Newton's Laws of Motion
What kind of force keeps your rubber ducky floating?
Buoyant force.
How can I calculate pressure?
P=F/A. Pressure is calculated using the equation, “pressure equals force divided by area.”
If a 2500-kilogram car accelerates at a rate of 4 meters per second squared, what is the force the engine applied to the car? (Don't forget the units) Show me your equation with units.
hint: 1 newton = 1 kg(m/s^2)
2500 kg * 4 m/s^2 = 10,000 kg(m/s^2)
or 10,000 newtons
Are we always surrounded by fluid? Tell me something about the molecules of a fluid.
Yes, we are surrounded by air, which is a fluid (and a gas). The molecules of a fluid "flow".
What are Newton's 3 Laws of Motion?
1. A body at rest will stay at rest, and a body in motion will remain in motion unless acted on by an external force.
2. Force = Mass * Acceleration
3. For every action, there is an equal and opposite reaction.
The Hulk is pushing against Thanos at a force of 4.5 million newtons. Thanos pushes back with 5 million newtons. Is this a balanced or unbalanced force? What's the net force?
Unbalanced! The net force is 500,000 newtons. Sorry, Avengers!
What is inertia? Which of Newton's Laws does it apply to?
Inertia is the tendency to stay at rest or in motion. It relates to Law number 1.
Does the earth move some when I jump? Why doesn't it seem to? Refer to two of Newton's Laws.
Newton's 3rd Law. Yes, the earth does experience an equal and opposite reaction to your jump, so it moves a negligible amount.
Newton's 2nd Law. F = ma. Your mass and acceleration are so tiny that your force is almost nothing against the mass of the earth.
Use Pascal's Principle to describe what happens when I squeeze a full 2-liter bottle of melted butter.
The pressure is distributed evenly throughout the bottle. If the cap was off, though, you should spray liquid butter everywhere. Gross.
Steve and Jeff are driving to the airport, late for their flight. They hop into their parked car and take off! They take 2 left turns, a right turn, speed up through a red light, and take another right, and stop in front of the airport. They maintain 70 miles per hour at all times except for passing through the red light and at the beginning and end. How many times did they change velocity? How many times did they accelerate?
Draw a chart to help!
They changed velocity 8 times! They accelerated 8 times!
If a bee is flying in a circle at a constant speed, is the bee accelerating? What special force is the bee experiencing? What's the opposite of that force?
Yes. Centrifugal. Centripetal.