# Physics homework

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I need some help. D: I don’t know what equations to use?

A 1450kg car accelerates uniformly from rest. It reaches 24 m/s in 9.2s. Calculate the force needed to cause this acceleration. [4]

A 1450kg car accelerates uniformly from rest. It reaches 24 m/s in 9.2s. Calculate the force needed to cause this acceleration. [4]

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#3

(Original post by

I need some help. D: I don’t know what equations to use?

A 1450kg car accelerates uniformly from rest. It reaches 24 m/s in 9.2s. Calculate the force needed to cause this acceleration. [4]

**polsan**)I need some help. D: I don’t know what equations to use?

A 1450kg car accelerates uniformly from rest. It reaches 24 m/s in 9.2s. Calculate the force needed to cause this acceleration. [4]

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thank you all! i was probably confused as i dont think i was taught the v = u + at before this homework which is weird, but thank you again!

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#5

First you want to use the SUVAT equation

You want to find a so you plug the values in

Since the car accelerates uniformly , and you are given the other values

After finding the acceleration using SUVAT, just use to find the force required.

You want to find a so you plug the values in

Since the car accelerates uniformly , and you are given the other values

After finding the acceleration using SUVAT, just use to find the force required.

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#6

(Original post by

Use SUVAT (v = u + at) to find the acceleration, then use F = ma with the acceleration you just worked out to find the force required.

**TheEpicToaster**)Use SUVAT (v = u + at) to find the acceleration, then use F = ma with the acceleration you just worked out to find the force required.

And shouldn't you use a = (v-u)/t

Then use F=ma to find out the force

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#7

I would assume you are in first year A-levels. You should take a quick look through the 4 (5 if you count the last one I mention) and try to memorise them ASAP and the derivations.

1) v = u + at

2) s = (u+v)/2 * t

3) s = ut + 1/2(at^2)

4) v^2 = u^2 + 2as

5) s = vt - 1/2(at^2)

I'd assume you know what all the symbols mean

1) v = u + at

2) s = (u+v)/2 * t

3) s = ut + 1/2(at^2)

4) v^2 = u^2 + 2as

5) s = vt - 1/2(at^2)

I'd assume you know what all the symbols mean

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#8

(Original post by

What is SUVAT?

And shouldn't you use a = (v-u)/t

Then use F=ma to find out the force

**_Mia101**)What is SUVAT?

And shouldn't you use a = (v-u)/t

Then use F=ma to find out the force

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#9

(Original post by

SUVAT is a commonly used term for the equations of motion. When you rearrange v = u + at, you get a = (v-u)/t, but since the car starts at rest, u = 0, so a = v/t.

**TheEpicToaster**)SUVAT is a commonly used term for the equations of motion. When you rearrange v = u + at, you get a = (v-u)/t, but since the car starts at rest, u = 0, so a = v/t.

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(Original post by

I would assume you are in first year A-levels. You should take a quick look through the 4 (5 if you count the last one I mention) and try to memorise them ASAP and the derivations.

1) v = u + at

2) s = (u+v)/2 * t

3) s = ut + 1/2(at^2)

4) v^2 = u^2 + 2as

5) s = vt - 1/2(at^2)

I'd assume you know what all the symbols mean

**Guarddyyy**)I would assume you are in first year A-levels. You should take a quick look through the 4 (5 if you count the last one I mention) and try to memorise them ASAP and the derivations.

1) v = u + at

2) s = (u+v)/2 * t

3) s = ut + 1/2(at^2)

4) v^2 = u^2 + 2as

5) s = vt - 1/2(at^2)

I'd assume you know what all the symbols mean

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#12

(Original post by

Surprisingly, I’m actually in year 11 lol

**polsan**)Surprisingly, I’m actually in year 11 lol

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#13

**_Mia101**)

What is SUVAT?

And shouldn't you use a = (v-u)/t

Then use F=ma to find out the force

u = initial velocity

v= final velocity

a = acceleration

t= time

There's a set of equations used when acceleration is constant ...(I started to learn in AS)

https://www.google.com/imgres?imgurl...act=mrc&uact=8

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I didn’t know about SUVAT but since it’s been explained it’ll be really useful for me, so thank you! I actually struggle with physics the most out of biology and chemistry, but I feel like it’s getting easier to handle... 🤔

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#15

(Original post by

s- displacement

u = initial velocity

v= final velocity

a = acceleration

t= time

There's a set of equations used when acceleration is constant ...(I started to learn in AS)

https://www.google.com/imgres?imgurl...act=mrc&uact=8

**Spannerin'moi**)s- displacement

u = initial velocity

v= final velocity

a = acceleration

t= time

There's a set of equations used when acceleration is constant ...(I started to learn in AS)

https://www.google.com/imgres?imgurl...act=mrc&uact=8

Would it be too early to start learning them in year 10?

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#17

If you plan to do physics, there's no harm in having a look in the future content. Getting your head around the basic principles is always the best, then you can do a range of questions.

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#18

(Original post by

From a Year 11, I definitely don’t remember this stuff, but if you really want to consolidate learning I think it’s useful to remember outside of your the topic you’re doing currently. I think it’s good practice to go over equations, especially for Physics

**polsan**)From a Year 11, I definitely don’t remember this stuff, but if you really want to consolidate learning I think it’s useful to remember outside of your the topic you’re doing currently. I think it’s good practice to go over equations, especially for Physics

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#19

I'd say its always better to familiarize yourself with it ...so it gets easier in Year 12^^

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#20

(Original post by

^^ No probs!

I'd say its always better to familiarize yourself with it ...so it gets easier in Year 12^^

**Spannerin'moi**)^^ No probs!

I'd say its always better to familiarize yourself with it ...so it gets easier in Year 12^^

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