Simple Machines
Draw a wheel on the blackboard.
(Draw a wheel!)
In class, we talked about three inventions that changed over time. What were they?
The phone, the car, and the boat.
True or false: gravity is an invisible force.
True!
True or false: gravity is a non-contact force.
True!
What type of fruit hit Isaac Newton's head when he discovered gravity?
An apple.
Draw an inclined plane on the blackboard.
Draw that inclined plane!!
A big factory creates a lot of smoke. The clouds near the factory are grey, not white. What type of pollution does the factory create?
Air pollution
True or false: gravity ONLY pulls things to the centre of the Earth. Gravity doesn't pull things towards the Sun or the Moon.
False!
When my friend passes me a ball and I kick it, the ball:
a) stops moving
b) changes direction
c) starts moving
b) changes direction
Using simple machines requires:
a) more effort
b) less effort
b) less effort
True or false: when you pull down on the road of a pulley, the load goes down.
False! It goes up.
Name three inventions that changed over time. These three inventions CANNOT be the phone, the car, or the boat.
Correct answers include:
computer
toilet
television
radio
bicycle
etc.
Who discovered gravity?
The scientist Isaac Newton.
True or false: magnetism is a contact force.
False!
Well done!
Describe a lever. In English!
A lever has two parts: a fulcrum and a rigid bar. You can place the load on one end and push on the other.
There's a big factory next to Caroline's house. It produces cars. The machines that make cars work all night, and it's hard for Caroline to sleep because she can hear them. What kind of pollution is this?
Noise pollution
Is gravity stronger on the Earth or on the Moon?
On the Moon.
When my friend throws me a basketball and I catch it, the ball:
a) stops moving
b) changes direction
c) starts moving
a) stops moving
Can using machines have negative effects? Why or why not?
Yes, it can because they can create many types of pollution.
Finish the sentence. A wheel is a circular object that turns around a central a _ _ _.
Axle
A company that makes chairs needs lots of wood. They take the wood from a forest, and there are no trees left. What is this called?
Deforestation!
Is gravity stronger on the Earth or on Jupiter?
On Jupiter.
If you apply a big force to a piece of paper, does it change shape or does it recover their original shape?
It changes shape.
Name three simple machines and three complex machines.
Simple machines:
pulley
wheel
inclined plane
lever
Complex machines:
cars
computers
phones
lightbulbs
etc.