Dynamics
This term describes the rate at which work is done or energy is transferred.
Power
What is the term for the rate of change of velocity?
Acceleration
Define momentum.
Momentum is the product of an object's mass and velocity.
What is the force called that acts on objects moving in a circular path and is directed towards the center of the circle?
Centripetal force.
This type of force occurs when surfaces slide against each other.
Friction
The energy possessed by a body due to its motion is called what?
Kinetic Energy
The path traveled by a projectile under the action of gravity only is called what?
Parabolic Trajectory
The product of the force applied to an object and the time during which it is applied is known as what?
Impulse
The type of velocity that is constant in magnitude but changing in direction for an object in circular motion is called what?
Tangential velocity.
The sum of all forces acting on an object is known as what?
Net Force
What is the unit of work in the International System of Units?
Joules (J)
This kinematic equation relates displacement, initial velocity, acceleration, and time without final velocity.
s=ut+1/2at^2 (where s = displacement, u = initial velocity, a = acceleration, t = time)
What is conserved in a collision when no external forces are acting?
Momentum
This law states that every mass attracts every other mass with a force directly proportional to the product of their masses.
Newton's Law of Universal Gravitation.
This force acts on all objects in motion through a fluid (air or liquid).
Drag Force
This type of potential energy is stored when an object is stretched or compressed.
Elastic potential energy
What is the slope of a velocity vs. time graph indicative of?
Acceleration
Calculate the impulse needed to stop a 1500 kg car moving at 20 m/s.
Impulse = change in momentum = m∗Δv=1500∗20=30000m∗Δv=1500∗20=30000 kg·m/s.
Calculate the centripetal acceleration of an object moving at a velocity of 10 m/s in a circle with a radius of 5 meters.
ac=v^2/r=10^2/5=20 m/s².
According to Newton's third law, for every action force there is a reaction force that is equal in size and what?
Opposite in direction
The Law of Conservation of Energy states that energy cannot be created or destroyed, but can be what?
Converted from one form to another
If a car accelerates uniformly from rest, calculate the distance covered in 3 seconds with an acceleration of 2 m/s².
s=21at^2, so distance s = 1/2∗2∗3^2=9 meters
How does increasing the time of impact during a collision affect the force experienced by the objects?
It decreases the force experienced by the objects.
What phenomenon do astronauts experience when they feel weightless in orbit?
Microgravity