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Forces and movement
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true or false? the shape of a boat has an effect on the amount of friction it experiences
true; boats can move faster through the water depending on their shapes.
name one form of transport that is more eco friendly
electric car
what is an alternative renewable energy source made from natural waste?
biofuel
are fossil fuels renewable or non renewable energy sources?
NON RENEWABLE ENERGY SOURCES, they will disappear in the future
From the pie chart on page 108 which form of transport produces the most CO2 globally in a year?
Cars at 42 %
What produces carbon dioxide and other gases that pollute the air and water?
Fossil fuels
Why do airplanes have a streamlined shape?
The shape of the plane helps minimize air resistance
Explain the difference in air pressure above and below the wing of a plane?
Air passes above and below the wings of the plane. The air below the wing moves slowly so the pressure is higher; This causes an upward force.
What two forces does an object need to fly?
lift and thrust
How can a steel ship float? Explain.
Steel ships are heavy but they are large. Density is mass/ volume. Steel ships have a large volume so their density decreases
The mass of an object divided by its volume is called what?
density
objects that move on the surface of water must be able to ______
float
Give an example of fluid friction
Swimming
Give an example of rolling friction
Skateboarding
Give an example of sliding friction
Snowboarding
What are the three kinds of friction?
Sliding friction, rolling friction, and fluid friction
Give an example of a non- contact force
gravity
What is the difference between contact forces and non contact forces?
Contact forces are when there is physical contact with an object, non contact forces do not need to have physical contact for an object to move
What is the name for the force that makes an object slow down or stop?
Friction
Forces, such as _______ and ________ cause objects to move
pushing and pulling
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