Force and Motion
What is a force?
A push or pull on an object.
Newton’s First Law is...
An object in motion stays in motion unless acted upon by another force.
What force pushes against objects moving through the air?
Air resistance.
Who discovered the laws of motion and gravity?
Isaac Newton.
What do opposite poles of a magnet do?
Attract
If an object speeds up, slows down, or changes direction, what is changing?
The velocity.
Newton's Second Law...
F=MxA
True or False: Air resistance always acts in the same direction as motion.
False (it acts opposite to motion).
Who first proposed the heliocentric (sun-centered) model?
Copernicus
What do like poles of a magnet do?
Repel
A box is being pushed to the left with 10N, someone comes and pushes it the same direction with 5N, what total amount of Newtons and which direction?
15N, left
Newton's Third Law...
For every action there is an equal and opposite reaction.
Why do parachutes slow a person’s fall?
They increase air resistance.
Galileo used what tool to study the stars and support the heliocentric theory?
The telescope.
What invisible area around a magnet pushes or pulls objects?
Magnetic field.
What is the formula for acceleration?
A=vf-vi/t
Why do you keep moving despite the car slamming the brakes?
Inertia.
A feather and a hammer are dropped on Earth. Why does the feather fall slower?
Because of air resistance.
What was the main method developed during the Scientific Revolution to study the world?
The scientific method.
Earth acts like a giant ___?
Magnet
A spacecraft is landing on a planet. Its initial velocity as it enters the planet’s atmosphere is 2,400 m/s, and it needs to slow down to 0 m/s to land safely. If it takes 5 minutes to stop, and the spacecraft has a mass of 400 kg. What is the acceleration?
a=−8
Give an example of Newton’s Third Law in everyday life.
Answer varies.
On the Moon, there is no air. What happens if you drop a hammer and feather there?
They fall at the same rate.
Why was the Scientific Revolution important for the modern world?
It encouraged observation, evidence, and new discoveries that shaped science today.
Why do compasses point north?
They align with Earth’s magnetic field.