Linear Motion SAQ

Magnitude and direction

A scalar has only magnitude, while a vector has both magnitude and direction

The triangle and parallelogram law

<p>Trigonometry and Pythagoras theorem</p> Signup and view all the answers

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

<p>ms-1</p> Signup and view all the answers

<p>s = d t</p> Signup and view all the answers

<p>It has no direction</p> Signup and view all the answers

<p>Displacement is the distance in a given direction, whereas distance is the total length of the path travelled.</p> Signup and view all the answers

<p>Velocity is the rate of change of displacement with respect to time. v = s/t</p> Signup and view all the answers

<p>The unit of velocity is ms^-1.</p> Signup and view all the answers

<p>Velocity is a vector quantity that includes both magnitude and direction, whereas speed is a scalar quantity that only includes magnitude.</p> Signup and view all the answers

<p>In the absence of air resistance and near the earth's surface.</p> Signup and view all the answers

<p>A body can have acceleration even if its speed remains constant, as long as it is changing direction.</p> Signup and view all the answers

<p>It is the acceleration due to gravity that all objects near the earth's surface would fall with in the absence of air resistance.</p> Signup and view all the answers

<p>Acceleration is the rate of change of velocity with respect to time.</p> Signup and view all the answers

<p>a = v-u / t</p> Signup and view all the answers

<p>The acceleration of an object is the rate of change of its velocity, and the equation v = u + at shows that the final velocity of an object is equal to its initial velocity plus the product of its acceleration and time.</p> Signup and view all the answers

<p>s = ut + 1/2 at^2 The equation s = ut + 1/2 at^2 describes the relationship between an object's displacement and its acceleration by showing that the displacement of an object is equal to the product of its initial velocity and time, plus half the product of its acceleration and the square of the time.</p> Signup and view all the answers

<p>v^2 = u^2 + 2as The equation v^2 = u^2 + 2as shows that the square of an object's final velocity is equal to the square of its initial velocity, plus twice the product of its acceleration and displacement, and is a fundamental concept in the calculation of an object's kinetic energy.</p> Signup and view all the answers

<p>Acceleration is the rate of change of velocity, and is a measure of how quickly an object's velocity is changing, whereas velocity is a measure of an object's speed in a specific direction.</p> Signup and view all the answers

<p>The variables u and v represent the initial and final velocities of an object, respectively, and are used to describe the motion of an object under constant acceleration.</p> Signup and view all the answers

<p>Mass, and its unit is kilogram (kg)</p> Signup and view all the answers

<p>Momentum, and its unit is kilogram meter per second (kg.m/s^-1)</p> Signup and view all the answers

<p>The principle of conservation of momentum states that the total momentum before an interaction is equal to the total momentum after, within a closed system. This principle is significant because it implies that the total momentum of a closed system remains constant, regardless of the interactions within the system.</p> Signup and view all the answers

<p>m1u1 + m2u2 = m1v1 + m2v2, where m1 and m2 are the masses of the two objects, and u1, u2, v1, and v2 are their initial and final velocities, respectively.</p> Signup and view all the answers

<p>The condition required is that the system must be closed, meaning that no external forces or torques act on the system. This principle is important because it allows us to analyze and predict the outcomes of collisions and other interactions.</p> Signup and view all the answers

<p>The unit of force is Newton (N), and one Newton is the force that gives a mass of 1 kilogram an acceleration of 1 ms^-2.</p> Signup and view all the answers

<p>The resultant of any two of them is equal in magnitude but opposite in direction to the third force.</p> Signup and view all the answers

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

<p>Three forces acting on the particle must be balanced, such that the resultant of any two of them is equal in magnitude but opposite in direction to the third force.</p> Signup and view all the answers

<p>A force is something that causes acceleration, and it affects the motion of an object by changing its velocity or causing it to change direction.</p> Signup and view all the answers

<p>The unit of force is the Newton (N), which is defined as the force that gives a mass of 1 kilogram an acceleration of 1 m/s².</p> Signup and view all the answers

<p>The resultant of any two of the forces is equal in magnitude but opposite in direction to the third force.</p> Signup and view all the answers

<p>Force (F) is equal to the product of mass (m) and acceleration (a), or F = ma.</p> Signup and view all the answers

<p>The net force on an object at rest is zero, implying that the sum of all the forces acting on the object is equal to zero.</p> Signup and view all the answers

<p>A force is something that causes an object to accelerate, and the acceleration of an object is directly proportional to the force applied and inversely proportional to its mass.</p> Signup and view all the answers

<p>A body remains at rest or continues moving at constant velocity unless acted upon by a resultant external force.</p> Signup and view all the answers

<p>The rate of change of momentum is proportional to the applied force and takes place in the direction of the force.</p> Signup and view all the answers

<p>For every action, there is an equal and opposite reaction.</p> Signup and view all the answers

<p>The force (F) is proportional to the rate of change of momentum (dp/dt).</p> Signup and view all the answers

<p>When the net force acting on an object is zero.</p> Signup and view all the answers