- #1

- 72

- 0

**
**

I've worked out (i), having problems with (ii). I know that the torque will be force x 0.75 but I haven't had any success in working out the force in the first place.

You are using an out of date browser. It may not display this or other websites correctly.

You should upgrade or use an alternative browser.

You should upgrade or use an alternative browser.

- Thread starter smr101
- Start date

- #1

- 72

- 0

I've worked out (i), having problems with (ii). I know that the torque will be force x 0.75 but I haven't had any success in working out the force in the first place.

- #2

Science Advisor

Homework Helper

Gold Member

- 5,492

- 1,592

What's the force required to accelerate the wagon if there's no incline?

- #3

- 72

- 0

What's the force required to accelerate the wagon if there's no incline?

Without an acceleration, I'm not sure.

- #4

Science Advisor

Homework Helper

Gold Member

- 5,492

- 1,592

From the problem statement, "... accelerate the wagon from rest to 2.6 m/s over a distance of 8.2 m at constant acceleration ..."Without an acceleration, I'm not sure.

- #5

- 72

- 0

From the problem statement, "... accelerate the wagon from rest to 2.6 m/s over a distance of 8.2 m at constant acceleration ..."

Right I've got the acceleration but I'm not getting the correct force. You're saying the force needed to work out the torque is when there is no incline?

- #6

Science Advisor

Homework Helper

Gold Member

- 5,492

- 1,592

No. You've got the force to do the acceleration? Can you calculate the force necessary to move the wagon up the incline? Add them.when there is no incline?

- #7

- 72

- 0

No. You've got the force to do the acceleration? Can you calculate the force necessary to move the wagon up the incline? Add them.

F = ma

= 1920 x 0.41

= 787.2

Fw = mgsinangle

= 1920 x 9.81 x sin10

= -10246.7

- #8

Science Advisor

Homework Helper

Gold Member

- 5,492

- 1,592

Don't just punch numbers into a calculator and blindly accept the number that comes out. What's the sin of 10°?= 1920 x 9.81 x sin10

= -10246.7

- #9

- 72

- 0

Don't just punch numbers into a calculator and blindly accept the number that comes out. What's the sin of 10°?

Ah, I was in radians...

Fw = mgsinangle

= 3270.7

- #10

Science Advisor

Homework Helper

Gold Member

- 5,492

- 1,592

Better.

- #11

- 72

- 0

Better.

Then just add the Ff to that and the Fu I've got it... Thanks, I've made that much more difficult than it should have been!

- #12

- 72

- 0

Share:

- Replies
- 7

- Views
- 597

- Replies
- 7

- Views
- 678

- Replies
- 3

- Views
- 658

- Replies
- 3

- Views
- 324

- Replies
- 6

- Views
- 219

- Replies
- 1

- Views
- 670

- Replies
- 40

- Views
- 1K

- Replies
- 9

- Views
- 586

- Replies
- 5

- Views
- 666

- Replies
- 2

- Views
- 542