Transcript Falling objects - DrBravophysics

• You can use distance–time graphs to calculate speed /
acceleration. The steeper the gradient, the slower /
faster the speed / acceleration.
• You can use velocity-time graphs to calculate speed /
acceleration. The steeper the gradient, the slower /
faster the speed / acceleration.
Q) A police car travels 6000 metres in 500 seconds.
Calculate the average speed with units.
Q) An object speeds up from 2 m/s to 6 m/s in 2
seconds. Find its acceleration with units.
Falling objects
L.O.:
 Use the equation weight = mass x gravitational
field strength.
Describe the forces acting on a falling object.
Explain what terminal velocity is.
In pairs, discuss ( 2 minutes):
• What is the difference mass and weight.
• Would your weight in the Moon be the
same? Why
clip
The weight of an object is the force of the
gravity on it.
The mass of an object is the quantity of matter
in it.
weight = mass x gravitational field strength.
motion of a parachutist
If an object falls in a fluid, the fluid drags on the
object. The drag force increases with speed.
If the fluid is air, the drag force is called air
resistance.
To do:
1) Workbook pages 63, 64
2) Worksheets.
Falling objects
L.O.:
 Use the equation weight = mass x gravitational
field strength.
Describe the forces acting on a falling object.
Explain what terminal velocity is.