1st Law Basics
This law says objects at rest stay at rest unless a force acts on them.
What is Newton's First Law of Motion?
This famous equation represents Newton's Second Law.
What is F=ma?
Newton's Third Law states that for every action, there is an equal and opposite this.
What is a reaction?
This safety device in cars uses Newton's First Law to protect passengers during sudden stops.
What are seatbelts?
This type of force causes objects to change their speed or direction.
What is an unbalanced force?
This property of matter explains why a heavy truck is harder to stop than a bicycle.
What is inertia?
If you increase the force on an object and keep mass the same, this happens to acceleration.
What is it increases?
When you push against a wall, the wall pushes back with this amount of force.
What is equal force (in the opposite direction)?
In amusement park rides, your body feels pushed outward during turns due to this law.
What is Newton's First Law (inertia)?
When forces are equal in magnitude but opposite in direction, they are called this type of forces.
What are balanced forces?
When you slide a book across a table and it eventually stops, this unbalanced force caused it to stop.
What is friction?
A 5 kg object has a net force of 20 N applied to it. This is its acceleration.
What is 4 m/s²?
A bird flies by pushing air downward, and air pushes the bird in this direction.
What is upward?
Rocket launches demonstrate Newton's Third Law by pushing hot gases in this direction to move upward.
What is downward (or opposite to the rocket's motion)?
A 30 N force to the right and a 10 N force to the left create this net force.
What is 20 N to the right?
A hockey puck gliding across smooth ice demonstrates this law because it keeps moving in a straight line.
What is Newton's First Law (or Law of Inertia)?
Two objects experience the same 100 N force. The 10 kg object will have this compared to the 5 kg object's acceleration.
What is half the acceleration (or 5 m/s² vs 10 m/s²)?
When Earth pulls you down with gravity, you pull Earth toward you with this type of force.
What is equal and opposite gravitational force?
An astronaut travels from Earth to the Moon. This stays the same while weight changes.
What is mass?
If an object speeds up, slows down, or changes direction, it is experiencing this.
What is acceleration?
In space, where there's no air resistance, a moving spacecraft will continue at constant velocity unless acted upon by this type of force.
What is an unbalanced (or net) force?
If you triple the force on an object while keeping mass constant, acceleration does this.
What is triples (or increases by 3)?
Action-reaction pairs don't cancel each other out because they act on these, preventing equilibrium.
What are different objects?
Earth's tectonic activities demonstrate all three laws simultaneously as plates experience unbalanced forces, accelerate according to their mass, and create equal and opposite forces at these.
What are plate boundaries (or fault lines)?
According to Newton's Second Law, if you double both the force and the mass of an object, acceleration does this.
What is stays the same (remains constant)?