physics help please ..

[moto_za]

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thanks a lot ,

1)The word 'push' is reasonably good synonym for the word FORCE.
Is 'hold' a synonym for force?
How about 'support'?
How many others can you think of?

2)A car is slowing down while it negotiates a curve on a flat road. The net acceleration of the car is

zero.

directed toward the center of curvature of the curve

directed along the tangent to the curve.

none of the above.

 

[Doctor of Genes]

thanks a lot ,

1)The word 'push' is reasonably good synonym for the word FORCE.
Is 'hold' a synonym for force?
How about 'support'?
How many others can you think of?

2)A car is slowing down while it negotiates a curve on a flat road. The net acceleration of the car is

zero.

directed toward the center of curvature of the curve

directed along the tangent to the curve.

none of the above.

this is not a homework forum!

 

[xylem29]

thanks a lot ,

1)The word 'push' is reasonably good synonym for the word FORCE.
Is 'hold' a synonym for force?
How about 'support'?
How many others can you think of?

2)A car is slowing down while it negotiates a curve on a flat road. The net acceleration of the car is

zero.

directed toward the center of curvature of the curve

directed along the tangent to the curve.

none of the above.

Well, first off for 2), if it is slowing down, then it's speed is changing. Which means it's velocity is changing -> there has to be an acceleration. Even if the car is not slowing down, but travels around a curve, it's direction changes, and so therefore it's velocity changes too. It experiences an acceleration toward the centre for the change in direction, and a tangential acceleration for the change in speed. Therefore the answer is both of the bolded statements.

Yes, support or hold can be forces - the normal force is a support force.

 

[novawildcat]

this is not a homework forum!

LOL hw questions always get answered here because premeds always feel the need to show off how smart they are. 😀

 

[da8s0859q]

this is not a homework forum!

Then you can safely disregard questions like this and post in other threads. Move along, nothing to see here.

OP - I'm extraordinarily rusty on my physics, having not seen it since AP phys in high school (and taking it late in undergrad), so I'll have to defer to some of the more up-to-speed physics folks here.

 

[deleted103644]

Well, first off for 2), if it is slowing down, then it's speed is changing. Which means it's velocity is changing -> there has to be an acceleration. Even if the car is not slowing down, but travels around a curve, it's direction changes, and so therefore it's velocity changes too. It experiences an acceleration toward the centre for the change in direction, and a tangential acceleration for the change in speed. Therefore the answer is both of the bolded statements.

Yes, support or hold can be forces - the normal force is a support force.

It asks for net acceleration, so you're right there are components in both directions, but the right answer is none of the above, since acceleration is pointing in between those two answers.

 

[DrShambach]

What's interesting is that most people on SDN generally get really heated at the thought that some of the competition has cheated on their undergrad coursework. But we answer homework questions on SDN. 😕 Serious suggestion for the OP, if you don't understand the concepts you might wanna find a tutor. Physics is one of those subjects where knowing the answers is only half the battle (if that much).