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Quizzes > High School Quizzes > Electives

Newton's Laws of Motion Practice Quiz

Practice Newton's laws with engaging worksheets and quizzes

Difficulty: Moderate
Grade: Grade 9
Study OutcomesCheat Sheet
Paper art representing a trivia quiz about Newtons laws for high school physics students.

Which of Newton's laws states that an object will remain at rest or move with constant velocity unless acted upon by a net external force?
Newton's First Law of Motion
Newton's Third Law of Motion
Newton's Second Law of Motion
Hooke's Law
Newton's First Law of Motion states that an object will continue in its state of rest or uniform motion unless acted upon by an unbalanced force. Thus, the correct answer is Newton's First Law of Motion.
Which formula represents Newton's Second Law of Motion?
F = m/a
F = m + a
F = ma
F = m - a
Newton's Second Law states that the net force acting on an object is equal to its mass multiplied by its acceleration. Therefore, F = ma is the correct formula.
According to Newton's Third Law, every action has an equal and opposite ______.
Force
Acceleration
Reaction
Momentum
Newton's Third Law states that for every action force there is an equal and opposite reaction force. Therefore, the blank is correctly filled by 'reaction.'
What does the net force acting on an object primarily determine?
The object's weight
The object's inertia
The object's acceleration
The object's mass
According to Newton's Second Law, the net force on an object is directly proportional to its acceleration. Thus, the net force primarily determines the object's acceleration.
When an object is moving at a constant velocity, what is the net force acting on it?
Zero
Equal to its mass
Equal to its weight
Equal to its acceleration
An object moving at a constant velocity experiences no acceleration, implying that the net force acting on it is zero. This is a direct application of Newton's First Law.
A force of 10 N acts on a 2-kg object on a frictionless surface. What is the acceleration of the object?
0.2 m/s²
2 m/s²
20 m/s²
5 m/s²
Using Newton's Second Law (F = ma), the acceleration is calculated by dividing the force by the mass: 10 N / 2 kg equals 5 m/s². Thus, 5 m/s² is the correct answer.
Two skaters push off each other on ice. According to Newton's Third Law, the forces they exert on each other are:
Different in magnitude because one may be stronger
Equal in magnitude and opposite in direction
Equal in magnitude but not necessarily opposite
Only the heavier skater experiences a force
Newton's Third Law states that for every action there is an equal and opposite reaction. Consequently, the forces the skaters exert are equal in magnitude and opposite in direction.
If multiple forces act on an object, how is the net force determined?
By averaging the magnitudes of the forces
By subtracting the smallest force from the largest
By multiplying all the forces
By vector adding all the forces
The net force is the vector sum of all individual forces acting on an object, taking into account both magnitude and direction. Thus, vector addition is the correct method.
A car is accelerating on a flat road. Which factor primarily determines its rate of acceleration?
The net force acting on the car
The car's weight
The engine's displacement
The frictional force only
According to Newton's Second Law, an object's acceleration is determined by the net force acting on it divided by its mass. Therefore, the net force is the primary factor.
Which scenario best illustrates Newton's First Law of Motion?
A book resting on a table remains at rest until moved
A ball thrown upward decelerates due to gravity
A car accelerates when the gas pedal is pressed
A rocket launches upward
Newton's First Law, or the law of inertia, is best demonstrated by an object remaining at rest until an external force acts on it. Therefore, the book on a table is the correct example.
A bicycle and a truck experience different accelerations when the same force is applied. What explains this difference?
Their speeds
Their color differences
Their mass differences
Their friction with the ground
Newton's Second Law indicates that acceleration is inversely proportional to mass. Hence, the difference in mass between the bicycle and the truck explains their differing accelerations.
Which of the following best describes the concept of inertia?
The energy stored in a moving object
The measure of an object's mass
The tendency of an object to resist changes in its state of motion
The force that causes an object to accelerate
Inertia is defined as the resistance of any physical object to a change in its state of motion. This property is encapsulated by the object's tendency to maintain its current state, making the first option correct.
How does friction affect the net force acting on an object in motion?
It opposes the direction of motion, reducing the net force
It has no impact on the net force
It always acts in the same direction as the object's motion
It increases the net force by adding to the driving force
Friction is a resistive force that opposes the motion of an object, thereby decreasing the net force available for acceleration. This is why the correct answer is that friction reduces the net force.
In a system where a person pushes a box, what is the reaction force as per Newton's Third Law?
The friction between the box and the floor
The applied force on the box
The gravitational force on the box
The force the box exerts on the person
Newton's Third Law states that every action has an equal and opposite reaction. Thus, when a person pushes a box, the box pushes back with an equal force on the person.
A force is applied to an object at an angle. Which component of the force contributes to its horizontal acceleration?
The horizontal component
Neither component contributes
The sum of the horizontal and vertical components
The vertical component
Only the horizontal component of an angled force affects horizontal acceleration. This component is calculated by multiplying the force by the cosine of the angle relative to the horizontal.
A 5-kg object is subjected to two forces: 15 N to the right and 5 N to the left. What are the net force and acceleration of the object?
10 N to the left; -2 m/s²
5 N to the right; 1 m/s²
10 N to the right; 2 m/s²
20 N to the right; 4 m/s²
The net force is determined by subtracting the opposing force (5 N) from the applied force (15 N), giving 10 N to the right. Dividing this net force by the mass (5 kg) results in an acceleration of 2 m/s².
A 12-kg crate is pulled across a horizontal surface using a rope that makes a 30° angle with the horizontal. If the tension in the rope is 50 N and friction is ignored, what is the horizontal component of the applied force?
Approximately 43 N
Approximately 50 N
Approximately 25 N
Approximately 86 N
The horizontal component of the force is calculated as 50 N × cos(30°). Since cos(30°) is approximately 0.866, the horizontal force is about 43 N.
Two objects of different masses are dropped in a vacuum. According to Newton's laws, what is true about their acceleration?
Both objects accelerate at the same rate
Their acceleration depends on their initial velocity
The lighter object accelerates faster
The heavier object accelerates faster
In a vacuum, where air resistance is absent, all objects fall with the same acceleration due to gravity regardless of their mass. This is a key principle derived from Newton's laws.
A rocket in deep space ejects exhaust gases in one direction to propel itself in the opposite direction. Which of Newton's laws explains this phenomenon?
Newton's Second Law of Motion
Newton's First Law of Motion
Newton's Third Law of Motion
The Law of Universal Gravitation
The rocket's propulsion is a result of ejecting mass, which generates an equal and opposite reaction force. This is a direct application of Newton's Third Law of Motion.
A 10-kg block slides down a frictionless incline angled at 30° with the horizontal. What is its acceleration?
Approximately 3.5 m/s²
Approximately 9.8 m/s²
Approximately 8.5 m/s²
Approximately 4.9 m/s²
On a frictionless incline, the acceleration of the block is given by g multiplied by the sine of the incline angle. With sin(30°) equal to 0.5 and g approximately 9.8 m/s², the acceleration is about 4.9 m/s².
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Study Outcomes

  1. Understand the concept of inertia and its role in motion.
  2. Apply Newton's second law to calculate net force and acceleration.
  3. Analyze force interactions using Newton's third law.
  4. Synthesize problem-solving strategies to predict object motion.

Newton's Laws Worksheet & Cheat Sheet

  1. Newton's First Law (Law of Inertia) - Picture yourself in a sudden bus stop: you keep flying forward because there's no force telling you to chill. This law explains why objects at rest stick around and why moving things keep on moving until something intervenes. Embrace the idea that motion (or lack of it) won't change on its own! Dive in!
    2. mathsisfun.com: Newton's Laws of Motion
  2. Newton's Second Law (F = ma) - Double the force on a skateboarder and they zoom off twice as fast; increase their mass and they accelerate more slowly. It's the ultimate push × mass = speed-up formula that governs every rocket launch and sprinter's start. Get ready to calculate like a pro! Crunch numbers here
    3. GeeksforGeeks: Newton's Laws of Motion
  3. Newton's Third Law (Action and Reaction) - Ever noticed how a balloon zooms around the room when you let go? That's because every push has a push-back of equal strength. This mutual force pair is why rockets thrust upward and swimmers propel through water! Explore more
    4. GeeksforGeeks: Newton's Laws of Motion
  4. Understanding Inertia - Inertia is like your object's stubbornness: the heavier it is, the bigger its "I'm not moving!" or "I'm not stopping!" attitude. This hidden resistance to change is why pulling a tablecloth from under dishes requires skill. Master inertia to predict motion quirks! Get the scoop
    5. GeeksforGeeks: Newton's Laws of Motion
  5. Calculating Force - Force equals mass times acceleration, so a 5 kg object speeding up at 3 m/s² needs 15 N of push. Use this formula to figure out everything from car engine power to push strength in sports. Math + motion = magic! Start calculating
    6. GeeksforGeeks: Newton's Laws of Motion
  6. Free-Body Diagrams - These are like the cartoons of physics: arrows showing every push and pull on your object. Sketch them to untangle complex forces and nail those tricky homework problems. Visual learners, rejoice! Draw away
    7. The Physics Classroom: Newton's Laws Review
  7. Frictional Forces - Friction is the sneaky brake that resists motion, turning kinetic energy into heat. It's why your phone slides a bit less on carpet than on ice. Understanding it is key to mastering everything from car tires to ice skating! Feel the friction
    8. mathsisfun.com: Newton's Laws of Motion
  8. Mass vs. Weight - Mass is your object's "stuff" count and never changes, while weight is the gravity-grab on that stuff and varies by planet. You'd weigh less on Mars but still carry the same mass - space travel trivia at its finest! Clarify here
    9. GeeksforGeeks: Newton's Laws of Motion
  9. Momentum and Impulse - Momentum (mass × velocity) is your object's motion momentum account, and impulse (force × time) is the deposit that changes it. That game of bumper cars? Pure momentum and impulse in action! Track the change
    10. GeeksforGeeks: Newton's Laws of Motion
  10. Applications of Newton's Laws - From seat belts saving lives to space shuttles soaring into orbit, Newton's insights crack the code on everyday wonders. Mastering these laws means unlocking a deeper understanding of the world - and beyond! See them in action
    11. GeeksforGeeks: Newton's Laws of Motion
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