Physics Chapter on Motion and Forces
17 Questions
2 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Which of the following statements best describes Newton's first law of motion?

  • An object will accelerate unless it has mass.
  • An object in motion will always move faster.
  • An object at rest will remain at rest unless acted upon by an unbalanced force. (correct)
  • An object will not move without friction.

Momentum is calculated as the product of mass and acceleration.

False (B)

The _____ is the point where weight is evenly distributed in an object.

centre of gravity

Which factor primarily increases air resistance on an object?

<p>Shape and surface area (D)</p> Signup and view all the answers

Match the following principles with their definitions:

<p>Mass = Amount of matter in an object measured in kg Impulse = Change in momentum calculated as force × time Friction = Resists motion between two surfaces in contact Gravity = A downward force that affects weight</p> Signup and view all the answers

Displacement is defined as the total path an object has traveled.

<p>False (B)</p> Signup and view all the answers

What type of motion occurs when an object moves along a straight path?

<p>linear motion</p> Signup and view all the answers

What happens to an object in motion if no unbalanced force acts on it?

<p>It will remain in motion. (C)</p> Signup and view all the answers

Impulse is the product of mass and velocity.

<p>False (B)</p> Signup and view all the answers

What is the formula for calculating force?

<p>F = Ma</p> Signup and view all the answers

The _____ is improved by lowering the center of mass.

<p>stability</p> Signup and view all the answers

Match the type of lever to its description:

<p>First-Class = Effort, Fulcrum, Load Second-Class = Effort, Load, Fulcrum Third-Class = Fulcrum, Effort, Load Fourth-Class = Not commonly used in sports mechanics</p> Signup and view all the answers

Which of the following best describes displacement?

<p>The shortest path in a straight line (C)</p> Signup and view all the answers

Gravity acts as an upward force on objects.

<p>False (B)</p> Signup and view all the answers

How does increasing mass affect stability?

<p>It increases inertia, making the object more stable.</p> Signup and view all the answers

A sprinter pushes against the blocks exerting a _____ force, and the blocks provide an equal and opposite force.

<p>backwards</p> Signup and view all the answers

Which factor primarily influences linear motion?

<p>Friction (C)</p> Signup and view all the answers

Flashcards

Newton's 1st Law

An object in motion stays in motion, and an object at rest stays at rest, unless acted upon by an unbalanced force.

Newton's 2nd Law

Force equals mass times acceleration (F=ma).

Newton's 3rd Law

For every action, there is an equal and opposite reaction.

Velocity

Speed in a specific direction.

Signup and view all the flashcards

Displacement

The shortest straight-line distance between a starting and ending point.

Signup and view all the flashcards

Mass

The amount of matter in an object.

Signup and view all the flashcards

Force

A push or a pull.

Signup and view all the flashcards

Friction

A force that resists motion between two surfaces that are in contact.

Signup and view all the flashcards

Inertia

The tendency of an object to resist changes in motion. An object at rest wants to stay at rest, and an object in motion wants to stay in motion.

Signup and view all the flashcards

Momentum

A measure of an object's motion, calculated by multiplying its mass and velocity. It's like the 'oomph' of an object.

Signup and view all the flashcards

Impulse

The change in an object's momentum. Occurs when a force is applied over a period of time.

Signup and view all the flashcards

How does a sprinter use inertia?

A sprinter uses inertia to their advantage by pushing off the starting block, overcoming inertia, and gaining speed.

Signup and view all the flashcards

How does a golfer use forces?

A golfer applies force with the club to the golf ball, causing it to accelerate and fly off the tee. This force overcomes the ball's inertia.

Signup and view all the flashcards

What is the relationship between force, mass, and acceleration?

Force (F) is directly proportional to both mass (m) and acceleration (a). This means a larger force creates a greater acceleration, and a larger mass requires a larger force to reach the same acceleration.

Signup and view all the flashcards

Why lower your Centre of Gravity (COM) for stability?

Lowering your COM increases stability because it widens the base of support. This means it takes more force to topple you over.

Signup and view all the flashcards

What is the difference between speed and velocity?

Speed is the rate at which an object moves, while velocity is speed with a specific direction. So, velocity is speed in a particular direction.

Signup and view all the flashcards

How does a lever work?

A lever uses a rigid bar and a fulcrum to amplify force. The effort force applied is multiplied by the lever's length, creating a greater load force.

Signup and view all the flashcards

What are the types of levers and their examples in sports?

There are three types of levers: First-class (EFL - effort, fulcrum, load), Second-class (ELF - effort, load, fulcrum), and Third-class (FEL - fulcrum, effort, load). Examples in sports include elbow extension (first-class), ankle flexion (second-class), and swinging a tennis racket (third-class).

Signup and view all the flashcards

Study Notes

Newton's Laws (How do they improve performance?)

  • An object in motion stays in motion, or an object at rest stays at rest, unless acted upon by an unbalanced force. This applies to both still and moving objects.
  • Force is equal to mass times acceleration (F = ma).
  • Every action has an equal and opposite reaction.

Sporting Examples

  • Inertia (1st Law): A golf ball on a tee remains stationary until the club hits it, overcoming its inertia, and causing it to fly off the tee.
  • Force and Acceleration (2nd Law): Kicking a ball involves applying force from leg muscles; the ball's mass affects its acceleration.
  • Action/Reaction (3rd Law): A sprinter pushes against a block, and the block pushes back with equal force, propelling the sprinter forward.

Velocity and Displacement

  • Velocity is speed in a specific direction.
  • Displacement is the shortest distance between two points.

Mass, Momentum, and Impulse

  • Mass is the amount of matter in an object (measured in kg).
  • Momentum is the product of mass and velocity (it represents motion inertia).
  • Impulse is the change in momentum (calculated as force × time of application).

Force (How does it improve performance?)

  • Friction: Opposes motion between surfaces.
  • Air Resistance: Increases with speed and surface area.
  • Gravity: A downward force.
  • Weight: Force due to gravity.

Linear Motion

  • Linear motion occurs when an object moves along a straight line.

Mass, Stability, and Center of Gravity (COM)

  • Mass affects stability by influencing inertia.
  • Stability improves when the center of gravity (COM) is lowered and the base of support is widened.
  • COM is the point where weight is evenly distributed.

Levers and Projectile Motion

  • Levers have three classes: first-class (effort-fulcrum-load), second-class (effort-load-fulcrum), and third-class (fulcrum-effort-load).
  • Projectile motion follows a curved path.
  • The best angle for projectile motion is 45 degrees.

Biomechanics' Importance in Sport

  • Biomechanics improves athletic performance and reduces injury risks.
  • It helps athletes refine techniques, increase efficiency, and apply forces effectively.
  • Coaches use biomechanics to tailor training, understand movements, and ensure safety.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

Related Documents

Sport Science Revision PDF

Description

Explore Newton's Laws of Motion and how they influence performance in sports. Understand concepts like inertia, force and acceleration, and action-reaction using sporting examples. This quiz will test your knowledge on velocity, displacement, mass, momentum, and impulse.

More Like This

Use Quizgecko on...
Browser
Open
Browser
Browser