Ask Experts Questions for FREE Help !
Ask
    western50's Avatar
    western50 Posts: 105, Reputation: 1
    Junior Member
     
    #1

    Nov 17, 2010, 08:21 PM
    newtons' laws
    A block of mass m1 (labeled by U) is placed on top of a larger block of mass m2 (labeled by L). A man is trying to pull the blocks to the right via a spring (labeled by S) attached to the large block, but the blocks do not move. The friction force between the large block and the ground is FL,G. What is the magnitude of the friction force between the large and small block?



    0
    (m1/m2)FL,G
    (m1/(m1 + m2))FL,G how to start?



    A truck of mass M is moving with a constant acceleration a up a hill that is inclined at an angle α with respect to the horizontal.



    In case I, the truck carries a box of mass m and in Case II, the mass of the box is 2m. In both cases the coefficient of static friction between the box and the bed of the truck is μS. Compare aI, the maximum acceleration the truck can have before the box slips in Case I, to aII, the maximum acceleration the truck can have before the box slips in Case II.
    aI < aII
    aI = aII
    aI > aII again, how can I start?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
    Uber Member
     
    #2

    Nov 18, 2010, 06:54 AM
    1. I'm assuming that the coefficient of static friction is the same between the blocks and the ground.

    The friction on between the large block and the ground is given by:



    Find R

    What is the equation for the frictional force between the small block and the large block?

    You'll need the normal force on the small block.

    Substitute the coefficient of friction now, from the first equation into the second equation.

    2. Find the maximum frictional force that can act on the box, that is when the frictional force is equal in magnitude to the component of gravity of the box.

    The one which can produce a greater frictional force can be accelerated to a greater extend by the truck.

Not your question? Ask your question View similar questions

 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Newtons' laws [ 1 Answers ]

Two identical blocks, A and B, of mass M, are stacked in an elevator as shown to the right. The elevator accelerates upwards with acceleration a . What is the magnitude of the force that block A exerts on block B? M (g+a) M (g-a) 2 M (g+a) ...

Newtons' laws [ 3 Answers ]

Block A (mass = MA) is stacked on top of Block B (mass = MB) in an elevator that is accelerating upwards with acceleration a as shown below. The next two questions pertain to this situation. The symbol g has the value +9.8 m/s2. ...

Newtons 3 laws of motion [ 4 Answers ]

this is my problem... I am a special education teacher for a high school.. my kids are about on a 7-9 th grade.. For when we come back from x-mas break I would love to do Newtons 3 laws of motion... On one of the kids IEP's it states when there is a force there is an equal and opposite force...

Acceleration and Newtons laws [ 1 Answers ]

A 1.1 *10^3 Kg car accelerates at 3.40m/s^2 . If the wheel exerts a force of 5.6*10^3N on the road, calculate the force resisting the motion?

Newtons second and third laws [ 1 Answers ]

An athlete lifts a mass of 157.5 kg. his own mass was only 54.0kg. Calculate the force acting on each of his feet at the moment he was lifting the mass with an upward acceleration of 1.00m/s squared assume that the downward force on each foot is the same.


View more questions Search