Resultant Forces | GCSE Physics | Doodle Science

Doodle Science teaches you high school physics in a less boring way in almost no time!

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An object may have several different forces acting on it, which can have different strengths and directions. But they can be added together to give the resultant force. This is a single force that has the same effect on the object as all the individual forces acting together.

For example a rocket travelling into space with a thrust of 1000N and a weight of 200N will begin to accelerate because the resultant force is 800N.

When all forces are balanced, the resultant force is zero. In this case: A stationary object remains stationary and a moving object keeps on moving at the same speed and in the same direction.

For example, in a tug-of-war competition, the resultant force when in a stalemate is zero, because both teams are pulling on the rope with equal force. In this case the result is stationary. However, when a skydiver jumps out of a plane, his weight is greater than the air resistance at first and he starts to accelerate. He then reaches a point where his weight and air resistance balance out, this is called terminal velocity and the resultant force is zero, but don't worry, he's not stationary of course, he's just plummeting to the ground at a constant speed that's all.

[touba]

1 min of this guy is better than any physics teacher I've ever had😂

[jaderobin]

"just plummeting to the ground at a constant speed, that's all"
freaking legend

[GNAMFMAN]

Nice! Exactly what I need for my class. :D

[shurdi]

...Your car wheels are going backwards

[G_Aryyy]

"Don't worry he's not stationary ofc, he's just plummeting to the ground at a constant speed, that's all"
is one of the craziest thing i've ever heard 💀💀💀

[russellgoodwin]

As Dave Evans just pointed out, there is a problem with the animation of the skydiver! Weight doesn't change just because you are falling. Otherwise, excellent, this is great for my students.

[dave]

I like your videos but I have a small problem with this one. When you are describing the forces acting on a skydiver your animation suggests that his weight gets smaller.

[blackberrykathryn]

Very useful, thank you
So the resultant force is the overall force acting upon an object

[mickwolbers]

The air resistance is getting greater while accelerating, but the gravitational force stays the same therefore you are wrong by making the arrow downwards longer.

[Soldier]

There are some animation errors here that don't help the physics. At 0:45 the arrow pointing down shouldn't become smaller, the arrow pointing up should become bigger. At 0:20 the arrows aren't drawn to scale. (minor: at 0:33 the wheels are turning in the wrong direction).

Now I can't use this, as a physics teacher...

[malachylewin]

I was stuck on a science question to do with this for *HOURS* and then I watched this, and answered it emidiately. THanks!!!! :D: D: D: :D:D::D:D::D:D:DDD::D:

[bluethunder]

your Chanel really help O/L kids like me. thanx sir👍👍👍👌😘

[Froget_]

If one is standing on a moving platform
throwing balls to the opposite way of the movement of the car
it removes from its speed, but if one throws balls WITH the movement of the car
the balls are accelerated right?
i know this seems obvious but it bugs me allot

[tusharramdin]

why does an object not move in the direction of resultant force while decelerating

[josephkemp]

FYI: The weight force doesn't change during free fall (without the person loosing mass). Terminal velocity is reached when the drag force increases. Check time 0.54m, it's wrong. ;)

[lcchen]

Can any one answer my question:why did some question don't subtract the weight of an object(when calculating resultant force?).

[TheTopDog]

you should start uploading again your views will soar because of this virus and home schooling going on

[imbiork]

Isn't the resistant force called Drag ?

[naack]

the wheels on the car were rotating backwards. 
haha

[barlasulucay]

Hi sir, How do you calculate the resulant force?