of the pendulum bob, otherwise known as the weight at the end of the string, the deciding factor of the period of the swing is length, as it is the only variable in the stated equation.
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  • How much helium is needed to lift 10 pounds?

    Q: How much helium is needed to lift 10 pounds?

    A: One cubic foot of helium can lift 0.062 pound, so 161.3 cubic feet of helium is needed to lift 10 pounds. A balloon containing this amount of helium must be approximately 6.75 feet in diameter at sea level.
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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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  • How do I define "polarity of water?"

    Q: How do I define "polarity of water?"

    A: The polarity of water is the net result of the overall negative charge of the oxygen atom and the overall positive charges of the two hydrogen atoms. The outcome is a difference in charge, or polarity, from one end of the molecule to the other.
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  • How do you find velocity?

    Q: How do you find velocity?

    A: Velocity is found by dividing the total amount of space an object moved by a measurement of time and combining that with the direction it moved. Velocity is a vector, and speed is only part of this vector.
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  • How does a pulley system work?

    Q: How does a pulley system work?

    A: According to Teach Engineering, a pulley system helps to perform work by switching directions of force and simplifying the movement of large objects. Different types of pulley systems include fixed, movable and multiple.
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  • How do levers work?

    Q: How do levers work?

    A: HowStuffWorks explains that levers work by reducing the force needed to move weights. They achieve this by increasing the distance through which the required force acts. For instance, a 1-kilogram force that acts through a distance of 3 meters is capable of moving a 3-kilogram weight in 1 meter, if friction is ignored.
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  • What are the main branches of mechanics?

    Q: What are the main branches of mechanics?

    A: The two main branches of mechanics are statics and dynamics. Static mechanics is the study of forces which are required to keep a body in equilibrium. Dynamics is the study of motion itself, and the forces producing it.
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  • Why do ships float on water?

    Q: Why do ships float on water?

    A: Ships float because they displace enough water for the buoyancy force to be greater than the force of gravity acting on the ship. The displaced water attempts to return to its original position, now occupied by the ship, which pushes the ship up. This effect is known as buoyancy force. The strength of the force of gravity pulling down on the ship is affected by its weight. Whichever of these forces is stronger determines if the ship floats or sinks.
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  • What is the definition of hydraulic pressure?

    Q: What is the definition of hydraulic pressure?

    A: The definition of hydraulic pressure is that of a force per unit area that is measured in pounds per square inch (PSI). Dynamic pressure and static pressure are the two pressure components.
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  • What class lever is a stapler?

    Q: What class lever is a stapler?

    A: A stapler is an example of a second class lever. Levers are designated as second class if the load is situated between the fulcrum, or pivoting point, and the point where effort, or force, is applied.
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  • How much pressure can an egg withstand?

    Q: How much pressure can an egg withstand?

    A: An experiment conducted at the Science Studio at Imagination Station demonstrated that a single egg was able to withstand at least 3.75 pounds of force. Eggs are most resistant to breaking when pressure is applied to their ends.
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  • What is the difference between hydraulics and pneumatics?

    Q: What is the difference between hydraulics and pneumatics?

    A: The difference between hydraulics and pneumatics is the medium used in each system to perform work. Hydraulics employ fluids, such as oils, while pneumatics utilize compressed gases, such as carbon dioxide or atmospheric air.
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  • How does a petrol pump work?

    Q: How does a petrol pump work?

    A: A petrol pump works by using a diaphragm that pressurizes gasoline, according to Second Chance Garage. The gas transfers from the pump and through fuel line, until it reaches the carburetor.
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  • What are some achievements of Isaac Newton?

    Q: What are some achievements of Isaac Newton?

    A: Some of Sir Isaac Newton's achievements include defining the law of gravity and the three laws of motion, inventing the reflecting telescope, defining theories of light and color and inventing calculus. Newton was a philosopher, mathematician and physicist who played an important role in the scientific Revolution of the 17th century.
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  • What is simple harmonic motion?

    Q: What is simple harmonic motion?

    A: In physics, simple harmonic motion refers to repetitive oscillation back and forth through a central or equilibrium position. A pendulum is a good example of a physical system that exhibits simple harmonic motion. The time taken to complete one full oscillation is called a time period.
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  • How do you calculate net force?

    Q: How do you calculate net force?

    A: To calculate the net force, or unbalanced force, of a Newtonian object, find the sum of all forces presently acting upon it. These include gravity, friction and other forces depending on the scenario. You need only a few figures and computations to calculate an object's net force, which is required for acceleration and is expressed in Newtons.
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