# physics

find the average of a block being propelled propelled by an elastic band.

very sorry to disturb Mr bobpurlsey again. i am very thankful to you replies. the only problem that lies in the answer is that i haven't been taught hooke's law in Grade 11. which indicates 1/2kx^2 i looked this up in wikipedia but did not learn this in grade 11. is there any other way to attempt this question sir? i know the force applied in the elastic band is not constant because it changes as the elastic destreches. just to let you u know i get an extra wooden block with a small edge on it to hook the elastic and propell the other block. sir is there any other way i can understand this. links?
thank you very very much for all your help

This is very odd that you haven't had Hookes'Law. Normally, that is in about 8th grade science. Anyway, it explains the force not being constant on the rubber as expansion changes (force=kx).

No, I don't think you will be able to do it any other way, Unless you have an electronic doppler velocity detector to detect how fast the block is going at release.

I am really wondering if you are certain in your mind what you are doing. The sentence starting this out says "find the average of a block being propelled by an elastic band". Hmmm. Average what? I thought you were looking for the force of friction after it was released and was sliding.

You can learn about Hookes law by reading it yourself. Rubber bands are not truly elastic, but they are close.

yes i am trying to average find force of friction.

well, all I can say is that the average force of friction does not depend on the rubber band. What you are doing is measuring the friction by how far the block slides, and that depends on the rubber band. Reread my posts on this.

1. 👍 0
2. 👎 0
3. 👁 107

## Similar Questions

1. ### physics

find the average of a block being propelled propelled by an elastic band. We know it is uniform acceleration. my attempt on this problem Measure the force applied of elastic band with a newton scale. The more you strecth the

asked by james on June 12, 2007
2. ### science ( physics)

hello, i am having trouble with this problem. Calculate the average force of friction acting on a wood block as it is propelled along the floor by an elastic band ? my solution and my ideas: What does it mean by average froce of

asked by charlie on May 30, 2007
3. ### physics

hello, i have this question. Calculate the average force of friction acting on a wooden block as it propelled along the floor? i have done the following solution first of all i don't know what average force of friction means? i

asked by daniel on June 5, 2007
4. ### English

Write the complete verb in each sentence. Label it active or passive. 1. It was propelled by six paddles on each side. Each side was propelled by six paddles. Passive?

asked by Emma on October 25, 2012
5. ### physics

Identify the force that propels a rocket. 1)The rocket is propelled by the reaction force of the exhaust gasses bouncing off the air molecules outside the rocket. 2)The rocket is propelled because the action force of the rocket on

asked by dave on October 18, 2016
6. ### physics

Identify the force that propels a rocket. 1)The rocket is propelled by the reaction force of the exhaust gasses bouncing off the air molecules outside the rocket. 2)The rocket is propelled because the action force of the rocket on

asked by dave on October 18, 2016
7. ### physics

A 6.2 g piece of clay is propelled horizontally onto a block of wood with a mass of 18.4 g. The wood block is initially at rest on a 1.75 m tall post. After the collision the wood block will land 2.2 m from the base of the post.

asked by Greyson on January 24, 2013
8. ### Physics

A projectile is propelled along the x-axis. During 5.2 s it moves from position 64 m to position −40 m. Find its average velocity.

asked by Alice on November 1, 2017
9. ### Science (Balanced/Unbalanced Forces)

"Toy Car A" is propelled by elastic force. The other forces acting on the car are gravity (pulling the car down) and friction force (between the car and the floor). What UNBALANCED forces are acting on the car? "Toy Car B" is

asked by Alexandra on December 19, 2013