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# Bella S2

### Forces and space

What is a force a push, pull or twist on an object
What are the units of Force Newtons (N)
What is the symbol for force F
What can a force do to any object? Change its speed shape or direction
What are the units of distance? m or cm
What word do we use to describe the forces acting on an object if it is at rest? Balanced
What are the units of acceleration? M/S2 or MS-2
What is the word we use to describe the forces acting on an object that is slowing down? Unbalanced
What is the relationship between pressure and surface area? The smaller the surface area the greater the pressure OR the greater the surface area the smaller the pressure
What is the formula for Pressure? P=F/area
What are the units of pressure? N/cm2
What can you do to the texture of the surface of an object to reduce friction? make it smoother
What is the force of gravity on Earth? 10 N/kg
What name do we give for the force that is generated when 2 objects rub together? Friction
What word is used to describe an object whose speed keeps on increasing? Accelerating
Does a tack produce higher or lower pressure at its pointy end compared to the flat end? Higher
What is the name for the type of friction generated between an object and the air Air resistance
Does a tack produce higher or lower pressure at its flat end compared to the pointy end? Lower
How can you increase air resistance Increase the surface area of the object (OR make object rougher)
Why does a tack produce lower pressure at its flat end? It has a greater surface area
If the forces acting on an object are unbalanced, what happens to the object? It either accelerates or decelerates
What is the formula for weight W=mg
What is the relationship between and area and pressure The GREATER the area the LOWER the pressure [Or] The lower the area the greater the pressure
What can you do to the shape of the surface of an object to reduce friction? Make it more streamlined (more pointy)
What happens to a Liquid that is MORE dense than the liquid it is placed in? It sinks
What is more dense a solid substance or a liquid substance? Solid
What happens to a solid that is LESS dense than the liquid that it is placed in? It floats
What happens to a solid that is MORE dense than the liquid it is placed in? It sinks
What happens to a liquid that is LESS dense than the liquid that it is placed in? It floats on the surface.
What is the formula for pressure? P=F/A
Does your mass change if you were to visit different planets? No mass stays constant during space travel.
What happens to an object when a balanced force is applied to it? It is stationary or moving at a constant speed.
Why are there seasons on Earth Because the poles are not vertical they are tilted off their axis
When is the name for when there is an equal length of day time and night time Equinox
Other than temperature and lack of oxygen, what is another main environmental hazard of space travel? Radiation
What part of the electromagnetic spectrum has the largest wavelength? Radio waves
What part of the electromagnetic spectrum has the smallest wavelength? Gamma rays
What 2 part of the electromagnetic spectrum can cause cancer? Gamma and X - rays
Where would you find a receiver for microwaves? mobile phones
What can be used to detect X-rays? photographic film
What is used to detect gamma rays? Geiger-Muller tube
What can Ultraviolet waves be used for? To detect fake banknote or sunbeds
Created by: nscobie

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