4 Swamp buggy ACTION What helps a swamp buggy move through swampy terrain
How do you explore land that’s thick with plants and covered in sticky mud and water This is swampland and one great way of travelling through it is by swamp buggy This vehicle can move over the thickest bog It uses large tires with paddle-like treads or caterpillar tracks wrapped round them These give the buggy excellent traction or grip in slippery conditions ANSWER TRACTION Traction describes how one object can grip onto another Many objects have rough edges which give them grip but on a slippery surface the traction may need to be increased This is done by adding grooves and ridges to the surface Some tires for example have ridges on them that act like paddles belt-like caterpillar track Wide caterpillar tracks or treads as they are known can have ridges or studs added to the surface to make them rougher and more able to grip studs 5
6 If you want to explore the huge game reserves of Africa or cross the desert country of America you can use a safari jeep It’s built to cross the grasslands and plains that are home to wild animals such as wildebeest lions and rhinoceros It also has the off-road ability to tackle dry riverbeds and rocky canyon valleys Safari jeep ACTION What softens the bumpy ride for the passengers Safari jeeps are four-wheel drive which means all four wheels are connected to the engine This increases traction or grip on rough surfaces Then the suspension has large springs to help soften the bumps and give passengers a smoother ride
WORKING PARTS tough suspension knobbly tires A roll cage that covers the seats adds to passenger protection Jeeps also carry safety equipment such as an ax shovel water and first aid kit ANSWER SPRINGS Springs are usually shaped like a coil When they are either stretched or compressed squeezed they create a force that pushes in the opposite direction That’s because the spring tries to get back to its original shape the spring is stretched which also gives it energy to spring back to shape the spring is squeezed which gives it energy to spring back to shape the spring as it normally is 7
