What is energy?
The ability to do work
What are simple machines?
MACHINES WITH ONE OR A FEW NUMBER OR PARTS THAT HELP US MOVE OR LIFT THINGS
What are complex machines?
MACHINES MADE BY MANY PARTS THAT NEED FUEL OR ELECTRICITY TO WORK
The most common magnetic material
IRON
TRUE OR FALSE - The Earth has a stronger force of gravity than the moon
TRUE
Which one of these would you use to remove a box from a truck? A: a lever / B: an inclined plane / C: a wheel and an axle / D: a pulley
B - AN INCLINED PLANE
In what direction does a magnetic field flow?
IT FLOWS FROM THE NORTH POLE TO THE SOUTH POLE
Name an object that changes shape temporarily
SPONGE, RUBBER BAND, PLAYDOH...
A material that has an area of magnetic force around it
MAGNET
Friction produces _______
HEAT
The ability of a material to return to its original shape after being compressed or stretched
ELASTICITY
Gravity is this type of force
PULLING
What are forces?
Something that can make an object start moving, stop moving, change shape or break
Does gravity change?
NO, IT REMAINS THE SAME
What do we call the forces that act at a distance?
NON-CONTACT FORCES
Some forces can act over a distance, and others canonly act by contact. Which type of force can act only when two objects touch each other? A: Gravitational / B: Frictional / C: Electrostatic
B - FRICTIONAL
When do we apply force to an object?
Whenever we push or pull it
The force that pulls everything towards the Earth is called...
GRAVITY
This is a type of wheel with a rope that is used to lift or lower heavy objects
PULLEY
We use it to regulate the temperature at home
THERMOSTAT
What simple machine do we use to lift heavy objects easier?
A LEVER
The energy possesed by a moving object is kinetic or potential?
KINETIC
Name everyday activities where we use friction
WALKING, RUNNING, JOGGING, DRIVING A CAR, RIDING A BIKE....
Where do we get access to news and information?
INTERNET
What do magnets have?
THEY HAVE MAGNETIC FORCE
Name two simple machines that helped Egyptians to built the pyramids
WHEELS, LEVERS, PULLEYS, INCLINED PLANES
Which has more friction: rough or smooth surfaces?
ROUGH SURFACES