Rollercoaster Rollercoaster PhysicsPhysics

Chapters 1-8Chapters 1-8

Moving the cart up the Moving the cart up the hillhill

• The force exerted over a certain distance is called WORK

• Work (Joules)= Force (Newtons) X Distance Work (Joules)= Force (Newtons) X Distance (Meters)(Meters)

• How much work is required to lift the 1000 N cart to How much work is required to lift the 1000 N cart to a height of 20 m??a height of 20 m??

• Is the man in the black jershey doing any work? Is the man in the black jershey doing any work? WHY OR WHY NOT?WHY OR WHY NOT?

The “speed” of workThe “speed” of work

• The amount of work done over a period of time is called POWER

• Power is measure with WATTS

• Lifter lifts the weight in a shorter period of time (POWER LIFT)

Watch the two videos and imagine the highest point of the Watch the two videos and imagine the highest point of the pyramid and the height needed to lift the pool over the house pyramid and the height needed to lift the pool over the house are the same. In which scenario is MORE WORK being done??are the same. In which scenario is MORE WORK being done??

See what you know…See what you know…• Work on Page 19-20 in your workbooks• TAPE page 19 in your composition notebook

AFTER we go over it in class

• **Things to keep in mind for 1-4: If the amount of work remains the same, an increase in force will result in decrease of distance and vice versa

• **Things to keep in mind for #5: Gravity PULLS objects down at a rate of 9.8 m/s²

At the TOP of the At the TOP of the hillhill

The DescentThe Descent

-Gravity PULLS the cart down Gravity PULLS the cart down

-The passengers experience an ACCELERATION as they start their The passengers experience an ACCELERATION as they start their

descent AND as the slow down when approaching the next turn and hilldescent AND as the slow down when approaching the next turn and hill

-The change in MOMENTUM (velocity x mass) causes the passengers to The change in MOMENTUM (velocity x mass) causes the passengers to

be PUSHED against their seatsbe PUSHED against their seats

-The length of TIME that gravity pulls on the cart is called an IMPULSEThe length of TIME that gravity pulls on the cart is called an IMPULSE

The LoopThe Loop-Feeling of Weightlessness Feeling of Weightlessness (ALL forces are balanced); (ALL forces are balanced); as soon as there is an as soon as there is an unbalance, the feeling goes unbalance, the feeling goes awayaway-Potential Energy Potential Energy increases increases as the cart goes up the hill; as the cart goes up the hill; Kinetic energy Kinetic energy increases as increases as cart goes DOWN the hillcart goes DOWN the hill