Forces
What is the transfer of one energy to another?
Force
Why did people invent machines?
To make work easier
What is the difference between compound and simple machines
Compound machines consist of different parts
What is the electric charge through a material called?
Electric current
What are the poles of a magnet called?
North and south
True or false: A force can change an objects motion.
True
What is a lever?
A rigid bar that rests on a fulcrum
What do we use a wheelbarrow for?
To move things with less effort
What is a device that produces energy called?
A generator
Magnetism
True or false: A force cannot cause changes in shape.
False
What do we use a pulley for?
To lift weights
Name another example of a compound machine.
Ex. washing machine, etc
What are materials that do not allow electric currents to pass through them called?
Insulators
What is an electromagnet?
A magnet that runs on electricity
What type of force requires the object to touch to exert force?
Contact force
What is a ramp that connects two surfaces of different levels called?
An inclined plane
What does a hoist do?
Lifts weights more easily than just one pulley
What are materials that let electric currents pass through them called?
Conductors
True or false: it is possible to magnetise a steel object bu rubbing it many times against a magnet.
True
What type of force does not require objects to touch?
Non-contact force
What is a disc-shaped objects that rotates around an axis called?
A wheel
What happens when a cog of a gear turns?
All the others turn so the gear generates motion.
What is a set of interconnected parts for generating, distributing, and using electric currents called?
An electric circuit
How do you turn off an electromagnet?
By disconnecting the battery or power source