GPE / KE• Learning Objective: To know what

centripedal force is, and link to GPE + KE

C – Describe where force and velocity act in centripedal motion

B – Work out where a rollercoaster has centripedal force

A* - Work out GPE, KE and centripedal motion

1-2-3

GRAVITATIONAL POTENTIALENERGY

1. GPE = mass x acceleration of gravity x height. If mass is 10, height = 5 and gravity is 10, what is the GPE?

2. At the bottom of a fall, whattype of energy does GPE turn into?

3. How can you work out acceleration?

• Centripetal force..•

THIS IS THE DIRECTION OF THE VELOCITY

THIS IS THE DIRECTION OF THE FORCE

The ball is kept in its path by the tension in the string – an example of a CENTRIPETAL FORCE.

• Centripetal force..•

THIS IS THE DIRECTION OF THE VELOCITY

THIS IS THE DIRECTION OF THE FORCE

The bunsen is kept in its path by the tension in the tubing – an example of a CENTRIPETAL FORCE.

Orbits Electrons

Orbits

• For these examples, draw and label how the velocity and centripetal force changes

• Why is this a vector not a scalar?• What force is the centripetal force in

each?• Give 2 other examples of centripetal

forces• Explain centripetal force in your own

words• Assuming the velocity doesn’t increase, is

there an acceleration or not?• What direction does momentum act?• What direction does acceleration act?

Electrons

Orbits

• If this is the answer, what is the question?

• Acts inwards

• It has direction

• In different directions

Electrons

• Design a rollercoaster• Include some loop the loops!• Work out GPE - Use 10g as the mass (turn

it into 0.01kg), and g=10 m/s2

• Ext: Work out acceleration both times, assuming it starts at 0m/s at the top, and by timing its fall

• EXT 2: Using 15N as force, calculate work done as it falls

On your paper design yours/a rollercoaster, including heights. You must have 2 drops

For each loop, work out GPE and KE, using mass as 50g (0.05kg) . Best name wins sweets!

Using working, draw a Velocity/time graph for each loop

Label the work done (if force is 15N)Label centripetal force and velocities

EXT: How much otherphysics can youinclude on it?E.g. Terminal

velocity..

Gallery.

Questions 17-18, 25-29, 37-40

Write one of your own on the post-it