Motion & Mechanics

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Albert Einstein's formula "E=mc2" means energy equals the mass of an object multiplied by the speed of light squared. His theory means that the mass of an object, no matter how small, can be transformed into a tremendous amount of energy.

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  • How Does Mass Affect Speed?

    Q: How Does Mass Affect Speed?

    A: Mass does not affect speed directly, but it does affect how fast an object can change its speed by accelerating or decelerating. Objects with larger masses require more time for acceleration or deceleration compared to lighter objects.
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  • What Is Gravitational Energy?

    Q: What Is Gravitational Energy?

    A: Gravitational energy is the movement of an object or mass that is caused by the pull of gravity. This is caused on Earth by the strong attraction of all other masses to be drawn back to Earth's center. An example of gravitational energy is water from a river tumbling over a cliff to form a waterfall.
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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 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 Are Radio Waves Used For?

    Q: What Are Radio Waves Used For?

    A: Radio waves are used to receive and transmit signals between two objects. These waves help to transfer signals from broadcasting stations to televisions and radios, and they are also used to transmit signals for cellular phones.
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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 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 the Difference Between Laminar and Turbulent Flow?

    Q: What Is the Difference Between Laminar and Turbulent Flow?

    A: Laminar and turbulent flows are the two major forms of fluid flow, with laminar flow being an orderly flow with all the fluid molecules moving parallel in the direction of flow, whereas in turbulent flow, different streams of fluid form eddies and unpredictable currents in a different direction than the overall direction of flow. Which type of flow arises in a fluid depends on its speed relative to its viscosity and the size and shape of the pipe or other channel carrying the fluid. Viscosity is the resistance to flow, and more inherently viscous fluids are more resistant to turbulence.
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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 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 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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  • 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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  • Why Does Wood Float on Water?

    Q: Why Does Wood Float on Water?

    A: Wood generally floats because it's less dense than the water it floats on. However, some woods are denser than water and will tend to sink.
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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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  • 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 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 Are Complex Machines?

    Q: What Are Complex Machines?

    A: A complex machine is a combination of two or more simple machines. A simple machine is one of the six basic devices that make work easier by changing the degree or direction of a force.
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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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  • What Is the Law of Acceleration?

    Q: What Is the Law of Acceleration?

    A: The law of acceleration is formally referred to as Newton's Second Law of Motion and defines the rate of acceleration as a product of the force exerted on the object and the mass of the object. The rate of acceleration increases as the net force increases. The inverse is true for mass, with the acceleration decreasing as the mass increases.
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  • How Much Force Can a Person Exert?

    Q: How Much Force Can a Person Exert?

    A: The amount of force a person can exert depends on many variables, including that person's mass, the acceleration being used to exert the force, and the friction, gravity and other forces involved. According to Live Science, researchers found that boxers' punches can generate up to 5,000 newtons of force.
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