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Quizzes > High School Quizzes > Electives

Laws of Motion Practice Quiz

Master key motion laws for exam success

Difficulty: Moderate
Grade: Grade 9
Study OutcomesCheat Sheet
Paper art depicting a trivia quiz about motion principles and kinematics for high school students.

What does Newton's First Law of Motion state?
An object in motion stays in motion, and an object at rest stays at rest unless acted upon by an external force.
For every action, there is an equal and opposite reaction.
Force equals mass times acceleration.
Objects moving at constant speed are changing direction.
Newton's First Law, also known as the Law of Inertia, indicates that objects maintain their state of motion unless acted upon by an unbalanced external force. This principle explains why objects continue moving or remain at rest.
Which of the following quantities is a vector?
Speed
Distance
Velocity
Mass
Velocity has both magnitude and direction, making it a vector. Speed and distance are scalars as they only have magnitude.
What is the SI unit of acceleration?
Meter per second
Second
Newton
Meter per second squared
Acceleration measures the rate of change of velocity and is expressed in meters per second squared (m/s²) in the SI system. This makes it distinct from units of speed or force.
Which statement best describes friction?
A force that opposes relative motion between two surfaces in contact
The energy lost during motion
A measure of an object's resistance to acceleration
A type of kinetic energy
Friction is the resistive force that opposes the relative motion of surfaces in contact. It plays a key role in reducing motion and converting kinetic energy into thermal energy.
Why is it important to wear a seatbelt in a moving vehicle?
It reduces tire friction
It helps the car turn more sharply
It increases the car's acceleration
It counteracts the body's inertia during sudden stops
Seatbelts protect passengers by restraining their motion during sudden deceleration. This is due to the body's inertia, which would otherwise cause it to continue moving, potentially leading to injury.
What is the definition of acceleration?
Change in velocity divided by the time interval
Change in speed multiplied by mass
Time divided by distance
Force divided by mass
Acceleration is defined as the change in velocity over the time interval during which the change occurs. It determines how quickly an object speeds up, slows down, or changes direction.
For an object starting from rest, which kinematic equation relates displacement, acceleration, and time?
s = u + at
s = at
s = ut
s = ½at²
With an initial velocity of zero, the displacement for constant acceleration is given by s = ½at². This equation is a fundamental part of kinematics for uniformly accelerated motion.
When two objects are in free fall with negligible air resistance, what can be said about their accelerations?
Their accelerations depend on their initial speeds.
The heavier object accelerates faster.
Both objects experience the same acceleration.
The lighter object accelerates faster.
In free fall, ignoring air resistance, all objects experience the same acceleration due to gravity (approximately 9.8 m/s²). This principle demonstrates the uniformity of gravitational acceleration.
If an object's velocity is increasing as it moves to the right, what can be inferred about its acceleration?
The acceleration fluctuates.
The acceleration is negative.
The acceleration is zero.
The acceleration is positive.
An increase in velocity in a given direction implies that the acceleration is in that same direction. Therefore, an object moving to the right with increasing speed has a positive acceleration.
Which scenario best illustrates Newton's Third Law of Motion?
A ball rolling on a flat surface.
A car accelerating due to engine power.
An object remaining at rest unless acted upon by a net force.
A swimmer pushing against the water to move forward.
Newton's Third Law states that for every action, there is an equal and opposite reaction. A swimmer propelling forward by pushing water is a classic example of this law in action.
What is the net force acting on an object moving at a constant velocity?
Zero
Equal to its acceleration
Equal to its mass
Dependent on air resistance
An object moving at constant velocity experiences no acceleration, which means the net force acting on it is zero according to Newton's First Law. All acting forces are balanced in such a scenario.
Which graph represents an object moving with constant acceleration?
A constant dot on a velocity vs. time graph.
A horizontal line on a displacement vs. time graph.
A curved line on an acceleration vs. time graph.
A straight line on a velocity vs. time graph with a constant slope.
A straight line on a velocity versus time graph with a constant slope indicates a constant acceleration. The slope of this line directly represents the acceleration value.
To calculate an object's final velocity using the equation v = u + at, which additional factor is needed besides initial velocity and acceleration?
Mass
Time
Distance
Force
The equation v = u + at requires the time interval over which the acceleration is applied. Without time, it is impossible to calculate the change in velocity.
If an object's mass increases while the applied force remains constant, what happens to its acceleration?
It doubles.
It decreases.
It increases.
It stays the same.
According to Newton's Second Law (F = ma), if the force is constant and the mass increases, the acceleration must decrease. This inverse relationship ensures the law remains valid.
Which physical quantity is conserved in an isolated system where no external forces act during a collision?
Acceleration
Kinetic energy
Momentum
Speed
Momentum is conserved in an isolated system regardless of the type of collision. This conservation law is fundamental in understanding collision phenomena in physics.
A car accelerates from rest to 20 m/s in 5 seconds. What is its acceleration?
10 m/s²
4 m/s²
5 m/s²
2 m/s²
Acceleration is calculated using the formula a = Î"v/Î"t. Here, 20 m/s divided by 5 s yields an acceleration of 4 m/s².
An object is thrown vertically upward with an initial velocity of 25 m/s. Ignoring air resistance, what will its vertical velocity be at the highest point?
9.8 m/s
-25 m/s
0 m/s
25 m/s
At the highest point of its trajectory, the upward velocity reduces to zero before the object begins to descend. This is due to the deceleration caused by gravity.
If an object's net force is doubled while its mass remains constant, how will its acceleration change?
It doubles.
It quadruples.
It halves.
It remains the same.
Using Newton's Second Law (F = ma), doubling the net force while keeping mass constant will double the acceleration. This demonstrates the direct proportionality between force and acceleration.
A projectile is launched horizontally from the top of a building. Which statement accurately describes its motion?
Both its horizontal and vertical velocities remain constant.
Its horizontal velocity increases and its vertical velocity remains constant.
Its horizontal velocity remains constant while its vertical velocity increases due to gravity.
Its horizontal velocity decreases due to gravity, while vertical velocity remains unchanged.
When a projectile is launched horizontally, there is no acceleration in the horizontal direction (ignoring air resistance), so its horizontal velocity stays constant. Simultaneously, gravity causes a constant vertical acceleration, increasing the downward velocity.
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Study Outcomes

  1. Analyze the fundamental principles of motion, including Newton's laws.
  2. Apply kinematic equations to solve problems involving displacement, velocity, and acceleration.
  3. Interpret the relationship between force, mass, and acceleration in various motion scenarios.
  4. Synthesize mathematical and conceptual reasoning to evaluate motion problems.
  5. Critically assess real-world applications of motion and kinematics principles.

Laws of Motion Cheat Sheet

  1. Understand Newton's First Law of Motion (Law of Inertia) - Picture a hockey puck on ice that won't budge until you nudge it, and a rolling ball that keeps going unless friction or bumps intervene. Newton's First Law tells us that objects cling to their motion status - rest or uniform movement - unless a force steps in. In short, stuff likes to keep doing what it's already doing! Newton's laws of motion
  2. Master Newton's Second Law (F = ma) - Force equals mass times acceleration, meaning bulkier objects need more oomph to change speeds. Try hauling a grocery cart: it's way easier empty than loaded! This law gives you the formula to calculate just how much push is required. Newton's laws of motion
  3. Grasp Newton's Third Law (Action and Reaction) - When you push off the dock, the boat pushes you back - every action has an equal and opposite reaction. Newton's Third Law explains these push - pull pairs that make rockets soar and fish swim. Understanding this helps you see the invisible tug‑of‑war in every interaction. Newton's laws of motion
  4. Learn the Four Kinematic Equations - These four formulas tie together displacement, velocity, acceleration, and time so you can predict where and how fast. Use Δx = v₀t + ½at² to find distance under constant acceleration, or v = v₀ + at for speed changes. Mastering them is like unlocking cheat codes for motion problems! Kinematic Equations
  5. Differentiate Between Scalars and Vectors - Scalars are quantity‑only heroes like speed, while vectors bring direction into the mix like 60 km/h north. Mixing them up is like confusing "how fast" with "where to." Spotting the difference is your ticket to nailing physics problems. Kinematics | Definition, Formula, Derivation, Problems
  6. Understand Free Fall and Acceleration Due to Gravity - In free fall, gravity is the sole player, accelerating objects at about 9.8 m/s² downward. That means your dropped ball picks up nearly 10 m/s extra speed every second it falls (so maybe better hold tight!). This constant g is your go‑to for vertical motion puzzles. Kinematic Equations and Problem‑Solving
  7. Analyze Motion Graphs - Position‑time graphs show how far you've gone, and their slope tells you your velocity, while velocity‑time graphs' slopes reveal acceleration. A straight line on a position‑time graph means cruising at constant speed, and a curve on a velocity‑time graph means changing speed. These visual tools are like roadmaps to understand movement. Kinematic Equations and Kinematic Graphs
  8. Practice Problem‑Solving with Kinematic Equations - Cracking tons of practice problems is the fastest route to mastery - think of each as a tiny motion adventure. Calculate how far a car travels accelerating from rest at 3 m/s² over 5 seconds, then swap values for new scenarios. This method builds confidence and pinpoints areas that need a quick review. Kinematic Equations and Problem‑Solving
  9. Understand the Concept of Inertia - Inertia is an object's resistance to changes in its motion - heavier items have more staying power, like a boulder vs. a pebble. That's why it's easier to kick a soccer ball than a bowling ball. Recognizing inertia helps you predict how objects behave when forces appear. Newton's laws of motion
  10. Memorize Common Units and Conversions - Meters (m) for distance, seconds (s) for time, and meters per second squared (m/s²) for acceleration are your basic toolkit. Practice converting between km/h and m/s or grams and kilograms until it becomes second nature. Mastering units turns tricky calculations into smooth sailing on exams! Kinematics | Definition, Formula, Derivation, Problems
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