Get ready to level up with our Grade 9 Physics Quiz: Free Online Physics Challenge! This free physics quiz is the perfect online physics quiz to test your mastery of force, energy and motion. Whether you're seeking a focused physics practice test or want to work through basic physics questions, this challenge pinpoints your strengths and spots areas for growth. Designed just for Grade 9 students, you'll build confidence, sharpen problem-solving skills, and enjoy a motivating learning experience. Hungry for more? Tackle a full physics test or try some targeted mechanics practice problems right now - dive in and discover what you can achieve!
What is the SI unit of force?
Pascal
Newton
Joule
Watt
Force in the SI system is measured in newtons, named after Isaac Newton. One newton is defined as the force required to accelerate a one-kilogram mass by one meter per second squared. This unit is fundamental in mechanics and is derived from Newton's second law. Learn more.
If a car travels at a constant speed of 20 m/s, what is its acceleration?
2 m/s²
0 m/s²
20 m/s²
9.8 m/s²
When an object moves at a constant speed in a straight line, its velocity does not change. Since acceleration measures the rate of change of velocity, a constant speed corresponds to zero acceleration. This follows directly from the definition of acceleration. Read more.
What is the speed of an object that covers 100 meters in 20 seconds?
20 m/s
0.2 m/s
2 m/s
5 m/s
Speed is calculated as distance divided by time: 100 meters ÷ 20 seconds = 5 meters per second. This is the average speed over the interval. Speed must be expressed in units of distance over time. More details.
What does it mean when forces on an object are balanced?
The object moves forward
The net force is zero
The object accelerates
The object is at rest
Balanced forces mean that all individual forces acting on an object sum to zero, resulting in no net force. When net force is zero, the object's velocity remains constant; it may be at rest or moving at uniform speed. This concept is part of Newton's first law. See Newton's First Law.
Which type of friction acts on an object at rest, preventing motion?
Rolling friction
Kinetic friction
Fluid friction
Static friction
Static friction is the force that resists the start of motion between two surfaces in contact. It must be overcome for an object to begin moving. Kinetic friction takes over once the object is in motion. Learn about friction.
Which of Newton's laws states that force equals mass times acceleration?
Third Law
Second Law
Law of Universal Gravitation
First Law
Newton's second law expresses the relationship F = ma, where F is net force, m is mass, and a is acceleration. It quantifies how an object's motion changes under applied forces. This law underpins much of classical mechanics. Details here.
What is the approximate value of gravitational acceleration on Earth?
9.8 m/s²
0.98 m/s²
9.8 N/kg
9.8 kg
The standard gravitational acceleration at Earth's surface is approximately 9.8 meters per second squared (m/s²). This describes how quickly objects accelerate when in free fall near the surface, ignoring air resistance. It's a fundamental constant in physics problems. More info.
What type of energy is associated with the motion of an object?
Thermal energy
Potential energy
Kinetic energy
Chemical energy
Kinetic energy is the energy an object has due to its motion and is given by ½mv². Any moving object possesses kinetic energy relative to a chosen frame of reference. Potential energy, by contrast, depends on position. Read more.
A 10 kg object is pushed with a force of 20 N. What is its acceleration?
2 m/s²
10 m/s²
200 m/s²
0.5 m/s²
Using Newton's second law, acceleration = force ÷ mass = 20 N ÷ 10 kg = 2 m/s². This directly applies F = ma. Ensure units are consistent for correct calculation. Reference.
How much work is done when a force of 50 N moves an object 4 meters in the direction of the force?
12.5 J
54 J
50 J
200 J
Work equals force multiplied by displacement in the direction of the force: W = F × d = 50 N × 4 m = 200 J. This definition assumes the force is constant and collinear with motion. More on work.
What is the kinetic energy of a 2 kg mass moving at 3 m/s?
1 J
6 J
9 J
18 J
Kinetic energy is ½mv²: 0.5 × 2 kg × (3 m/s)² = 9 J. This formula shows energy grows with the square of speed. Ensure proper substitution for m and v. Details.
A spring with a spring constant of 200 N/m is compressed by 0.1 m. What is its elastic potential energy?
2 J
1 J
0.5 J
10 J
Elastic potential energy in a spring is ½kx²: 0.5 × 200 N/m × (0.1 m)² = 1 J. The energy depends on the square of displacement. Learn more.
What is the momentum of a 0.5 kg ball traveling at 10 m/s?
10 kg·m/s
0.05 kg·m/s
15 kg·m/s
5 kg·m/s
Momentum p = m × v = 0.5 kg × 10 m/s = 5 kg·m/s. Momentum is a vector quantity but magnitude is calculated this way. See more.
How much power is needed to do 100 J of work in 5 seconds?
0.05 W
5 W
500 W
20 W
Power is work divided by time: P = W/t = 100 J ÷ 5 s = 20 W. It measures the rate of energy transfer. More info.
What does the term "light-year" measure?
Luminosity
Distance
Time
Mass
A light-year is the distance that light travels in one Julian year, about 9.46 trillion kilometers. It is commonly used in astronomy to express interstellar and intergalactic distances. Read more.
A ball is thrown straight up with an initial velocity of 10 m/s. What is its velocity at the highest point?
9.8 m/s
10 m/s
0 m/s
-10 m/s
At the highest point of its trajectory, the ball's upward velocity is reduced to zero by gravity. After that instant it will begin to fall back down, gaining negative velocity. More on projectile motion.
What is the component of the gravitational force acting parallel to an incline of angle ? on a mass m?
mg cos?
mg sin²?
mg tan?
mg sin?
On an inclined plane, the parallel component of weight is m g sin?, where ? is the incline angle. This comes from resolving the weight vector into components. Learn more.
Two carts, 2 kg and 3 kg, move towards each other at 4 m/s and 2 m/s respectively and collide elastically. What is the total momentum before collision (taking one direction as positive)?
10 kg·m/s
6 kg·m/s
14 kg·m/s
2 kg·m/s
Taking the 2 kg cart's direction as positive: total momentum = (2 kg×4 m/s) + (3 kg×( - 2 m/s)) = 8 - 6 = 2 kg·m/s. Momentum is conserved in elastic collisions. Details.
What force provides the centripetal acceleration for an object of mass m traveling in a circle of radius r at speed v?
m v²/r
m r/v²
v²/r
m v/r²
The centripetal force required for circular motion is F = m v²/r, directed toward the center. It keeps the object moving along the curved path without changing its speed. Read more.
According to the work-energy theorem, the net work done on an object is equal to what change?
Change in momentum
Change in kinetic energy
Total mechanical energy
Change in potential energy
The work-energy theorem states that the net work done by all forces acting on an object equals its change in kinetic energy. It links force and motion quantitatively. More info.
A 2 kg object is moving in a circle at a constant speed of 4 m/s with a radius of 0.5 m. What is the centripetal force acting on it?
64 N
32 N
8 N
16 N
Using F = m v²/r gives F = 2 kg × (4 m/s)² ÷ 0.5 m = 64 N. This force acts toward the center of the circular path. Learn more.
What is the change in gravitational potential energy when a 10 kg mass is lifted vertically by 5 meters near Earth's surface?
50 J
100 J
490 J
250 J
Gravitational potential energy change is m g h = 10 kg × 9.8 m/s² × 5 m = 490 J. This assumes g ? 9.8 m/s² constant. More details.
A 1000 kg car slows down from 20 m/s to rest in 5 seconds. What is the magnitude of the average braking force?
2000 N
4000 N
100 N
20000 N
First find deceleration: a = ?v/?t = (0 - 20 m/s)/5 s = - 4 m/s². Then force = m a = 1000 kg × ( - 4 m/s²) = - 4000 N; magnitude is 4000 N. See second law.
A machine consumes 100 J of energy and performs 30 J of useful work. What is its efficiency?
300%
70%
3%
30%
Efficiency = (useful output energy ÷ input energy) × 100% = (30 J ÷ 100 J) × 100% = 30%. It measures how well energy is converted. More on efficiency.
A 75 kg roller coaster car starts from rest at a height of 20 meters. Ignoring friction, what is its speed at the bottom of the drop?
9.9 m/s
39.6 m/s
19.8 m/s
14 m/s
Using energy conservation: m g h = ½ m v², so v = ?(2 g h) = ?(2×9.8×20) ?19.8 m/s. Mass cancels out, so speed depends only on height. Read more.
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Study Outcomes
Understand fundamental forces -
Define and differentiate between contact and non-contact forces by engaging with targeted quiz items.
Analyze motion scenarios -
Interpret displacement, velocity, and acceleration in real-world contexts to solve grade 9 level motion problems.
Apply energy concepts -
Use the principles of kinetic and potential energy to calculate energy changes and understand conservation in sample questions.
Solve basic physics questions -
Employ relevant formulas and problem-solving strategies to tackle forces, energy, and motion questions accurately.
Identify areas for improvement -
Pinpoint specific topics where your understanding is weak to guide targeted review and study.
Boost test-taking confidence -
Enhance your problem-solving speed and accuracy through practice and immediate feedback on quiz results.
Cheat Sheet
Newton's Laws of Motion -
Review Newton's three laws to predict motion: F=ma links force and acceleration, while every action has an equal and opposite reaction. Recall "Inertia Is Relentless" as a mnemonic for the first law's resistance to change in motion. Mastering these laws helps you tackle force-based questions in your physics quiz.
Speed, Velocity, and Acceleration -
Differentiate speed (distance/time) from velocity (displacement/time) and calculate acceleration as Δv/Δt. Try sample problems like a car speeding up from 0 to 20 m/s in 5 s to find a=4 m/s². Getting these basics down is crucial for success in any physics practice test.
Work, Energy, and Power -
Use W=F·d to compute work and P=W/t for power; remember that energy can't be created or destroyed. For instance, lifting a 2 kg book 1 m requires W=2 kg×9.8 m/s²×1 m≈19.6 J. Solid grasp of these formulas will boost your score on basic physics questions.
Conservation of Energy -
The principle Eₚ + KE = constant lets you switch between potential (mgh) and kinetic (½mv²) energy seamlessly. Practice by calculating how high a pendulum swings back up after dropping - an exercise often featured in free physics quiz sections. Understanding this conservation helps you shine in the grade 9 physics quiz.
Momentum and Impulse -
Momentum p=mv measures motion's "oomph," while impulse J=F·Δt changes it; J equals the change in momentum. A handy tip: visualize catching a fast ball by increasing Δt to reduce force on your hands. Mastery here ensures you'll ace collision problems on the online physics quiz.
