Newton's 3 Laws
Name one of Newton's 3 laws.
1st - An object at rest tends to stay at rest, and an object in motion tends to stay in morion unless acted upon by an outside force.
2nd - force = mass x acceleration
3rd - For every action, there is an equal and opposite reaction.
What is a force?
a push or a pull
What do engineers do to a rocket to decrease drag?
nosecone, smooth streamlined shape
Air moving faster exerts lower or higher pressure
less/ lower
When playing tug of war, which of Newton's laws did this demonstrate?
newtons 3rd law
According to newtonʼs 1st law, objects tend to keep doing what they are doing. Why did the water rockets not keep going up?
An outside force(s) was acting on them - gravity, drag
What force pulls objects towards the earth?
gravity
As discussed in class, the value of what force is so exactly set that it points to a creator?
gravity
What is stored energy called?
Potential energy
When doing an experiment, you change only one thing at a time. What is the name of this kind of variable?
what is independent variable
Name all 3 of Newton's 3 laws of motion.
1st - An object at rest tends to stay at rest, and an object in motion tends to stay in morion unless acted upon by an outside force.
2nd - force = mass x acceleration
3rd - For every action, there is an equal and opposite reaction.
What force stops a rolling ball?
friction
What force causes a rocket to launch?
thrust
When holding a ping pong ball over the blow dryer, what did the air do to the ping pong ball?
the ball hovers because the air above the ball was moving fast and had lower pressure than the air underneath the ball
When doing the wind tunnel, what design/shape helped to create the fastest spinning objects
accept several answers: pinwheel shape, fins or blades, helicopter
Using Newton's law of motion, explain why seat belts are so important in a car accident
the motion would push a person forward after a sudden stop, but the sealt belt will hold a person in place
What is the name for friction caused by air?
drag
True or false, if you apply a larger force to an object, it will result in a larger acceleration?
true
What is the law of conservation of energy?
Energy cannot be created or destroyed it can be transformed or transferred to other things.
Explain how we saw Newton's Second Law of motion in action with our marshmallow gun experiment? Think F=ma
The bigger the breath of air that is used, the further the marshmallow will go.
If you apply equal net forces to two objects with different masses, which one will accelerate more?
the one with greater/ more mass
What force helps a plane stay up in the air?
lift
Name the 3 main forces on a rocket.
thrust, gravity, drag
explain the difference between potential and kinetic energy (or give examples of each)
potential energy- stored up, but not moving yet
ex/ battery
kinetic- movement, ex/ kicking a ball
Why did the potato cannon have a larger diameter tube at the ignition end and a smaller diameter tube at the exit?
Think of water coming out of a hose. If I squeeze the hose, does the water come out more slowly or more quickly? More quickly. This is because the amount of water coming through that section of the hose does not change when the hose gets smaller, so the water has to go faster to make it out. Air goes in the large area of the adapter and then has to move more quickly when it hits the smaller tube.