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Bella S2
Forces and space
| Question | Answer |
|---|---|
| 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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