Test Quizziz: Science Ch.11

Why do we still rock out with Newtonian mechanics when studying motion today?

• Because it's the only theory in town

• Because it nails it for our everyday speeds and sizes

• Because it's a piece of cake to get

• Because it's totally rad at the speed of light

Answer explanation

Newtonian mechanics is still used today because it is accurate for everyday speeds and sizes, making it a practical and reliable choice for studying motion.

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Imagine you're chilling on your couch, absolutely still. Guess what? You're still zooming through space! According to which frame of reference is this wild ride happening?

• Relative to the Galaxy

• Relative to the Earth

• All of the above

• Relative to the Sun

Answer explanation

Even when sitting still, you are moving relative to the Galaxy, Earth, and Sun due to their own movements. Hence, the correct answer is 'All of the above'.

Let's dive into the world of physics! Can you tell when momentum in a system stays the same, as if by magic?

• There are no external forces

• It is in a vacuum

• It is moving at constant velocity

• It is at rest

Answer explanation

Momentum in a system is conserved when there are no external forces acting on it, allowing the total momentum to remain constant.

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Imagine you're a superhero, soaring through the skies! Suddenly, you drop your favorite gadget. How fast does it accelerate towards the ground in this epic free fall near Earth's surface?

• 10 km/h

• 10 m/s

• 9.8 km/h^2

• 9.8 m/s^2

Answer explanation

The correct acceleration for objects in free fall near the surface of the earth is 9.8 m/s^2.

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Imagine you're on a merry-go-round, what kind of special acceleration are you experiencing?

• Acceleration in a straight line

• Constant acceleration

• Acceleration towards the center of the circular path

• Acceleration away from the center of the circular path

Answer explanation

Centripetal acceleration is the acceleration towards the center of a circular path, keeping an object moving in a curved trajectory.

Imagine you're a superhero, and your power is to control vectors! Remember, a vector has both a magnitude & direction. Is this true?

• Only in the world of comics

• Depends on the superhero

• That's a myth

• Absolutely true

Answer explanation

Vectors consist of both magnitude and direction, making the statement true.

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Imagine you're on a thrilling amusement park ride, zooming around in a circle at a steady speed - would you believe it's still accelerating?

• Only at the top of the ride

• Only at the bottom of the ride

• True

• False

Answer explanation

The statement is true because even though the speed is constant, the direction of the velocity is changing, indicating acceleration towards the center of the circular motion.

Imagine you're in space, floating around! How would you move according to Newton's first law of motion?

• 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

• For every action, there is an equal and opposite reaction

• The force acting on an object is equal to the mass of that object times its acceleration

• Energy cannot be created or destroyed in an isolated system

Imagine you're a superhero! What superpower does 'inertia' give you?

• The superpower to resist changes in your flying speed

• The ability to change the momentum of objects with a snap

• The strength to pull objects towards you with gravity

• The capacity to know how much matter is in something just by looking

Ready to test your physics prowess? Let's dive into the world of forces! What is the unit of force in the International System of Units (SI)?

• Kilogram (kg)

• Meter (m)

• Newton (N)

• Second (s)