Motion

What is speed?

Speed is distance travelled per unit of time

What is the equation for average speed and speed with units?

Average speed or speed = distance/time (m/s)

What is the equation for velocity?

Velocity =displacement/time

Difference from speed and velocity?

Speed is a scalar quantity but velocity is a vector quantity, as it describes direction as well

What is velocity?

Speed in a given direction

What is the acceleration of a free fall g for an object near the surface of the earth?

9.8 m/s²

What is acceleration?

Change in velocity per unit time

What is the formula for acceleration?

Acceleration = Change in velocity/change in time

What is deceleration?

A negative acceleration

Equation for force

Force = Mass x acceleration (N)

What is the motion of objects falling in a uniform gravitational field without air resistance?

In the absence of air resistance, all objects would fall with the same acceleration, 9.8 m/s²

Relationship between speed and time with no air resistance?

They are directly proportional

What is the motion of a skydiver falling through a uniform gravitational field with air resistance?

When the skydiver first jumps from the plane, they will accelerate due to their weight being larger than the force of air resistance. As the skydiver speeds up, the air resistance increases until the air resistance equals the force of weight, and the forces are in equilibrium. The skydiver’s acceleration is now 0, and moving at a constant speed which is called their terminal velocity