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Quizzes > Science

Dynamics Test: Practice Forces, Motion, and Newton's Laws

Quick, free dynamics quiz to check your understanding. Instant results.

Editorial: Review CompletedCreated By: Chance TempleUpdated Aug 26, 2025
Difficulty: Moderate
Grade: Grade 11
Study OutcomesCheat Sheet
Paper art representing a dynamic physics quiz for high school students.

This dynamics quiz helps you check your understanding of forces, motion, and Newton's laws with 20 quick questions. See what you know, get instant feedback, and fill any gaps. For targeted practice, try net force questions and the acceleration quiz, or review the big picture with a forces and motion quiz.

What does Newton's First Law state?
Energy cannot be created or destroyed.
An object at rest stays at rest and an object in motion stays in motion unless acted on by an external force.
Force equals mass times acceleration.
For every action, there is an equal and opposite reaction.
Newton's First Law, also known as the law of inertia, states that an object will maintain its state of rest or uniform motion unless acted upon by an external force. This principle is fundamental in understanding the behavior of objects in dynamics.
What is the SI unit for force?
Pascal
Watt
Joule
Newton
The Newton is the SI unit of force, defined based on the relationship F = ma. The other options correspond to units for energy, power, and pressure respectively, which are not used to measure force.
In a frictionless environment, an object in motion will continue to move until:
A net force acts upon it.
It encounters gravity.
Its velocity reaches zero.
It runs out of kinetic energy.
According to Newton's First Law, if no net external force acts on an object, it will continue in its state of motion. In a frictionless environment, there is nothing to decelerate the object, so it keeps moving.
What is the formula for acceleration when given initial and final velocities and time?
a = (v - u) / t
a = t / (v - u)
a = (u + v) / t
a = u * v / t
Acceleration is defined as the change in velocity divided by the time over which the change occurs, which gives the formula a = (v - u) / t. This basic equation is a cornerstone in solving dynamics problems.
Which of the following best describes Newton's Second Law?
F = a/m
F = m/a
F = ma
F = mv
Newton's Second Law states that the net force acting on an object equals its mass multiplied by its acceleration (F = ma). This relationship forms the basis for calculating forces in dynamic situations.
If a car of mass 1000 kg accelerates at 2 m/s², what is the net force acting on the car?
1000 N
500 N
200 N
2000 N
Using Newton's Second Law (F = ma), the force can be calculated as 1000 kg multiplied by 2 m/s², which equals 2000 N. This problem demonstrates the straightforward application of the law.
A box is sliding across a surface with friction. Which factor primarily affects the kinetic frictional force?
The weight distribution
The normal force
The object's mass alone
The object's velocity
The kinetic frictional force is directly proportional to the normal force exerted on the object. While the object's mass influences the normal force, it is the normal force itself that determines the friction experienced.
Which quantity remains conserved in an isolated system regardless of internal dynamics?
Momentum
Force
Velocity
Acceleration
Momentum is conserved in an isolated system, according to the principle of conservation of momentum. This remains true even when internal forces act between the objects within the system.
When multiple forces act on an object, how is the net force determined?
By adding only magnitudes
By averaging the forces
By subtracting the smallest force from the largest
By vector addition of all forces
Forces are vectors, which means their direction is as important as their magnitude. The net force is found by performing a vector addition of all individual forces acting on the object.
A ball of mass 0.5 kg is thrown upward with a velocity of 10 m/s. Neglecting air resistance, what is the acceleration acting on the ball at its peak?
0 m/s²
10 m/s² downward
9.8 m/s² downward
9.8 m/s² upward
At the peak of its trajectory, the ball's upward velocity becomes zero, but the acceleration due to gravity remains acting downward at approximately 9.8 m/s². Air resistance is neglected here, so only gravity affects the acceleration.
Which of the following scenarios best demonstrates the concept of inertia?
A stone falling from a building
A car accelerating on a highway
An object that speeds up on a slope
A passenger lurching forward when a car suddenly stops
The passenger lurching forward when the car stops is a clear demonstration of inertia, where the passenger tends to continue moving forward even as the car decelerates. This example illustrates Newton's First Law in a real-life scenario.
What is the effect of doubling the mass of an object while keeping the applied force constant?
It quadruples the acceleration
It halves the acceleration
It doubles the acceleration
It has no effect on acceleration
According to Newton's Second Law (F = ma), if the force is constant, the acceleration will be inversely proportional to the mass. Doubling the mass results in half the acceleration.
A cyclist applies brakes and comes to a stop within 5 seconds. Which variable primarily determines the braking force?
Change in momentum over time
The initial speed only
Distance traveled during braking
The bike's weight
The braking force is linked to the rate at which momentum changes (impulse). A rapid change in momentum over a short time interval indicates a larger force, according to the impulse-momentum theorem.
In a collision between two objects of unequal masses where momentum is conserved, the lighter object will generally:
Come to a stop
Travel slower after collision
Have no motion
Travel faster after collision
In a collision that conserves momentum, the lighter object typically gains a higher velocity to balance the larger momentum carried by the heavier object. This outcome is a common result in dynamics involving collisions.
A constant force results in constant acceleration. Which of the following defines this relationship?
F = ma
a = F/m + constant
F = m + a
F = m/a
This relationship is a statement of Newton's Second Law, showing that force is directly proportional to both mass and acceleration. It forms the basis for analyzing dynamics where forces produce acceleration.
A 5 kg object is subjected to two forces: 15 N east and 10 N north. What is the magnitude of the resultant force?
Approximately 5.0 N
Approximately 25.0 N
Approximately 10.0 N
Approximately 18.0 N
The resultant force can be found using the Pythagorean theorem, combining the perpendicular components: √(15² + 10²) ≈ √(225 + 100) = √325 ≈ 18.0 N. This question applies vector addition to determine net force.
A projectile is launched from ground level at an angle of 45° with an initial speed of 20 m/s. Ignoring air resistance, what is the approximate time of flight?
Approximately 1.4 seconds
Approximately 4.2 seconds
Approximately 5.6 seconds
Approximately 2.9 seconds
For a projectile launched at 45°, the time to reach the maximum height is given by (v*sin45)/g, and the total time of flight is double that value. This calculation results in an approximate flight time of 2.9 seconds.
An object moves in a circular path with a constant speed of 4 m/s and a radius of 2 m. What is its centripetal acceleration?
4 m/s²
16 m/s²
2 m/s²
8 m/s²
Centripetal acceleration is calculated using the formula a = v²/r. Plugging in the given values (4 m/s and 2 m), we get 4²/2 = 16/2 = 8 m/s².
A train accelerates uniformly from rest reaching 30 m/s in 120 seconds. What is its acceleration?
1 m/s²
3 m/s²
2.5 m/s²
0.25 m/s²
Acceleration is the change in velocity divided by the time taken. Here, 30 m/s divided by 120 seconds results in an acceleration of 0.25 m/s².
A 10 kg object sliding on a rough surface comes to a stop due to friction. If the coefficient of kinetic friction is 0.3, what is the frictional force acting on the object?
Approximately 14.7 N
Approximately 29.4 N
Approximately 98 N
Approximately 3.3 N
The frictional force is determined by multiplying the coefficient of kinetic friction by the normal force. For a 10 kg object, the normal force is mg, which is 10 - 9.8 = 98 N, and 0.3 - 98 gives approximately 29.4 N.
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Study Outcomes

  1. Understand the fundamental principles of dynamics and motion.
  2. Apply Newton's laws to solve real-world motion problems.
  3. Analyze the forces acting on objects in motion.
  4. Synthesize problem-solving strategies for complex dynamic scenarios.
  5. Evaluate the effects of friction and resistance on moving systems.

Dynamics Quiz - Test Your Skills Cheat Sheet

  1. Newton's Second Law (F = ma) - Think of forces as pushy friends: the heavier the object or the faster you want it to move, the more force you need. This principle unlocks the secrets behind rockets, roller coasters, and your morning coffee mug sliding off the table.
  2. Kinematic Equations - Master equations like v = u + at and s = ut + ½at² so you can predict how far and how fast objects travel under constant acceleration. Whether you're analyzing a sprinter or a falling apple, these formulas are your best friends.
  3. Kinetic & Potential Energy - Dive into KE = ½mv² and PE = mgh to see how energy shifts between motion and position like a thrilling swap in an adventure story. Understanding these concepts helps you track energy transfers in everything from roller coasters to pendulums.
  4. Frictional Forces - Learn why static friction (Fₛ ≤ μₛFₙ) keeps you glued to the floor and kinetic friction (Fₖ = μₖFₙ) tries to slow you down once you start sliding. Friction is the sneaky force making everyday motions both possible and challenging.
  5. Work-Energy Theorem - Realize that the net work done on an object equals its change in kinetic energy (W = ΔKE), turning complex scenarios into simple energy bookkeeping. This theorem is your cheat code for connecting force and movement.
  6. Centripetal Force & Acceleration - Explore F = mv²/r and a = v²/r to understand how objects stay on circular paths, from carousels to planets. Knowing these lets you decode the secret forces keeping everything in orbit.
  7. Universal Gravitation - Grasp F = G(m₝m₂)/r² to see how every mass in the universe pulls on every other mass, from apples to asteroids. It's the ultimate cosmic handshake that binds galaxies.
  8. Impulse & Momentum - Impulse (FΔt) changes momentum (p = mv), so learn how force over time affects collisions and rebounds. This duo explains everything from car crashes to tennis ball volleys.
  9. Hooke's Law - Discover Fₛ = -kx, the rule that tells you how springs stretch or compress under force, from trampolines to mattress coils. It's the springboard for understanding elasticity.
  10. Conservation of Linear Momentum - In a closed system with no outside forces, total momentum stays constant, turning collision puzzles into solvable equations. It's like a cosmic billiards game with perfect bookkeeping.
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