Matter and Heat
__________ is what everything around us is made from.
Matter
True or False: Heat moves between objects.
True, heat moves between a hotter object and a cooler object.
True or False: An airplane is an example of a complex machine.
True, an airplane is a complex machine because it has many parts.
_____________ changes are when the properties of matter change, but it's composition does not.
Physical (changes)
Matter can change because it has ___________.
Energy
True or false: A force cannot cause an object to change shape permanently.
False: A force can change the shape of an object permanently, or only when the force is applied.
____________ are devices that need energy to use or direct a force.
Machines
____________ is the amount of matter a substance has. We measure it with scales.
Mass
True or False: Water increases in volume and takes up more space when it gets hotter.
False, water increases in volume when it gets colder and freezes into a solid form (ice).
What is a contact force?
A contact force is a force that acts when objects touch each other.
A wheel is an example of a ____________ machine.
Simple (machine)
What type of change is a change of state?
Physical Change
What type of energy is heat?
Thermal
Gravity and magnetism are both examples of _____________ energy.
Remote energy: Energy that acts without touching objects
Name two types of simple machines.
Pulley, wheel, ramp, lever
What tool do we use to measure volume?
Beakers
What are two of the changes that take place when objects exchange heat?
Temperature changes: An object gets warmer if it receives heat from another object. It gets colder if it gives heat away.
Changes of state
Dilation: When some objects get hotter, their volume increases and they take up more space.
A force is an action that ___________ or ____________.
A force is an action that makes an object move or changes it's direction or shape.
Give an example of a complex machine.
Cell phone, car, airplane, household appliance