# Miss

Topics: Force, Friction, Drag Pages: 2 (380 words) Published: June 23, 2013
Falling objects increase their speed as they fall, because their weight (the force of gravity) pulls them to Earth. They also experience an upward force called air resistance (drag), which slows them down. Objects fall faster until they reach their terminal speed, which is reached when the upward (air resistance) and downward (weight) forces are equal. Falling objects

When an object is dropped it gets faster and faster as it falls. This happens because their weight (the force of gravity) pulls them down towards the centre of the Earth. As they fall through the air, they also experience an upward force called air resistance (drag).

RAF parachutist
Objects with large surface areas, such as parachutes or shuttlecocks fall more slowly because they experience more air resistance. Frictional forces such as air resistance, friction and drag act against the direction of motion, so tend to slow the object down. This fact is put to good use in the design of the parachute and shuttlecock. The size of frictional forces can be reduced bystreamlining the object or lubricating any moving parts. Reducing frictional force

Examples of reducing frictional force by streamlining include: * A sports car is wedge-shaped to reduce air resistance and so increase top speed. * Lorries and caravans have deflectors to reduce both air resistance and fuel consumption. * A car with a roof box has increased air resistance and fuel consumption and a lower top speed. * A downhill skier puts wax on the skis to reduce friction and so increase the top speed. Terminal speed

When objects fall through the Earth's atmosphere they get faster and faster until they reach a speed where the upwards force (air resistance) and downwards force (weight) equal each other. At this point the object travels at its fastest speed called terminal speed. What happens when you drop a coin and small feather at the same time? They both have a similar surface area but the feather weighs less so has a...