This term describes the linear speed of an object moving in a circle.
Tangential speed.
This term refers to the product of a force and the distance it is exerted over.
What is work.
I push a 30 kg object along a rough floor with a net force of 120 N. I stop pushing after 4 seconds. How far is the object from its starting point after 4 seconds?
32 m.
True or false: Two objects spinning on the same disk can have different rotational speeds if one is further from the center than the other.
False, they have different tangential speeds.
This term refers to the energy of moving objects.
What is kinetic energy.
A ball with mass 50 kg and velocity 10 m/s collides with another ball with mass 20 kg at rest, and gives that ball all of its momentum. They collide elastically, bouncing and losing no energy in the process. What is the new velocity of the 20 kg ball?
What is 25 m/s
This term describes an object's resistance to changes in its rotational motion.
Rotational inertia.
A 100 kg object hits a wall at 40 m/s, loses all of its momentum, and drops to the ground. The whole collision took 0.1 seconds. What was the force on the object?
What is 40,000 N.
An object thrown through the air might look like it is tumbling chaotically, but its _________ of _______ is still travelling in a smooth arc.
Center of mass.
What is a black hole.
An object with mass 12 kg is lifted off the ground 20 m. What is its velocity when it hits the ground?
20 m/s
The force that causes an object to move in a circle is called a _______ force.
What is a centripetal force.
Two objects are floating in open space, exerting gravity on each other. The distance between the two objects is increased by 8 times, but the mass of each object is doubled. By how much has the force of gravity been increased/decreased?
It is equal to 1/16 of the original force.
A spring is compressed 2 meters from its equilibrium position. A 5 kg stone is loaded onto the spring. When the spring is released, the stone is accelerated to a speed of 20 m/s. What is the spring constant of the spring?
K = 500 N/m