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Quizzes > High School Quizzes > Science

Examen de Física Noveno: Quiz de Práctica

Practica conceptos y mejora tu rendimiento escolar

Difficulty: Moderate
Grade: Grade 9
Study OutcomesCheat Sheet
Paper art representing a trivia quiz for 9th-grade physics students to self-assess and reinforce knowledge

A car travels 100 meters in 5 seconds. What is its average speed?
20 m/s
5 m/s
15 m/s
25 m/s
The average speed is calculated by dividing the total distance by the total time. Thus, 100 m / 5 s = 20 m/s.
Which of the following quantities has both magnitude and direction?
Speed
Acceleration
Mass
Distance
Acceleration is a vector quantity because it has both magnitude and direction. In contrast, speed, mass, and distance are scalar quantities.
Newton's First Law of Motion is also known as the Law of _______.
Inertia
Gravity
Acceleration
Momentum
Newton's First Law is known as the Law of Inertia because it describes an object's tendency to resist changes in its state of motion. This principle explains why a moving object continues moving unless acted upon by an external force.
What is the SI unit of force?
Newton
Joule
Watt
Pascal
The SI unit for force is the newton (N). This unit is derived from the equation force = mass × acceleration.
Which instrument is used to measure electric current?
Ammeter
Voltmeter
Ohmmeter
Barometer
An ammeter is used to measure the flow of electric current in a circuit. Other instruments, like voltmeters and ohmmeters, measure voltage and resistance respectively.
An object starts from rest and accelerates uniformly to a speed of 20 m/s in 4 seconds. What is its acceleration?
5 m/s²
4 m/s²
10 m/s²
2 m/s²
Acceleration is calculated by dividing the change in velocity by the time taken. Here, (20 m/s - 0 m/s) / 4 s equals 5 m/s².
A 10 kg object is pushed with a force that produces an acceleration of 2 m/s². What is the magnitude of the force applied?
20 N
5 N
10 N
40 N
Using Newton's second law (F = m × a), the force is calculated as 10 kg × 2 m/s², which equals 20 N. This demonstrates the direct relationship between mass, acceleration, and force.
When a moving object comes to rest due to friction, its kinetic energy is primarily converted into which form of energy?
Thermal energy
Potential energy
Electrical energy
Sound energy
Friction converts the kinetic energy of a moving object into thermal energy, causing an increase in temperature. This is why brakes become hot when used extensively.
What is the principle of conservation of momentum?
Momentum is lost during collisions
Total momentum is conserved in an isolated system
Momentum is created from energy
Momentum always increases
In an isolated system with no external forces, the total momentum remains constant before and after an event such as a collision. This conservation principle is crucial in solving collision problems.
Which of the following best describes a series circuit?
It has only one path for current flow
It has multiple paths for current flow
It divides voltage equally among components
It minimizes resistance by parallel connections
A series circuit connects components end-to-end, creating a single path for the current to flow. This distinguishes it from parallel circuits, where the current can split between multiple paths.
In an elastic collision, which of the following statements is true?
Only momentum is conserved
Only kinetic energy is conserved
Both momentum and kinetic energy are conserved
Neither momentum nor kinetic energy is conserved
Elastic collisions are defined by the conservation of both momentum and kinetic energy. These conservation laws are used to solve for the final velocities of the colliding objects.
What happens to the gravitational force between two objects if the distance between them is doubled?
It becomes one fourth
It doubles
It remains the same
It halves
According to Newton's law of gravitation, the gravitational force is inversely proportional to the square of the distance between two objects. Doubling the distance reduces the force to one fourth its original value.
In a pendulum clock, what energy transformation occurs at the highest points of the swing?
Kinetic energy is converted to potential energy
Potential energy is converted to thermal energy
Electrical energy is converted to kinetic energy
Chemical energy is converted to light energy
At the highest points of its swing, a pendulum has maximum potential energy and minimal kinetic energy. This energy conversion between kinetic and potential forms is fundamental to its oscillatory motion.
Which law explains the importance of wearing seat belts in moving vehicles?
Newton's First Law
Newton's Second Law
Newton's Third Law
Hooke's Law
Newton's First Law, or the law of inertia, states that an object in motion tends to remain in motion. Seat belts are crucial because they help restrain passengers during sudden stops, counteracting inertia.
What is the gravitational potential energy of an object with a mass of 2 kg raised to a height of 5 m? (Use g = 9.8 m/s²)
98 Joules
49 Joules
19.6 Joules
9.8 Joules
Gravitational potential energy is calculated using the formula PE = m × g × h. For a mass of 2 kg at a height of 5 m, the energy is 2 × 9.8 × 5 = 98 Joules.
A 5 kg object is dropped from a height of 10 m. Ignoring air resistance, what is its speed just before impact? (Use g = 9.8 m/s²)
14 m/s
20 m/s
9.8 m/s
28 m/s
By applying the energy conservation principle, the potential energy at 10 m is converted into kinetic energy just before impact. Using v = √(2gh), we find the speed to be approximately 14 m/s.
Two objects of masses 3 kg and 7 kg collide elastically. If the 3 kg object initially moves at 10 m/s while the 7 kg object is stationary, which conservation laws are essential to determine their final velocities?
Conservation of momentum only
Conservation of kinetic energy only
Both conservation of momentum and conservation of kinetic energy
Conservation of momentum and energy but not kinetic energy
In elastic collisions, both momentum and kinetic energy are conserved. These two principles are used together to solve for the final velocities of the colliding objects.
A projectile is launched at an angle of 30° above the horizontal with an initial speed of 20 m/s. What is the maximum height reached by the projectile? (Use g = 9.8 m/s²)
5.1 m
8.7 m
10.0 m
20.0 m
The maximum height is found using the formula (v*sinθ)²/(2g). With v = 20 m/s and sin30° = 0.5, the height is (10²)/(19.6) which is approximately 5.1 m.
A 2 kg object moving at 15 m/s compresses a spring by 0.2 m before coming to a stop. What is the spring constant k? (Assume no energy losses)
11250 N/m
2250 N/m
4500 N/m
5625 N/m
The object's kinetic energy (½ × 2 kg × 15² = 225 J) is converted into spring potential energy (½ × k × 0.2²). Solving 225 = 0.02k gives k = 11250 N/m.
A 100 W light bulb is connected to a 120 V supply. Using the power formula, what is the current flowing through the bulb?
0.83 A
1.2 A
0.5 A
0.1 A
The power formula (P = IV) can be rearranged to I = P/V. Substituting the given values yields I = 100 W / 120 V, which is approximately 0.83 A.
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Study Outcomes

  1. Understand the fundamental principles of motion, force, and energy.
  2. Apply mathematical equations to solve numerical physics problems.
  3. Analyze real test scenarios to identify common problem-solving strategies.
  4. Evaluate the validity of solutions by comparing them with physical laws.
  5. Synthesize multiple physics concepts to tackle integrated, exam-style challenges.

Examen de Fisica Noveno Grado Cheat Sheet

  1. Distance vs Displacement - Distance tells you how far you've walked, while displacement is your shortcut map from start to finish complete with direction. Mastering this dynamic duo will help you decode motion questions like a pro! Physics Formulas for Class 9
  2. Newton's Laws of Motion - Inertia, acceleration, and action - reaction are the three amigos that govern how everything moves. From a hockey puck gliding on ice to rockets blasting off, these laws explain it all. Newton's Laws Cheat Sheet
  3. Work - Energy Theorem - When force teams up with distance, you get work, and that effort changes kinetic energy. Understanding W = ΔKE unlocks the secret behind speeding cars and soaring rockets. AP Physics 1 Key Formulas
  4. Conservation of Energy - Energy can't vanish or pop into existence; it only transforms - just like your morning coffee turning into the energy that powers your brain. Use this principle to solve whirlwinds of energy problems. Energy Conservation Guide
  5. Conservation of Momentum - In a closed system, momentum before and after a collision stays the same - perfect for predicting how bumper cars will bounce off each other. This rule is your collision-cracking superpower. AP Physics 1 Key Formulas
  6. Universal Law of Gravitation - Every mass pulls on every other mass, with a force that shrinks as distance grows. From falling apples to orbiting planets, this equation explains gravitational sneakiness. Gravitation Cheat Sheet
  7. Work and Energy Basics - Work is when force covers ground, and energy is the power to make it happen. Kinetic and potential energy formulas turn abstract ideas into number-crunching fun. Class 9 Physics Formulas
  8. Sound Waves - Sound is a party of compressions and rarefactions marching through air or solids, complete with frequency, wavelength, and speed. Knowing these properties helps you tune in to acoustics like a pro. Class 9 Physics Formulas
  9. Buoyancy & Archimedes' Principle - Float or sink? The fluid you dip into pushes back with a force equal to the weight it displaces. Ships, submarines, and ducks all owe their buoy edges to this nifty rule. Buoyancy Basics
  10. Basic SI Units - Meters, kilograms, seconds, amperes, and kelvins are your physics building blocks. Using the right units keeps your answers on point and your calculations crystal clear. SI Units Summary
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