Motion & Mechanics

A:

Diffraction occurs when a wave bends around objects. Diffraction is also said to occur when a wave spreads after it has passed through a type of gap.

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  • What Was Marconi Guglielmo Famous For?

    Q: What Was Marconi Guglielmo Famous For?

    A: Italian born Guglielmo Marconi was most famous for inventing and transmitting the first wireless signals across the Atlantic Ocean. According to the Nobel Prize Organization, in 1900, Marconi received his famous patent number 7777 for tuned or syntonic telegraphy.
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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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  • When Is Friction Unwanted?

    Q: When Is Friction Unwanted?

    A: Friction is unwanted in any situation in which free and continuous motion of mechanical parts is necessary. Some examples include the moving parts inside of an engine, door hinges and water slides.
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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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  • What Is the Difference Between Balanced and Unbalanced Forces?

    Q: What Is the Difference Between Balanced and Unbalanced Forces?

    A: Balanced forces are forces that produce no change in motion, while unbalanced forces produce some type of acceleration. With balanced forces, any forces in a given direction are exactly matched by forces in the opposite direction. With unbalanced forces, the forces in one direction are greater than those in the opposite direction, resulting in a net force that produces acceleration.
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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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  • What Is Gravitational Pull?

    Q: What Is Gravitational Pull?

    A: 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 Kinetic Friction?

    Q: What Is Kinetic Friction?

    A: Kinetic friction refers to the frictional force of a moving object. If a force is being applied on a stationary object, friction is considered a static force until movement occurs.
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  • How Did Newton Discover Gravity?

    Q: How Did Newton Discover Gravity?

    A: Sir Isaac Newton discovered gravity around 1665 while he was drinking tea and observed an apple falling from a tree. Newton deduced that the force that caused the apple to fall to the ground also is the same force that causes the moon to orbit the earth.
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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 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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  • 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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  • 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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  • Why Do Some Objects Float in Water and Others Sink?

    Q: Why Do Some Objects Float in Water and Others Sink?

    A: Objects comprised of material that is denser than water tend to sink; objects with a lighter density tend to float. Since air is lighter than water, hollow objects can float if their total density is less than water. Preventing objects from absorbing water is important.
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  • What Are the Different Types of Force?

    Q: What Are the Different Types of Force?

    A: Forces are broadly classified into two categories: contact forces, which are required to make contact with the object in order for them to work, and action-at-a-distance forces, which can act on objects placed at a distance. Contact forces include applied force, frictional force, normal force, spring force, tension force and air resistance. Action-at-a-distance forces include gravitational force, magnetic force and electrical force.
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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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  • What Are Compound Machines?

    Q: What Are Compound Machines?

    A: A compound machine is a machine composed of two or more simple machines. Common examples are bicycles, can openers and wheelbarrows. Simple machines change the magnitude or direction of a force without any motor.
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  • What Is an Example of Kinetic Energy?

    Q: What Is an Example of Kinetic Energy?

    A: Because any moving thing or object has kinetic energy, there are many examples of this energy type, including a ball dropping into water, a car in motion and a moving arrow. However, there are different types or forms of kinetic energy.
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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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  • How Does Gravity Affect Weight?

    Q: How Does Gravity Affect Weight?

    A: Gravity affects weight because gravity creates weight. Objects have mass, which is defined as how much matter an object contains. Weight is defined as the pull of gravity on mass.
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  • What Speed Breaks the Sound Barrier?

    Q: What Speed Breaks the Sound Barrier?

    A: Breaking the sound barrier requires exceeding the speed of sound, which is approximately 761 miles per hour at seal level when the air temperature is 59 degrees Fahrenheit. As the temperature decreases, the speed of sound also decreases.
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