Newton's Laws
This law states that an object at rest stays at rest and an object in motion stays in motion unless acted upon by an unbalanced force.
What is Newton's First Law of Motion?
Forces that are equal in strength and opposite in direction are called these.
What are balanced forces?
These forces can act at a distance, without objects touching, and may either attract or repel.
What are electric and magnetic forces?
Unlike electric and magnetic forces, this force always pulls objects toward one another.
What is gravitational force?
A hockey puck remains still until a player strikes it, and then it slides across the ice. This concept explains why its motion changed.
What is an unbalanced force?
This law explains why passengers move forward when a moving car stops suddenly.
What is Newton’s First Law of Motion, also called the law of inertia?
When the forces acting on an object are balanced, the net force is this.
What is zero?
Two like electric charges or two like magnetic poles exert this type of force on each other.
What is a repulsive force?
Gravitational force increases when the masses of the objects increase and decreases when the distance between them does this.
What is increases?
A loaded shopping cart requires more force than an empty cart to achieve the same acceleration. This relationship is described by this law.
What is Newton’s Second Law of Motion?
This law states that the acceleration of an object depends on its net force and mass.
What is Newton’s Second Law of Motion?
A box is pushed with a force of 20 newtons to the right and 8 newtons to the left. The net force is this.
What is 12 newtons to the right?
The electric force between charged objects becomes stronger when the amount of charge increases and the distance between the objects does this.
What is decreases?
This force keeps planets in orbit around the Sun and moons in orbit around planets.
What is gravity?
A charged balloon sticks to a wall without touching it first because an electric field causes forces to act between these.
What are objects that are not in contact?
A swimmer pushes water backward, and the water pushes the swimmer forward. This illustrates this law.
What is Newton’s Third Law of Motion?
A book rests motionless on a table because the upward normal force and downward gravitational force are these.
What are balanced forces?
This device uses a coil of current-carrying wire to create a magnetic field; adding more turns of wire or increasing the current makes it stronger.
What is an electromagnet?
Jupiter has a much greater mass than Earth. A spacecraft at the same distance from each planet's center would experience this difference in gravitational force.
What is a stronger gravitational force from Jupiter because greater mass produces stronger gravitational attraction?
A compass needle always points north because Earth acts like a giant version of this device, creating a field that exerts force on the magnetized needle without touching it.
What is a magnet (or magnetic field)?
A large truck and a small car experience the same net force. The vehicle with greater acceleration is this one.
What is the small car, because an object with less mass has greater acceleration when the force is the same?
A sled is pulled with 45 newtons to the east while friction pushes with 15 newtons to the west. The sled’s net force and motion are this.
What are a net force of 30 newtons east and acceleration toward the east?
Motors and generators use this connection between electricity and magnetism: magnetic forces can produce motion, and changing motion through a magnetic field can produce this.
What is an electric current?
Two objects are separated by the same distance. A massive planet and a small asteroid exert different gravitational forces on each other because the planet has this effect on the strength of the force.
What is a greater mass produces a stronger gravitational force?
A doorbell uses a coil of wire carrying current to attract an iron part and complete a circuit. The device demonstrates this concept and can be made stronger by adding more wire turns.
What is an electromagnet?