Science Revision - Physics

What is a scalar quanity

Something that has a size but no direction. For example: distance, speed, time, and temperature.

What is a vector quantity

Something that has both a size and direction. For example: Displacement, velocity, acceleration, force, and weight.

What is the difference between displacement and distance?

Distance is the length of the path taken whereas displacement is the distance between where the object started and where it ended.

Formula triangle for d,v, and t.

d

v t

Formula for: average velocity

avg velocity = initial velocity + final velocity/2

Formula for: initial velocity

initial velocity = final velocity - (acceleration x time)

Formula for: final velocity

final velocity = initial velocity + (acceleration x time)

Formula for: acceleration

acceleration = final velocity - initial velocity / time

info about distance time graphs

Time is always placed on the horizontal axis, shows how far an object travels as time progresses, steep slope = object moving faster, and flat line = motion has stopped.

How do you turn km/h to m/s?

Divide by 3.6

How do I calculate the distance on a velocity time graph?

By finding the area of the shape created.

Triangle = b x h / 2

Rectangle/ square = w x h

Formula for: force

f = m x a

How do you find the gradient of a graph?

gradient = rise/run

How can I find the displacement of an object?

What is Newton’s Second Law

When an unbalanced force is applied to an object, it causes it to accelerate.