physics concepts

if we know an object is moving at constant velocity, we may assume:

the net force acting on the object is zero

If there is a nonzero net force acting on an object, what must be true?

the object is being accelerated

What is conserved in an inelastic collision

momentum of the system

Which of the following quantites is equal to the impulse that acts on an object, assuming there is only one unbalanced force acting on the object?

F delta T

delta P

The unit of work, joule, is dimensionally the same as?

newton-meter

Conservative forces

gravity, elastic, electric

non conservative forces

friction, air resistance, tension, motor, push/pull

Which of the following is an example of inelastic collision

two cars crash head on and lock together, moving as one tangled mass after

When two objects collide and stick together, what happens to the total momentum and kinetic energy of the system?

Momentum is conserved, but kinetic energy is not

The rate at which work is done is equivalent to which of the following?

power

Consider an object that has work done on it by several non-conservative forces and a single conservative force. The work done by the conservative force is equal to:

Minus the change in potential energy of the object.

Select the correct statement about forces and motion:

If there is no net force acting on an object in motion, then the object remains in motion with constant speed along a straight-line path.

Box on incline + does not slide → friction = ?

mg sinθ

Box on incline + DOES slide → friction = 

ukN

Change in momentum is called what?

Impulse

Energy of motion is called what?

KE

Energy due to position or height is called what?

PE

Net work is equal to what?

Change in kinetic energy

If no kinetic energy is lost in a collision, what type is it? ::

 Elastic collision