# A 7 kg. mass is moved across table at 25 m/sec. What force caused the acceleration?

A push or a pull

An object can only accelerate when it is subject to a net force.

When an object is moving at a constant speed without experiencing any acceleration, it is not subject to any net force.

A net force is the result of all the forces acting on an object having to cancel out in a diagram.

If you sketch a diagram of all the forces acting on an object, and one of those forces is greater than the other, you have net force, which results in acceleration.

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Force caused the acceleration, and it can be calculated using Newton's second law, which is expressed as Force (F) = mass (m) * acceleration (a). In this case, force is needed to overcome inertia and accelerate the mass.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

- An object, previously at rest, slides #8 m# down a ramp, with an incline of #π/6 #, and then slides horizontally on the floor for another #5 m#. If the ramp and floor are made of the same material, what is the material's kinetic friction coefficient?
- An object with a mass of #4 kg# is hanging from a spring with a constant of #3 (kg)/s^2#. If the spring is stretched by # 10 m#, what is the net force on the object?
- A truck pulls boxes up an incline plane. The truck can exert a maximum force of #3,200 N#. If the plane's incline is #(5 pi )/8 # and the coefficient of friction is #3/7 #, what is the maximum mass that can be pulled up at one time?
- If an object is moving at #7# #ms^-1# over a surface with a kinetic friction coefficient of #u_k=2/g#, how far will the object continue to move?
- An object with a mass of #7 kg# is pushed along a linear path with a kinetic friction coefficient of #u_k(x)= 1+x^2-xcos(x) #. How much work would it take to move the object over #x in [pi, 4pi], where x is in meters?

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