This quiz covers key physics concepts for 8th-grade students
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1 What is the unit of force in the International System of Units (SI)?
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Joule
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Watt
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Newton
Correct!Wrong!Explanation
The unit of force in the SI system is the Newton (N). One Newton is the force required to accelerate a 1 kg mass by 1 m/s².
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2 What is the law that states "For every action, there is an equal and opposite reaction"?
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Newton's First Law
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Newton's Third Law
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Law of Conservation of Energy
Correct!Wrong!Explanation:
Newton's Third Law states that for every action force, there is an equal and opposite reaction force. This is why, for example, when you push on a wall, the wall pushes back with the same amount of force. -
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3 What type of energy is stored in a stretched spring?
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Potential energy
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Kinetic energy
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Kinetic energy
Correct!Wrong!Explanation:
A stretched spring stores potential energy. This is energy that is stored due to its position or state (in this case, the deformation of the spring).
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4 Which of the following is an example of an object with kinetic energy?
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A car parked on a hill
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A moving car
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A stretched rubber band
Correct!Wrong!Explanation
Kinetic energy is the energy of motion. A moving car has kinetic energy because it is in motion.
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5 Which of the following is an example of a non-renewable energy source?
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Solar energy
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Coal
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Wind energy
Correct!Wrong!Explanation:
Coal is a non-renewable energy source. It is formed over millions of years and cannot be replaced in a human lifetime. In contrast, solar and wind energy are renewable sources.
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6 What is the formula for calculating speed?
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Speed = Distance / Time
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Speed = Mass / Time
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Speed = Force / Time
Correct!Wrong!Explanation:
The formula for calculating speed is Speed = Distance ÷ Time. This means that speed is the distance traveled per unit of time.
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7 Which of the following forms of energy is associated with the motion of electrons
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Mechanical energy
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Electrical energy
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Thermal energy
Correct!Wrong!Explanation:
Electrical energy is associated with the movement of electrons through a conductor, such as in a circuit.
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8 Which of the following is true about the gravitational force between two objects?
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It depends on the masses of the objects and the distance between them
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It increases as the distance between the objects increases
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It is not affected by the mass of the objects
Correct!Wrong!Explanation:
The gravitational force between two objects depends on both their masses and the distance between them, as described by Newton's Law of Universal Gravitation.
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