15 terms

Year 7 Forces and Magnets - Mr. Hung

What are the two types of forces?
Contact & Non-contact
Name 3 types of non contact forces
Magnetic Force
Electrostatic Force
When you drop a ball, what two contact forces are acting on it and in what directions?
Gravity - acting downwards and Air Resistance - acting upwards
What are the two types of magnets?
Permanent Magnets and Temporary Magnets
If you have two magnets, Which ends will be attracted to each other and which ends will repel?
Opposites (North and South) will attract and Like (North and North or South and South) repel
What is an electromagnet? Provide an everyday example of one.
A magnet that is only magnetised when electricity is passing through it eg. a doorbell
What is all matter made of?
What 3 things make up atoms?
Neutrons, Protons, Electrons
Which particles in an atom have a positive charge and which have a negative?
Protons have a positive charge and Electrons have a negative charge
If an atom has more protons than electrons what charge will the atom have?
What two ways can an object lose electrons?
Contact and Friction (rubbing)
If you have a positively charged object and it moves towards a positively charge objects what will happen?
The second object will repel.
If you increase the size of a parachute what happens to the forces acting on the parachuter?
Air resistance will increase but gravity stays the same so the object will fall slower.
What is the difference between mass and weight? Which will change if you are outside the earth?
Mass is the amount of matter (atoms) that an object is made of and weight is a measure of the amount of gravity acting on the object. Your weight will change because there is less gravity but you are still made of the same amount of matter.
What upward force acts on an object in water?