# Homework Help: Block on frictionless floor

1. Sep 11, 2008

### BrettL789123

Block on frictionless floor!!!!

A 3.70 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=13.0 N at an angle q= 25.0° above the horizontal, as shown.

What is the speed of the block 3.70 seconds after it starts moving?

I have drawn a picture but have no idea what equation to start with. know you solve for aceeleration, then once you have accel. you just solve for Vfinal

Last edited: Sep 11, 2008
2. Sep 11, 2008

### edziura

Re: Block on frictionless floor!!!!

This involves force, mass and a change in speed. What principle of law relates these physcial concepts?

3. Sep 11, 2008

### BrettL789123

Re: Block on frictionless floor!!!!

Newtons 2nd law

4. Sep 11, 2008

### BrettL789123

Re: Block on frictionless floor!!!!

so what now? i know the equations but dont konw how to get acceleration cuase of the theta stuff

5. Sep 11, 2008

### edziura

Re: Block on frictionless floor!!!!

Assuming the vertical component is not sufficient to lift the block off the floor, use the 2nd law with the horizontal component of the applied force.