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Key Stage 3 Science
| Question | Answer |
|---|---|
| Define a force | A force is a push or a pull |
| What is the unit of force | The unit of force is the Newton |
| What is the symbol for the unit of force | The symbol for Newton is N |
| Describe contact forces | Objects exert a force on each other only when they are in contact with each other. |
| State four examples of contact forces | 4 examples of contact forces are:Friction, air resistance, water resistance and normal reaction |
| Describe non-contact forces | Objects exert a force on each other without coming in contact with each other. |
| State 3 examples of non-contact forces | Three non-contact forces are: Gravity, Magnetism and Static Electricity |
| What are the 4 effects a force can have on objects? | A force can cause an object to change: Size, shape, speed or direction. |
| Define mass | The amount of matter in an object |
| Define weight | The pull of gravity on an object |
| Name 3 forces that act in opposition to motion | Three forces acting in opposition to motion are : friction, air resistance and water resistance. |
| Where an object has the greater weight, on the Earth or on the moon? | The weight of an object is greater on earth than on the moon |
| What is the reason to your answer to question 12? | The strength of gravity is greater on the Earth than on the moon |
| Which type of surface produces more friction, a rough surface or a smooth surface | Rough surfaces produce more friction |
| Which type of energy is usually generated when friction is present? | Thermal energy is usually present with friction. |
| What is the resultant force when balanced forces act on an object? | The resultant force is 0N |
| What are the two possible condition when balanced forces are action on an object? | 1 The body is stationary, 2 The body moves with constant velocity. |
| What happens when unbalanced forces act on an object? | There is a change in motion |
| State two possible ways your answer to number 3 may present itself. | Change in speed or change in direction |
| What is the name of the instrument used to measure weight in a lab? | Newton meter or force meter |
| How are forces represented? | Using straight line with an arrow |
| What does each part tells us? | The straight line is proportional to the size of the force and the arrow indicates direction. |
| Calculate the resultant force acting on the object with 5 N to the left and 8 N to the right | 8N – 5 N = 3 N to the Right |
| Define elastic materials | Materials that return to their original shape when force is removed. |
| Define inelastic materials | Materials that do not return to their original shape when force is removes |
| What is the equation for extension? | Extension = final length – initial length |
| What is the equation for pressure? | Pressure = Force /Area |
| What is the unit of pressure? | N/m2 |
| What is the equation for calculating upthrust? | Upthrust = weight in air – apparent weight in liquid |
| For a mass of 500g on Earth what is its weight? | 5N |
| What is the unit for force? | Newton |
| Name the apparatus used to measure forces | Newton meter |
| Define "force" | A push or a pull that acts on an object due to the interaction with another object |
| Define "contact force" | A force that acts when objects are physically touching |
| Define "non-contact force" | A force that acts when objects are physically separated |
| Name five examples of contact forces | Friction, air resistance, tension, compression, normal contact force |
| Name three examples of non-contact forces | Gravitational force, electrostatic force, magnetic force |
| Define "resultant force" | Single force that can replace all the forces acting on an object and have the same effect |
| Name two things that could happen when the forces on an object are balanced | Object remains at rest, object remains at constant speed and direction |
| Name four things that could happen when the forces on an object are unbalanced | Object accelerates (speeds up), decelerates (slows down), changes shape, changes direction |
| What would the resultant force on an object be if the forces are balanced? | Zero |
| What is the name of the diagram used to represent the forces acting on an object? | Free-body diagram |
| Define "friction" | Force opposing motion which is caused by the interaction of surfaces moving over each other |
| Define "drag" | Friction force when one object is a liquid or a gas |
| Define "tension" | Force extending or pulling apart |
| Define "compression" | Force squashing or pushing together |
| Define "normal contact force" | Push force acting between two solid objects |
| Define "air resistance" | Friction force acting between an object and air particles |
| State two examples of situations where it is useful to reduce friction | Sports, vehicles |
| State two ways of reducing friction or drag | Make objects streamlined, use lubricants |
| State Newton's Third Law | When two objects interact, the forces they exert on each other are equal and opposite |
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Davenant Foundation School
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