b1 physics

Motion?

An object’s change in direction

Uniform motion

An object moving at a constant rate in a straight line

What an example of uniform motion

A car cruising on automode with no distractions

Non-uniform motion?

The rate on an object’s movement varying overtime

Examples of non-uniform motion?

A car speeding up and slowing down

Instantaneous speed?

The speed in which something is moving at a particular time

(Like a car’s speed being recorded)

How to calculate speed?

V = d/t

v- speed, d- distance, t- time

Whats a distance-time graph

A d-t graph is a graph that calculates speed. You can calculate speed from a d-t graph by calculating the slope of a line (y2-y1/x2-x1)

Whats a speed-time graph

A s-t graph calculates the acceleration

what does it mean when the lines moving up on a s-t graph

Acceleration

What does it mean when a line is moving down on a s-t graph

Deceleration

What does it mean when the lines moving is straight in a s-t graph

Uniform motion

How do you calculate the distance on a s-t graph?

Measuring the area underneath the line

(A= lxw or A= bxh/2)

Whats a scalar quantity

A quantity by itself

Whats vector quantity?

A quantity with direction

(5km north, etc)

North?

positive

East?

Positive

South?

Negative

West?

Negative

Whats distance

-Scalar

-measures how far an object has travelled from its starting point

Whats displacement

Displacement but with direction

Speed?

Scalar

Velocity?

Vector

How to calculate velocity?

V= d/t

(Velocity = displacement/time)

Whats average velocity

Uniform motion involving a change in direction

Whats acceleration?

A change in velocity over a change in time

Non-uniform motion

how to calculate acceleration

a= v/t

(Acceleration= velocity/time)

Whats positive acceleration?

-object is moving faster, forwards (++)

-object is moving slower, backwards (—)

Whats negative acceleration

-speeding up, backwards (+-)

-slowing down, forwards (-+)

Whats newtons 1st law of motion

“An object stays in uniform motion until another force acts upon it”

What will unbalanced forces do?

Either slow or speed up an object

Where will the object move

Same direction as the force

What is force?

An influence which changes the state of rest or uniform motion of an object

(A push or pull)

Force formula?

F = mxa

(Force= mass x acceleration)

Whats work?

Energy transferred onto an object when force is applied

Whats the first condition of work?

There myst be force applied

Whats the second condition of work?

There myst be movement

Whats the third condition of work

Object must move in the same direction as the applied force

Work formula?

w= fxd

(Work = force x distance)

whats work input?

When force is applied ONTO an object

whats work output?

energy gained by an object because if the force applied onto it

What happens between work and energy?

They are interchangeable, energy is the abilty to do work

E=W