Unit 1 Revision Checklist

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    Unit 1: Check List Mechanics Motion:

    Understand the difference between scalar quantities and vector quantities

    Understand how to add vectors using trigonometry and the parallelogram rule

    Understand that a vector quantity at an angle can be split into its horizontal and vertical components

    Understand and know the differences and definitions for

    Distance and displacement

    Speed and velocity - and differentiate between instantaneous and average velocities

    Force and acceleration

    Know how to draw distance/displacement time, velocity time or acceleration time graphs

    What is the difference between UNIFORM velocity and CONSTANT velocity

    Know the /displacement time, velocity time or acceleration time graphs for objects that are:


    Moving with constant velocity

    Accelerating uniformly

    Accelerating non uniformly

    Decelerating uniformly

    Know what the gradient and area under the graphs mean for the different types of graphs mentioned above

    Know and learn the four main equations of motion

    Understand that the four main equations of motion are only applicable when acceleration is constant

    Understand what is free fall and the condition for free fall

    Know what is a projectile and its trajectory

    Know the different types of projectile trajectories : vertical, horizontal and angular

    Know which equations to use to calculate the time taken, the vertical velocity and horizontal velocity and distance

    Explain angular projectiles follow a parabolic path

    Explain why an object projected horizontally and dropped vertically simultaneously will reach ground at the same instant

  • 2

    Unit 1: Check List Mechanics Forces:

    Understand the different types of forces, e.g., contact forces, non- contact forces, electromagnetic f0rces, etc.

    State and explain Newtons First Law of Motion

    Explain what is equilibrium and relate Newtons first law with bodies in equilibrium

    Understand the concept of inertia, mass and weight

    Understand how the centre of gravity of a body affects the stability of a body in equilibrium

    Understand how to draw vector diagrams of objects in equilibrium

    Understand how to draw free body force diagrams

    State and explain Newtons Second Law of Motion

    Know the effect of change in force acting on a fixed mass

    Know the effect of change in mass on the acceleration produced by a fixed force

    Understand that a resultant force is needed for an acceleration to occur and that they are proportional to each other

    Explain the concept of the unit of newton using the equation F = ma

    Remember that the acceleration is always in the direction of the resultant force

    Explain how Newtons Second Law includes the First Law

    Calculate the resultant force on multi-body systems

    Explain the concept of apparent weightlessness

    State and explain Newtons Third Law of Motion

    Understand that forces come in pairs

    Remember the conditions for two forces to be a Newtons Third Law pair force

    Understand how to recognize third law pair forces

    Understand the connection between Newtons third law and equilibrium

    Mechanics Mechanics in the Real World:

    Explain the motion of a bouncing ball with appropriate graphs

    Draw velocity time graph for a person falling under free fall and then opening the parachute

    Explain the change in weight of bodies inside a lift

    Understand what forces act on a vehicle to make it move and keep it moving

    Understand the physics behind the safety of vehicles e.g. use of crumple zones, thinking distance, braking distance, etc.

    Show how forces act on sports people, e.g. bungee jumpers, rock climber, parachutist in free fall

  • 3

    Unit 1: Check List Mechanics Work, energy and power:

    Understand the difference between work and energy with respect to their definitions

    Understand the relationship between work and energy

    Explain the definition of a joule

    Define potential energy (gravitational and elastic) and kinetic energy

    Derive the formula for kinetic energy

    Understand that all forms of energy can be described in terms of potential energy and kinetic energy

    Understand that gravitational potential energy is directly converted to kinetic energy during free fall

    Understand the concept of internal energy

    Understand and explain the principle of conservation of energy

    Learn how to draw Sankey diagrams

    Calculate efficiency

    Define what is power

    Link power with motion and derive the corresponding formula

    Materials Fluids:

    Define density and pressure

    Derive the equation of pressure of a fluid in terms of height and density

    Explain how upthrust equals the weight of the fluid displaced

    Explain how objects float

    Explain why a ship floats while a brick sinks

    Define stream lines

    Define laminar flow and turbulent flow

    Learn the real world applications of laminar flow and turbulent flow e.g. designs of aeroplanes, sports cars, etc.

    Define viscosity

    Understand that viscosity of a fluid depends on the temperature of the fluid

    Learn the unit for the coefficient for viscosity

    Understand that viscous drag acts on an object moving through fluids

    Learn that the viscous drag force is given by Stokes law

    Remember the conditions for Stokes law to be valid

    Understand that an object achieves terminal velocity when the resultant force on the object is zero

    Draw the free body force diagram for a sphere falling down or moving up in a fluid and write down relevant equations

  • 4

    Unit 1: Check List Materials Solid Materials:

    Define the types of materials: rigid, elastic and plastic

    Define elastic and plastic deformation

    Define the different properties of materials: hardness, toughness, stiffness, brittle, malleable, ductile, etc.

    Define elastic and plastic behaviour of a solid

    Define Hookes law

    Explain the different parts of the graph of a spring being stretched beyond its elastic limit

    Define elastic limit, limit of proportionality, yield point, breaking point and hysteresis

    Understand the force-extension graph for natural rubber

    Learn the different force-extension graphs for different types of metal wires

    Define elastic strain energy and how to calculate it form a force-extension graph

    Define stress, strain and Young modulus

    Define tensile and compressive stress and strain

    Understand the difference between stiffness and Young modulus

    Understand the concept of necking

    Explain a given stress-strain graph

    Understand that the gradient and area of a stress-strain graph gives the Young modulus and energy density respectively

    Define yield stress, UTS and breaking point

    Learn the different stress-strain graphs for rubber, glass, copper wire, wood, iron, etc


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