Science Chap9.2
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18 Terms
Forces acting between two objects that are in physical contact with eachother are called..
contact forces
what are examples of contact forces?
elastic force
friction/frictional force
What is friction?
Friction is the force that opposes motion between two surfaces in contact. It is the force that allows us to hold on to things without dropping them.
What is elastic force?
Elastic force is the force acting on a stretched/compressed elastic object to return to its original shape.
What happens when an elastic material is stretched/ compressed?
Elastic materials resist the change in shape by exerting a force in the opposite direction.
What is gravitational force?
It is a force that attracts two objects to eachother.
Earth’s gravitational force pulls everything to the…
centre
Define magnetic force.
It is the force exerted between a magnet and a magnetic material or another magnet.
what happens when unlike poles are brought close?
they pull together due to the magnetic force of attraction.
what happens when like poles are broguht close?
they push apart/ repel due to the magnet force of repulsion.
what is weight?
weight is the measure of the gravitational force acting on an object
what is the SI unit of weight?
newton (N)
what is mass?
Mass is the amount of matter in an object.
what is the SI unit of mass?
kilogram (kg)
How can the weight of an object change?
It may change with its location.
How can mass change?
Mass cannot change and remains constant regardless of its location.
What can be used to measure weight?
spring balance
what can be used to measure mass?
electronic balance
beam balance