FORCES+CAUSE+MOVEMENT

IGCSE PHYSICS > FORCES AND MOTION > FORCES, MOVEMENT AND SHAPE

 * ~ 1 FORCES ||~ 2 ELECTRICITY ||~ 3 WAVES ||~ 4 ENERGY ||~ 5 SLG ||~ 6 MAGNETISM ||~ 7 RADIOACTIVITY ||

Definition Types Vectors || FORCES CAUSE MOVEMENT Friction F=ma Terminal velocity || FORCES CHANGE MOMENTUM Momentum Car safety Newton's 3rd law || FORCES CAUSE TURNING Moments Centre of Gravity Beam on trestles || FORCES CHANGE SHAPES Stretching ||
 * JUST FORCES

FORCES CAUSE MOVEMENT
1.13 understand that friction is a force that opposes motion ACTIVITY: USE THESE SIMULATIONS TO INVESTIGATE FRICTION, EITHER CLICK ON THE LINKS OR DOWNLOAD FROM STUDYWIZ (FASTER IF YOU ARE IN SCHOOL!) [|PHET FRICTION SIMULATION] [|PHET FORCES IN 1 DIMENSION SIMULATION] Compare what happens when you push the objects with and without friction.

ACTIVITY TO USE THE 'FORCES IN 1D' SIMULATION TO INVESTIGATE THE RELATIONSHIP BETWEEN FORCE AND ACCELERATION Create a spreadsheet: Acceleration due to different forces.xls (see below). Switch off friction. For one of the objects in the sim (your teacher may tell you which one), apply a range of forces and observe how the velocity changes over 10 seconds. Calculate the acceleration. Plot a graph of Force/N against Acceleration/ m/s 2 (you may have to switch the columns). Calculate the gradient of the graph. CONCLUSION: What is the relationship between F and a?

1.14 recall and use the relationship between unbalanced force, mass and acceleration: EXAMPLES FOR F=ma 1 What force is needed to stop a skier of mass 60 kg with a negative acceleration of -2.5 m/s 2 ? 2 A force of 300N is exerted on a mass of 500 kg. What is the acceleration? 3 What is the mass of a moon rock if it accelerates at 1.7 m/s 2 when pulled by a gravitational force of 680 N?

1.15 recall and use the relationship between weight, mass and g:

1.16 describe the forces acting on falling objects and explain why falling objects reach a terminal velocity



LINKS TO TRAFFIC ACCIDENT VIDEOS (NO-ONE IS HURT) - on youku, only in mainland China BROTHER GYMNAST media type="custom" key="11168926" BROTHER TRICYCLE media type="custom" key="11168916"

1.17 describe the factors affecting vehicle stopping distance including speed, mass, road condition and reaction time SEE ECHALK SIMULATIONS (get the school login from your teacher) [|STOPPING DISTANCE] [|ULTIMATE REACTION TEST] [|SAFE DRIVING]