A contestant in a winter sporting event pushes a 45-kg block of ice across a frozen lake as shown in the figure. The coefficient of static friction between the block and ice is μs= 0.1, and the coefficient of kinetic friction is μk= 0.03. θ= 25° as shown. (a) Write Newton's Second Law along the y-axis by adding all forces in the y-direction including their signs. Fy,net = F × _ + N × _ + mg × = 0 Using (1) to solve for N (b) N=mg+ _ (c)Write Newton's Second Law along the x-axis by adding all forces in the x-direction including their signs when the block is not moving. Note: fs is the force of static friction. Fnet,x = F × _ + fs × _ = 0 (e) Calculate the minimum force Fmin that must be exerted to get the block moving using part (c). (g) What is the acceleration of the block once it starts to move if the force from part (e) is maintained?
Gravitational force
In nature, every object is attracted by every other object. This phenomenon is called gravity. The force associated with gravity is called gravitational force. The gravitational force is the weakest force that exists in nature. The gravitational force is always attractive.
Acceleration Due to Gravity
In fundamental physics, gravity or gravitational force is the universal attractive force acting between all the matters that exist or exhibit. It is the weakest known force. Therefore no internal changes in an object occurs due to this force. On the other hand, it has control over the trajectories of bodies in the solar system and in the universe due to its vast scope and universal action. The free fall of objects on Earth and the motions of celestial bodies, according to Newton, are both determined by the same force. It was Newton who put forward that the moon is held by a strong attractive force exerted by the Earth which makes it revolve in a straight line. He was sure that this force is similar to the downward force which Earth exerts on all the objects on it.
A contestant in a winter sporting event pushes a 45-kg block of ice across a frozen lake as shown in the figure. The coefficient of static friction between the block and ice is μs= 0.1, and the coefficient of kinetic friction is μk= 0.03. θ= 25° as shown.
(a) Write Newton's Second Law along the y-axis by adding all forces in the y-direction including their signs.
Fy,net = F × _ + N × _ + mg × = 0
Using (1) to solve for N
(b) N=mg+ _
(c)Write Newton's Second Law along the x-axis by adding all forces in the x-direction including their signs when the block is not moving. Note: fs is the
Fnet,x = F × _ + fs × _ = 0
(e) Calculate the minimum force Fmin that must be exerted to get the block moving using part (c).
(g) What is the acceleration of the block once it starts to move if the force from part (e) is maintained?
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