Astrophysics
This force keeps planets in orbit around stars and moons in orbit around planets.
What is gravity?
In physics, this is defined as force applied over a distance in the direction of motion.
What is work?
This is a push or pull on an object that can cause it to accelerate.
What is a force?
This branch of physics describes the motion of objects without considering the forces causing the motion.
What is kinematics?
This constant acceleration acts downward on all projectiles near Earth (ignoring air resistance).
What is -9.81 m/s²?
If a planet's orbital radius doubles, the gravitational force between it and its star changes by this factor.
What is one-fourth?
This quantity is defined as the rate at which work is done.
What is power?
This law states that an object at rest or in motion stays that way unless acted on by a net external force.
What is Newton’s First Law of Motion?
This quantity describes both magnitude and direction and is used to represent displacement, velocity, and acceleration.
What is a vector?
Projectile motion can be analyzed by separating it into these two independent types of motion.
What are horizontal and vertical motion?
A satellite remains in orbit around Earth because its forward velocity and Earth's gravitational pull combine to produce this type of acceleration.
What is centripetal acceleration?
The SI unit of work is the joule, while the SI unit of power is this.
What is the watt?
This type of energy depends on an object’s motion and increases with mass and velocity.
What is kinetic energy?
This quantity is defined as the rate of change of velocity with respect to time and is a vector that can point in the direction of motion or opposite it.
What is acceleration?
Ignoring air resistance, this quantity remains constant throughout the flight of a projectile.
What is horizontal velocity?
This law states that the square of a planet's orbital period is proportional to the cube of its average orbital radius.
What is Kepler's Third Law?
When a force acts perpendicular to an object's displacement, the work done by the force is this value.
What is zero?
This principle states that the total energy in a closed system remains constant, though it can change forms.
What is the law of conservation of energy?
This is the change in position of an object and is a vector quantity pointing from initial to final position.
What is displacement?
A projectile reaches its highest point. At that instant, what is true about its vertical motion, even though it is still moving forward?
What is its vertical velocity is zero?
This quantity can be calculated for a planet using the equation g= GM / r^2
What is the acceleration due to gravity?
This theorem states that the net work done on an object equals its change in kinetic energy.
What is the work-energy theorem?
This quantity is defined as the work done by a force over a distance and is equal to the change in an object’s kinetic and potential energy in a system.
What is mechanical energy?
This graphical tool shows how an object’s velocity changes over time, and the area under it represents displacement.
What is a velocity–time graph?
A projectile launched at an angle follows this type of path.
What is a parabola?