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Quizzes > Quizzes for Business > Education

Physics Quiz on Force and Motion

Master the Laws of Forces and Motion

Difficulty: Moderate
Questions: 20
Learning OutcomesStudy Material
Colorful paper art depicting elements related to Physics Quiz on Force and Motion.

Ready to challenge your physics skills? This force and motion quiz dives into Newton's laws and real-world dynamics, making it perfect for students or educators seeking a quick physics practice quiz. Participants will apply concepts, analyse forces, and refine their problem-solving techniques - all in an interactive, editable format. Feel free to adjust questions and answers directly in the quiz editor. After completing this assessment, explore related Force Classification Quiz and Physics Mechanics Practice Quiz, or browse more quizzes.

Which statement best describes Newton's first law of motion?
An object requires a constant force to maintain its motion.
The net force on an object is directly proportional to its acceleration.
An object remains at rest or in uniform motion unless acted upon by a net external force.
Every action has an equal and opposite reaction.
Newton's first law, also called the law of inertia, states that an object will remain at rest or move at constant velocity unless a net external force acts on it. It highlights that no force is needed to maintain motion in the absence of opposing forces.
What is the mathematical form of Newton's second law of motion?
F = ma
E = mc^2
m = Fa
a = mF
Newton's second law states that the net force acting on an object equals its mass multiplied by its acceleration (F = ma). This relationship quantifies how force and mass determine acceleration.
Which of the following illustrates Newton's third law of motion?
An object in motion stays in motion unless a force acts on it.
Force equals mass times acceleration.
The net force on an object is zero if acceleration is zero.
When you push on a wall, the wall pushes back on you with equal force.
Newton's third law states that for every action there is an equal and opposite reaction. When you push on a wall, the wall exerts an equal force back on you in the opposite direction.
Which quantity is a scalar rather than a vector?
Force
Acceleration
Mass
Velocity
A scalar has magnitude only, while vectors have both magnitude and direction. Mass is a scalar quantity because it has magnitude but no direction.
A 6 kg object is pushed with 12 N to the right and 4 N to the left. What is the net force on the object?
4 N to the left
12 N to the right
8 N to the right
16 N to the right
The net force is the vector sum of forces: 12 N right minus 4 N left equals 8 N to the right. This net force determines the object's acceleration direction.
A 2 kg object experiences a net force of 10 N. What is its acceleration?
0.2 m/s²
20 m/s²
2 m/s²
5 m/s²
Newton's second law (F = ma) gives a = F/m = 10 N / 2 kg = 5 m/s². This directly relates force, mass, and acceleration.
Which forces act on a block at rest on a frictionless horizontal surface?
Weight downward and friction
Weight downward, normal upward, and friction
Only weight downward
Weight downward and normal upward
On a frictionless horizontal surface, the block experiences its weight downward and an equal normal force upward. No friction acts because the surface is frictionless.
Which statement correctly compares static and kinetic friction?
Static friction is always less than kinetic friction.
Maximum static friction is generally greater than kinetic friction.
Kinetic friction prevents motion indefinitely.
Static friction only acts when an object is moving.
Static friction, which must be overcome to start motion, typically has a higher maximum value than kinetic friction, which acts once an object is sliding.
If the same net force acts on two objects but one object has double the mass of the other, how do their accelerations compare?
The heavier object has zero acceleration.
The heavier object's acceleration is half that of the lighter object.
Both have the same acceleration.
The heavier object's acceleration is double that of the lighter object.
From F = ma, if mass doubles but force stays constant, acceleration must halve. This shows the inverse relationship between mass and acceleration.
A 10 kg block rests on a horizontal surface. The coefficient of kinetic friction is 0.2. What is the frictional force?
2.0 N
19.6 N
49.0 N
9.8 N
Normal force equals mg = 10 kg·9.8 m/s² = 98 N. Kinetic friction is μkN = 0.2·98 N = 19.6 N opposing motion.
Two perpendicular forces of 3 N and 4 N act on a particle. What is the magnitude of the resultant?
5 N
1 N
12 N
7 N
When forces are perpendicular, the resultant magnitude is found by the Pythagorean theorem: √(3²+4²) = 5 N.
A block on an incline makes an angle θ with the horizontal. What is the component of its weight acting parallel to the incline?
mg·sinθ
mg/ cosθ
mg/ sinθ
mg·cosθ
The component of gravitational force parallel to the plane is mg·sinθ, which drives motion along the incline when friction is absent.
An object moves at a constant nonzero velocity. What can be said about the net force acting on it?
The net force is positive.
The net force is equal to its mass.
The net force is zero.
The net force is equal to its weight.
Constant velocity implies zero acceleration, so by Newton's second law the net force must be zero. Balanced forces do not change the state of motion.
A skydiver in free fall below terminal velocity is accelerating. Which forces act on the skydiver?
Only weight downward
Weight downward and normal force upward
Only friction upward
Weight downward and air resistance upward
Before terminal velocity, gravity (weight) pulls downward and air resistance opposes motion upward. The difference causes net acceleration downward.
A block of mass m rests on a frictionless incline of angle θ. What is the normal force exerted on the block?
m·g·tanθ
mg·sinθ
mg
mg·cosθ
On an incline, the normal force equals the component of weight perpendicular to the surface, which is mg·cosθ when there is no friction.
A 5 kg block slides down a 30° incline with a kinetic friction coefficient of 0.2. What is its acceleration? (g=9.8 m/s²)
4.90 m/s²
2.45 m/s²
1.60 m/s²
3.20 m/s²
Downhill component: mg·sin30°=24.5 N. Friction: μk·mg·cos30°≈8.49 N. Net force≈16.01 N, so a=F/m≈16.01/5=3.20 m/s².
Two masses of 3 kg and 5 kg are connected by a light rope over a frictionless pulley. What is the magnitude of their acceleration? (g=9.8 m/s²)
9.80 m/s²
2.45 m/s²
4.90 m/s²
1.96 m/s²
Acceleration in an Atwood machine: a=(m₂ - m₝)/(m₝+m₂)·g = (5 - 3)/8·9.8 ≈2.45 m/s², directed downward for the heavier mass.
A 4 kg block on a rough horizontal floor (μk=0.1) is pulled by a 20 N force at 40° above horizontal. What is its acceleration? (g=9.8 m/s²)
3.17 m/s²
2.45 m/s²
1.60 m/s²
4.90 m/s²
Horizontal component: 20·cos40°≈15.32 N. Vertical component reduces normal: N=mg - 20·sin40°≈39.2 - 12.86=26.34 N. Friction=0.1·26.34≈2.63 N. Net force=15.32 - 2.63≈12.69 N, so a≈12.69/4=3.17 m/s².
Three concurrent forces act on a particle: 8 N east, 6 N north, and 2 N west. What is the magnitude of the resultant force?
10.00 N
6.00 N
2.00 N
8.49 N
Net east - west: 8 - 2=6 N east; north: 6 N. Resultant magnitude = √(6²+6²) ≈8.49 N directed northeast.
A 2 kg block on a horizontal surface (μk=0.1) is attached to a 3 kg hanging mass by a rope over a frictionless pulley. What is the acceleration of the system? (g=9.8 m/s²)
1.47 m/s²
2.94 m/s²
5.49 m/s²
3.27 m/s²
Friction on block: μk·m₝g=0.1·2·9.8=1.96 N. Net driving force: m₂g - friction=29.4 - 1.96=27.44 N. Total mass=5 kg, so a=27.44/5≈5.49 m/s².
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Learning Outcomes

  1. Identify core principles of Newton's laws of motion
  2. Demonstrate calculation of net force and acceleration
  3. Apply free-body diagrams to real-world scenarios
  4. Analyse relationships between mass, force, and acceleration
  5. Evaluate the impact of friction on object movement
  6. Master vector and scalar distinctions in motion analysis

Cheat Sheet

  1. Master Newton's Three Laws of Motion - Dive into Sir Isaac's brilliant rules that explain why your soccer ball sails across the field or why your chair stays put. These laws reveal the secret relationship between forces and motion and are the foundation for every physics adventure. Complete Newton's Second Law Toolkit
  2. Calculate Net Force and Acceleration - Grab your calculator and apply the formula Fₙₑₜ = m × a to predict how objects will speed up or slow down. Mastering this equation helps you tackle everything from roller coaster thrills to rocket launches. Newton's Second Law on LibreTexts
  3. Draw Accurate Free-Body Diagrams - Sketching forces like gravity, friction, and normal force turns complex problems into clear visuals. With every arrow you draw, you'll unlock the power of picturing and solving real-world force puzzles. Free-Body Diagram Guide
  4. Analyze Mass, Force, and Acceleration Relationships - Discover why heavier objects need more push while lighter ones zoom off faster. By playing with mass and force, you'll see firsthand how acceleration behaves under different conditions. Mass-Force-Acceleration Relations
  5. Understand Friction's Impact on Motion - Learn why sliding your books across a desk feels harder than pushing them on a smooth table. Friction is the sneaky force that always opposes motion and shapes everything from car brakes to ice skating. Friction and Free-Body Diagrams
  6. Differentiate Between Vectors and Scalars - Vectors are travel-savvy quantities with both magnitude and direction, while scalars just bring the numbers. Getting this right will supercharge your ability to solve velocity and speed challenges like a pro. Vectors vs Scalars
  7. Apply Newton's Laws to Real-World Scenarios - From launching paper airplanes to analyzing car crashes, Newton's laws are your toolkit for understanding motion around you. Turn everyday observations into physics case studies and amaze your friends with your insights! Real-World Newton's Laws
  8. Practice Problem-Solving with Force Diagrams - Level up by tackling problems that demand drawing and interpreting force diagrams step by step. Consistent practice will transform those intimidating scenarios into fun logic puzzles. Force Diagrams Practice
  9. Explore the Effects of Air Resistance - Find out why parachutes float and why your favorite paper plane eventually nosedives. Air resistance can dramatically alter speeds and trajectories, especially at high velocities. Air Resistance Effects
  10. Understand the Concept of Equilibrium - When all forces cancel out, objects either stay at rest or glide along at steady speed. Recognizing equilibrium scenarios is key to mastering statics and dynamic balance in physics problems. Equilibrium and Forces
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