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Bella S2
Forces
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 are the units of density? | grams per cm 3 |
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 are the units for density? | grammes per cm 3 or g/cm3 |
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. |