When we say "25 miles per hour", we are describing this about an object's motion.
What is "its speed"?
100
According to Newton's 2nd law, this is what happens to the acceleration when the force is increased.
What is "acceleration increases"?
100
This is the term for the sum of all forces acting on an object.
What is "net force"?
100
When in free fall, this is true about the rate of acceleration of all objects.
What is "the rate of acceleration is the same".
200
Heavy things (with a lot of mass) have a lot of this.
What is "inertia"?
200
When we say "north" or "southeast", we are giving this.
What is "a direction"?
200
According to Newton's 2nd law, this is what happens to the acceleration when the mass is increased.
What is "acceleration decreases"?
200
There is no change in this when the net force is zero.
What is "motion"?
200
According to Newton's 3rd law, when I push against a wall, this is happening at the same time.
What is "the wall is pushing back against me"?
300
Inertia is the ability of an object to resist this.
What is "changes in motion"?
300
Velocity has these two parts, both of which describe an object's motion.
What are "speed and direction"?
300
Every force acting on every object has both a strength and this.
What is "a direction"?
300
In the experiment with the hair dryer and the ping pong ball, these were the two forces (and their directions) acting on the ping pong ball.
What are "the air pushing up and gravity pulling down"?
300
In the experiment with the balloon and the string, these were the two forces that made the balloon fly down the string.
What are "the balloon pushing against the air and the air pushing back on the balloon"?
400
This measurement tool can be used to measure an objects mass either in space or on earth.
What is "an inertial balance"?
400
This is the word that means an object's change in velocity.
What is "acceleration"?
400
According to Newton's 2nd law, this is what happens to the acceleration when the mass decreases.
What is "the acceleration increases"?
400
This happens when the only important force acting on an object is gravity.
What is "free fall"?
400
When a rocket launches into the air, these are the two forces that make it happen.
What are " the rocket pushing against the gases and the gases pushing against the rocket".
500
This is Newton's 1st Law.
What is "An object at rest tends to remain at rest unless acted on by an outside force, and an object in motion tends to remain in motion unless acted on by an outside force."
500
(True or false): Scientifically speaking, a car is accelerating when traveling at a constant speed through a curve in the road."
What is "True"?
500
This is Newton's 2nd Law.
What is "When a net force acts on an object, its acceleration increases with increasing force and decreases with increasing mass."
500
The strength of the force of gravity pulling on an object depends on this.
What is "the object's mass"?
500
This is Newton's 3rd Law.
What is "For every action there is an equal and opposite reaction."