Linear Momentum & Impulse
What type of collision occurs when two objects join together after colliding?
What is velocity?
Change in displacement over time
What is Newton's 2nd Law?
F=ma
Which has more mass, the Earth or the Moon?
The Earth
In the work equation W=Fdcos(theta), what does theta represent?
The angle between F and d
In what type of collision(s) is kinetic energy conserved?
Elastic collisions
0 m/s
What is another name for gravitational force (mg)?
Weight
What do you multiply by to go from revolutions to meters?
2(pi)r
What is the work-energy theorem?
W=(delta)KE
In which type of collision(s) is linear momentum conserved?
All
What is acceleration?
Change in velocity over time
Which coefficient of friction is typically higher, static or kinetic?
Static
For a car driving on a flat curve, what force provides all of the centripetal force?
Friction
When is mechanical energy conserved?
If a larger object collides with a smaller object and sticks, which object experiences a larger magnitude of momentum change?
They experience the same magnitude of momentum change.
For an object moving to the left (in the negative direction) and slowing down, what is the direction of the acceleration?
To the right (positive direction)
This force is always perpendicular to the surface an object is moving/resting on.
Normal Force
If you double the speed of an object while keeping the radius constant, how does that affect the centripetal acceleration?
Centripetal acceleration increases by a factor of 4
What makes a force nonconservative?
The work done by the force is dependent on the path taken. (for example, there is more work done by friction if you take a longer path from one point to another)
A train car is moving on a track at a constant speed. A large load of coal is dropped into the train car. What happens to the velocity of the train car?
Starting on level ground, what angle should a projectile be launched at to have the greatest displacement?
45˚
Fgy=mgcos(theta)
What is the mass of the Sun?
1.99 x 1030 kg
An object with a non-zero kinetic energy must be...
moving