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Science-forces
Forces for 2015 yearly exam
Question | Answer |
---|---|
What is a force? | A pull, push or twist. |
What does force change? | the speed, direction or shape of an object. |
what are 2 contact forces? | buoyancy and friction. |
What are 3 non-contact forces? | Gravity, magnetic and electrostatic. |
What is an unbalanced force? | a force where one force is greater than the other. |
what is friction? | The force between two sliding objects that slows them down. |
What is gravity? | a force that acts between any two objects. |
What effects the size and strength of the magnetic field? | The mass of the object. |
What is mass? | the measurement of how much of a substance there is. |
What is mass measured in? | Kg |
What is weight? | The measurement of the gravitational force pulling you down. |
What is weight measured on? | Neutrons/ N |
What can pull an object without touching it? | magnets |
What do all magnets have? | A north and south pole. |
What poles of the magnets attract? | Opposites. |
What are the three metals that are attracted to magnets? | Cobalt, nickel and iron. |
What is the magnetic field? | the area around the magnet where the magnetic force acts. |
How are the particles that flow through the circuit charged? | negatively |
What is an electromagnet? | A magnet that can be turned on or off with a switch. |