Unit 1
What is Acceleration due to gravity?
9.81m/s
What is friction?
A contact force that will always oppose motion.
Can energy be created or destroyed?
No
What is Impulse equal to?
Momentum.
What is Torque?
Rotational force.
What is the equation for force?
f=ma
Does static friction equal kinetic friction on an object?
No, Static friction applies a greater force on an object than kinetic friction.
What can make up mechanical energy of a system?
Kinetic, potential and thermal energies
What is impulse
Force acting on an object for a give amount of time.
Is a centrifugal force a real force?
Nope
What is the difference between velocity and speed?
Velocity is a vector, while speed is scalar.
What is a free body diagram?
A graphical representation of all forces acting on an object.
What is the difference between an open and closed system?
Closed has no outside forces acting on a system, while an open one does.
What is the formula for momentum?
p = mv
What is the equation to convert angular velocity to linear velocity?
v=wr
Is normal force always equal to the force of gravity, explain why or why not.
Nope, The force of friction exists. Friction can increase the normal force of an object.
If there are four forces acting on an object, the left and right forces are equal, but are larger than the up and down forces, which are also equal, which direction is the object moving?
None
What is work?
How much energy is used by a force over a certain displacement
In a velocity V time graph, how could you find the greatest impulse on a system?
Look for the greatest change in velocity on the graph.
Does rotational inertia vary from object to object?
Yes
A position V Time graph has a constant slope that starts out at 0, ends at (18,9). What is the slope of the graph, and what is the the acceleration of the system?
y=2x, 0
What are Newton's Three Laws of motion?
1. An object will remain at rest/remain in motion unless another force acts upon it.
2. Acceleration of an object depends on it's mass and force acting upon it.
3. Every action has it's equal opposite reaction
Suppose two people, one being 50g, and the other being 80kg, travel with same amount of force, to the same point along a road. Judge whether or not they did the same amount of work and why.
They did the same amount of work, as mass does not affect work done.
What is the difference between a Elastic and inelastic collision and how does it affect momentum?
Elastic perfectly rebounds two objects, preserving momentum, while inelastic does not.
Using a graph, how can you calculate change in rotational momentum?