A mixture that looks like a single substance is a...
solution
100
How can you separate salt from water in a salt-water solution?
I can use evaporation to separate salt from water.
100
Explain which type of energy a falling apple gains and which it looses.
As an apple falls from rest, its gravitational potential energy is converted to kinetic energy. The apple gains kinetic energy and looses potential energy as it gets closer to the ground.
100
The longer a rubber band is stretched, the .... elastic potential energy it has.
MORE
100
When I rubb my cold cheek after having spent some time outside the energy is converted from...
mechanical to thermal energy
200
A mixture in which the substances are evenly spread out is a...
solution
200
How can you easily separate paper clips from marbles?
magnet
200
The amount of kinetic energy an object has is connected to the object´s ... and ... .
mass and speed
200
A force acting on an object may cause the shape of an object to change. Elastic objects can store ... if they are stretched.
A drawn bow is able to store energy as the result of its position. When assuming its usual position, there is no energy stored in the bow. Yet when its position is altered, the bow is able to store energy. This stored energy is referred to as...
elastic potential energy
200
When a falling apple, a falling pencil, a falling stone or any other falling object reaches the ground, another type of energy is produced. This type of energy is called...
sound energy
300
A compound is...
...made of atoms that are joined together.
300
Little paper pieces fell into Tim´s soup. How can he separate the paper from the soup?
He collects the paper pieces.
300
Kinetic energy is the energy of ...
motion.
300
Elastic potential energy can be stored in what type of items?
rubber bands, bungee chords, trampolines, an arrow drawn into a bow
300
A lunch box resting on the edge of a table has what type of energy?
gravitational potential energy
400
A solute is...
...the substance that dissolves in the solvent (e.g. water) to make a solution.
400
Jonny pourred chocolate powder in his milk. What helps the solute (powder) to dissolve in the solvent (milk) more quickly?
Stirring the mixture
400
Kinetic energy is
- mechanical energy
- the energy of position
- the ernergy of motion
energy of motion
400
The amount of elastic potential energy stored in an object is related to the amount of stretch of the object - the more stretch, the ..... stored energy.
MORE
400
Which of the following is an example of elastic potential energy?
- students running
- a book resting on the ground
- a parked car
- a fish swimming
- a stretched rubber band
stretched rubber band
500
The solvent is...
...the substance in which the solute (e.g.: sugar or salt) dissolves.
500
Relate the following with the correct terminology:
Sugar dissolves in my tea to form a mixture in which the substances are evenly spread out.
A solute dissolves in a solvent to form a solution.
500
When a hammer hits a nail, kinetic energy is converted to...
Hint: This type of energy can be detected by the ears.
sound energy
500
When a pen that was initially at rest on a table falls to the ground, potential energy changes to kinetic energy. This change from one form of energy to another is called...
energy conversion
500
An iron hammer on its own, has no kinetic energy.
To drive a nail into a piece of wood (which is work), you have to lift the iron hammer up, (gravitational potential energy because if hammer´s position).
And then you force it to move at great speed downwards (now the hammer has kinetic energy) to hit the nail.
The sum of the potential and kinetic energy that the hammer acquired to drive in the nail is called the ... which resulted in the work done.