Gr 3-Definitions
What is force?
A push or a pull
List 2/3 natural forces
Electromagnetic
Gravity
Magnetic
What is a simple Machine?
a basic tool to help us complete work
Name 3 simple machines
Screw, inclined plane, pulley, wheel and axel, wedge, lever, inclined plane
On a bicycle, where do you input force into the bike?
Where do you put force into the bike?
The pedals
What are 2 things that can protect you from a natural force?
Helmet, kneepads, seatbelt
Which example is considered muscular force?
a) A coconut falling
b) paper sticking together
c) A Squat
d) An earthquake
c) A Squat
What is a complex machine?
2 or more simple machines
What is a pully used for?
To lift things up
On a bicycle, where is the output of force?
Where does energy come out of the bike?
The back wheel
What is a push?
A force that makes something go further away
Which object would not be attracted to a magnet?
a) Iron nail
b) Steel pin
c) Nickel coin
d) Gold ring
d) Gold ring
What is a mechanism?
Systems in a machine that change or modify a motion.
Name 2 examples of a pully system.
Crane, well, elevator
Name 2 examples of a gear system.
Bike, car, clock
What is a pull?
A force that brings something closer.
What force that acts on objects that rub against each other.
Friction
How do machines negatively impact our world?
Give an example.
Cars pollute our environment with gas
Pullys are an example of a linear or rotary motion?
Linear-motion that happens in a straight line
Gears are an example of a rotary or linear system?
Rotary- rotate in a circular motion
Why can people float in space?
There is very little Gravity
What force happens with charged objects.
Electrostatic
They help us do things.
Ex. Car helps us go places faster
True or false?
A moveable pully has a wheel that can move.
True
How can we change speed, direction and torque?
Gears