First Law Frenzy
This is the name for an object’s tendency to resist changes in its motion.
What is inertia?
Newton’s Second Law connects these three physical quantities.
What are force, mass, and acceleration?
Newton’s Third Law states that every action force has an equal and this type of reaction force.
What is opposite?
A 4 kg object accelerates at 3 m/s². This is the net force acting on the object.
What is 12 N?
A soccer ball remains motionless on the grass until a player kicks it. This law explains why the ball stays at rest until an unbalanced force acts.
What is Newton’s First Law?
According to Newton’s First Law, an object at rest will remain at rest unless this type of force acts on it.
What is an unbalanced force?
When the net force acting on an object increases while its mass remains constant, this happens to its acceleration.
What is an increase?
A swimmer pushes water backward. This is the reaction force.
What is the water pushing the swimmer forward?
An object experiences a net force of 40 N and accelerates at 5 m/s². This is the object’s mass.
What is 8 kg?
A student pushes an empty shopping cart and a full shopping cart with the same net force. The empty cart accelerates faster. This law explains why
What is Newton’s Second Law?
A passenger continues moving forward when a car suddenly stops because of this property of matter.
What is inertia?
Two objects experience the same net force. Object A has a mass of 5 kg, while Object B has a mass of 15 kg. This object experiences greater acceleration.
What is Object A?
A student pushes against a wall with 45 N of force. This is the force the wall exerts back on the student.
What is 45 N in the opposite direction?
A 6 kg object experiences a net force of 72 N. This is its acceleration.
What is 12 m/s²?
A rocket pushes exhaust gases downward, and the gases push the rocket upward. This law explains the interaction.
What is Newton’s Third Law?
Two students push a box in opposite directions with equal forces of 25 N. This is the net force acting on the box.
What is 0 N?
A student doubles the mass of an object while keeping the net force constant. This happens to its acceleration.
What is decreasing to half its original value?
Action-reaction forces do not cancel each other out because they act on these.
What are different objects?
A 15 kg object accelerates at 8 m/s². This is the net force acting on the object.
What is 120 N?
When a student jumps, their feet push down on the ground, and the ground pushes upward on their feet. This law explains these forces.
What is Newton’s Third Law?
A hockey puck slides across perfectly frictionless ice. If no net force acts on it, this describes what happens to its velocity.
What is remaining constant in both speed and direction?
Two shopping carts have identical masses. Cart A experiences a net force of 20 N, while Cart B experiences a net force of 60 N. Compared with Cart A, this is how much greater Cart B’s acceleration is.
What is three times as great?
A small car and a large truck collide. Although the truck has much more mass, this describes the forces they exert on each other during the collision.
What are equal-magnitude forces acting in opposite directions?
A 10 kg cart accelerates at 4 m/s². Its mass is then doubled while the net force remains constant. This is the cart’s new acceleration.
What is 2 m/s²?
A small car and a large truck collide. They exert equal and opposite forces on each other, but the smaller car experiences greater acceleration because it has less mass. These TWO laws explain the situation.
What are Newton’s Second and Third Laws?
Two students wearing roller skates push against each other.
Student A has a mass of 40 kg, and Student B has a mass of 80 kg.
During the push, each student experiences a force of 160 N in opposite directions.
Using Newton’s Second and Third Laws, determine the acceleration of BOTH students and explain why their accelerations are different
What are 4 m/s² for Student A and 2 m/s² for Student B, in opposite directions?
Explanation:
Student A:
a = F ÷ m
a = 160 ÷ 40
a = 4 m/s²
Student B:
a = F ÷ m
a = 160 ÷ 80
a = 2 m/s²
Newton’s Third Law explains why the students exert equal and opposite forces.
Newton’s Second Law explains why the student with less mass experiences greater acceleration.