Unit 6 Forces and movement
START
Index
How do objects move on land?
How do objects move in water?
How do objects fly?
What effect does transport have on the environment?
1.
How do objects move on land?
Definition and types
A force is an action that changes or maintains the motion of a body or object. Simply stated, a force is a push or a pull. Forces can change an object’s speed, its direction, and even its shape. There are 2 types of forces:
- Contact forces: the force between 2 objects that are in physical contact.
- Non-contact forces: the force between 2 objects that are not in physical contact.
Friction
It is a type of contact force. It is a force created when an object moves against another object and causes resistance. Friction helps objects to slow down, to go faster or to stop completly. There are 2 types of forces:
- Sliding friction: it happens when an object moves across a solid surface.
- Rolling friction: it happens when a round object rolls on top of a solid surface.
- Fluid friction: it happens when an object meets a liquid or gas as it moves.
- Static frinction: it happens when the applied force is such that an object remains stationary relative to the surface.
2.
How do objects move in water?
Definition
Objects that on the water must be able to float. Objects that float can then move forward using different types of forces. Density is an important factor in how ships float. Density is the measure of how much of a certain type of matter there is in a specific size of space. The shape of the boat will also increase or reduce the density.
Definition
How do boats move?
Friction is an important factor in relation with the speed of the floating objects. When there is less friction the objects move faster and when there is more friction the objects move slower. The shape of the boat also affects the friction that experiences, large boats has less density than short ones.
Boats use push and pull forces to move. There are different types of forces that move the different vehicles in water.
How do boats move?
3.
How do objects fly?
Definition
An object needs 4 forces to fly: Lift: force that pushes the object up. The weight of this force must be the same as the weight of the object. It keeps the object up. Thrust: the force that keeps an object moving forward and stops it from slowing because of air resistance. There are different methods to produce thrust. Drag: the force that slows the plane down. Weight: it forces the plane down and it is caused by gravity.
Air preasure and streamlined shape
- A plane's engine produces a force that moves it forward. As the plane moves, the air passes above and below its winds. The air below the wing moves slowly and the pressure is higher. This causes the upward force.
- The shape of a plane helps to minimise air resistance by allowing the air to pass by more easily. This is called a streamlined shape.
4.
What effect does transport have on the environment?
Definition
- Many types of transport use fossil fuels that produce carbon dioxide and other gases. These gases pollute the air and water. Moreover, they are non-renewable sources that will disappear in the future. Some examples of them are: coal or natural gas.
- Cars emit more CO2 every year than planes, as there are more cars than planes.
- The carbon footprint is the amount of CO2 produced per person per km.
- These emissions affect the planet Earth. For this reason, scientists and engineers are trying to make transport more eco-friendly.
- One of the lternative sources is the biofuel that it is made from natural waste.
U6 FORCES NNSS
Isabel
Created on April 12, 2024
Start designing with a free template
Discover more than 1500 professional designs like these:
View
Memories Presentation
View
Animated Chalkboard Presentation
View
Chalkboard Presentation
View
Witchcraft Presentation
View
Sketchbook Presentation
View
Vaporwave presentation
View
Animated Sketch Presentation
Explore all templates
Transcript
Unit 6 Forces and movement
START
Index
How do objects move on land?
How do objects move in water?
How do objects fly?
What effect does transport have on the environment?
1.
How do objects move on land?
Definition and types
A force is an action that changes or maintains the motion of a body or object. Simply stated, a force is a push or a pull. Forces can change an object’s speed, its direction, and even its shape. There are 2 types of forces:
Friction
It is a type of contact force. It is a force created when an object moves against another object and causes resistance. Friction helps objects to slow down, to go faster or to stop completly. There are 2 types of forces:
2.
How do objects move in water?
Definition
Objects that on the water must be able to float. Objects that float can then move forward using different types of forces. Density is an important factor in how ships float. Density is the measure of how much of a certain type of matter there is in a specific size of space. The shape of the boat will also increase or reduce the density.
Definition
How do boats move?
Friction is an important factor in relation with the speed of the floating objects. When there is less friction the objects move faster and when there is more friction the objects move slower. The shape of the boat also affects the friction that experiences, large boats has less density than short ones.
Boats use push and pull forces to move. There are different types of forces that move the different vehicles in water.
How do boats move?
3.
How do objects fly?
Definition
An object needs 4 forces to fly: Lift: force that pushes the object up. The weight of this force must be the same as the weight of the object. It keeps the object up. Thrust: the force that keeps an object moving forward and stops it from slowing because of air resistance. There are different methods to produce thrust. Drag: the force that slows the plane down. Weight: it forces the plane down and it is caused by gravity.
Air preasure and streamlined shape
4.
What effect does transport have on the environment?
Definition