Define a force. What unit are forces measured in? How can we measure a force?

Objectives Know what balanced and unbalanced forces are. Understand the effect if forces are balanced and unbalanced. Outcomes (4) Draw diagrams to represent balanced and unbalanced forces. (5) Calculate resultant forces. (6) Explain the effects of balanced and unbalanced forces on objects. Key terms: Force, Newton, balanced, unbalanced, resultant.

Balanced Forces produce NO change in Movement Unbalanced Forces Change the Speed and or Direction of Moving Objects Balanced and Unbalanced Forces The forces on the person are balanced The floor pushes upward on the person Weight pulls downwards on the person Greater Force Smaller Force

D A B C Resistance Weight Resistance Weight Which diagram is correct? Why? Resistance

THRUST DRAG & FRICTION What is the bicycle doing? C A B D Not moving Slowing down Speeding up Moving at constant speed

If the swimmer is floating, which diagram is correct? WEIGHT TURBULENCE DRAG UPTHRUSTRESISTANCE B AED

WEIGHT DRAG B A C D Hovering in the air Falling at constant speed Slowing down Speeding up (plunging to a horrible death) What is the parachutist doing?

Which diagram shows a balloon floating at a constant height? WEIGHT UPTHRUST WEIGHT UPTHRUST WEIGHT UPTHRUST WEIGHT DRAG D ABC

THRUST DRAG & FRICTION Which car is slowing down? C AB D

TITANIC WHITE STAR LINE Which statement is not correct? The Titanic is sinking because the upthrust on it is less than its weight The iceberg is floating because the upthrust on it is equal to its weight The Titanic is sinking because there is less upthrust on it than there is on the iceberg The Titanic weighs less than the iceberg B A C D WEIGHT UPTHRUST

Copy the diagrams below, adding arrows to show ALL the forces acting on the object indicated A stone in a beaker of water An ice skater moving at constant speed A plane accelerating forwards in the air WEIGHT RESISTANCE UPTHRUST WEIGHT RESISTANCE THRUST FRICTION & DRAG DRAG THRUST WEIGHT LIFT

Task Answer the questions on the worksheet. Outcomes (4) Draw diagrams to represent balanced and unbalanced forces. (5) Calculate resultant forces. (6) Explain the effects of balanced and unbalanced forces on objects. Key terms: Force, Newton, balanced, unbalanced, resultant.

Peer review Exchange sheets. Mark the other persons sheet, give them a total mark. Clearly write who has marked the work. Outcomes (4) Draw diagrams to represent balanced and unbalanced forces. (5) Calculate resultant forces. (6) Explain the effects of balanced and unbalanced forces on objects. Key terms: Force, Newton, balanced, unbalanced, resultant.

In which direction will these stationary objects move? Will it move?

Force Newton Meter Friction Density Balanced Unbalanced Gravity Weight Mass Kilogram Speed Metres per second Volume Upthrust