equations of motion

What are the suvat equations?

• The SUVAT equations are the equations of motion used for objects in constant acceleration

What are the variables of the suvat equations?

• s  = displacement (m)

• u = initial velocity (m s^-1)

• v = final velocity (m s^-1)

• a = acceleration (m s^-2)

• t = time (s)

What are the 4 suvat equations?

V = U + at

s = ut + 0.5at²

s = (u+v)/2 (t)

v² = u² + 2as

What is a projectile?

a particle moving freely (non-powered), under gravity, in a two-dimensional plane

What does every object moving through the air experience and why?

• Any object moving through the air experiences air resistance which creates a force of drag

• This is caused by friction between the air molecules and the object

What is a fluid?

a term used to describe a liquid and a gas

What are the two main factors that affect the motion of an object?

The mass and surface area of an object

What are drag forces?

Forces that oppose the motion of an object moving through a fluid (gas or liquid)

What are the features of drag forces?

• Are always in the opposite direction to the motion of the object

• Never speed an object up or start them moving

• Slow down an object or keeps them moving at a constant speed

• Convert kinetic energy into heat and sound

What is lift?

Lift is an upwards force on an object moving through a fluid.It is perpendicular to the fluid flow

What happens to drag as speed increases?

drag increases

What is an examples of a drag force?

Air resistance

What happens to air resistance when speed increases?

• Air resistance increases with the speed of an object, such as a vehicle

What are the other factors taht affect maximum speed?

• Cross-sectional area

• Shape

• Altitude

• Temperature

• Humidity

What is terminal velocity?

This the maximum velocity that the object can have

What is true for a body in free fall?

the only force acting is its weight and its acceleration g is only due to gravity.

What increases as a body accelerates?

• The drag force increases as the body accelerates

  • This increase in velocity means the drag force also increases

Describe the forces acting on a skydiver

1 The skydiver is in freefall. Their velocity increases due to the downward force of their weight

2 The increases in velocity means air resistance. Also increases and acceleration decreases

3 Eventually, the sky diver reaches a velocity where their weight equals the force of air resistance.Their acceleration is 0. This is the terminal velocity