Force
What is the force that opposes the motion of objects through the air?
Air resistance
What is the energy called that is stored in an object's position or condition?
Potential energy
Velocity is described as an object's speed and what?
Direction
What unit is used to measure force in the International System of Units (SI)?
The Newton (N)
Momentum is the product of an object's mass and what other quantity?
Velocity
What type of force is exerted without physical contact?
A non-contact force (like gravity or magnetic force)
Name the energy of moving objects.
Kinetic Energy
If a car travels north 60 km in 2 hours, what is its velocity?
30 km/h north or 8.33 m/s
What is the SI unit for energy?
The Joule (J)
What principle states that the total momentum of a closed system remains constant if no external forces act on it?
The conservation of momentum
In Newton's second law, force is equal to mass times what?
Acceleration
What principle states that energy cannot be created or destroyed, only transformed?
Conservation of energy
How do you calculate the average velocity of an object?
Total displacement divided by total time
or
change in displacement over change in time
In SI units, what is the unit of velocity?
meters per second (m/s)
What happens to the momentum of an object if its mass doubles while its velocity stays the same?
The momentum doubles
Name the force that acts between all objects with mass and pulls them towards each other.
Gravity
If you increase an object's height, what happens to the magnitude of the potential energy?
It increases. GPE = mgh
What happens to velocity if an object accelerates in the direction opposite to its motion?
The velocity decreases until 0, then increases in the negative direction.
What unit is used to measure work?
The Joule (J)
What is the total momentum after a collision equal to?
The total momentum before the collision.
What is the net force acting on an object moving at a constant velocity of 5 m/s?
There is zero net force. Constant velocity means no acceleration, which means no force.
When an object is falling from some height, what is happening to the kinetic energy before it hits the ground?
It is increasing
How is instantaneous velocity different from average velocity?
Instantaneous velocity is the speed at a specific moment, while average velocity is over a period of time
Name the SI unit for momentum.
kilogram meters per second (kg m/s)
or
Newton seconds (Ns)
Change in momentum is equal to what?
Impulse