51

Physics Force & Laws Of Motion Level: High School

A bullet of mass 100 g is fired horizontally into a 14.9 kg block of wood resting on a horizontal surface, with the bullet becoming embedded in the block. If the muzzle velocity of the bullet is 250 m/s , what is the velocity of the block containing the bullet immediately after the collision ? If the coefficient of the friction between the block and the surface is 0.60. how far will the block slide before coming to rest ?

50

Physics Force & Laws Of Motion Level: High School

A gong is suspended by two ropes . One makes an angle of 25 degrees with the vertical and is under tension of 70 N . The other rope makes an angle of 40 degrees with the vertical. Find the mass of the gong and the tension in the second rope ?

49

Physics Force & Laws Of Motion Level: High School

A 15 gram bullet is fired into a 10 kg wounded box which is mounted on small, frictionless wheels. Before the shot, the block is at rest. After the bullet hits the block, the combination of the two masses travels 45 cm in 1 second.

a) Calculate the velocity of the bullet before it hits the block.

b) What impulse is delivered to the block by the bullet ?

c) How much work was done on the block by the frictional forces exerted between the bullet and the block ?

d) How much work was done on the bullet by the frictional forces exerted between the bullet and the block ?

e) Is kinetic energy conserved in this solution ? Give numerical evidence.


48

Physics Force & Laws Of Motion Level: High School

A bicycle and rider together weigh 186 lbs . when moving at 10 mi/hr on a level road, the rider ceases to pedal and observes that she comes to a stop after traveling 200 yds.

a) How much work was done by the frictional force ?

b) What was the average frictional force resisting her motion ?


47

Physics Force & Laws Of Motion Level: High School

A certain horse says, "There is no use trying to pull that cart. No matter how hard I pull on cart, -it will always pull back on me with exactly the same force. So I can never make it go , " Explain what is wrong with the horse's reasoning. (Free-body diagrams ,showing all the forces involved , will help )

42

Physics Force & Laws Of Motion Level: High School

A 15.0 kg uniform board 2.4 m long is pivoted so that it can rotate at a horizontal axis through the end (point A). If a 100-kg mass and is suspended 1.80 m from the pivoted end, what is the tension in the string ?

41

Physics Force & Laws Of Motion Level: High School

Two masses are suspended from a frictionless pulley as shown in "click here " The pulley itself if has a mass of 10.kg and its radius r = 10 cm.

(a) what is the magnitude of the acceleration of the suspended masses is m1 = 8 kg

(b) what are the tension in the strings? (Neglect the mass of the string.)


40

Physics Force & Laws Of Motion Level: High School

Two blocks are connected by a cable via a pulley which are massless and frictionless. Given the following: m=300.0 kg, m2= 100.0 kg, theta = 40.0 degree, micro = 0.350, determine:

a. The direction of acceleration (mathematically no guesses)

b. The value of acceleration

c. The tension in the cable

(Figure is shown in "click here")

29

Physics Force & Laws Of Motion Level: High School

A box of mass 8.3 kg placed on a smooth horizontal table is acted on by two horizontal forces . The first of magnitude 0.3 Newton's acts due East , and the second of magnitude 0.3 Newton's acts due North . Find the velocity of the box after 14.9 seconds .

26

Physics Force & Laws Of Motion Level: High School

A stone of m = 0.8 kg is projected across a sheet of ice with an initial speed of 2.40m s^-1 . The coefficient of sliding friction between the stone and the ice is 0.0250 . How far will the stone travel before it come to rest ? Take g = 9.81m s^-2 .

24

Physics Force & Laws Of Motion Level: High School

Blocks A and B are moving towards each other along the X axis. A has a mass of 4.00 kg and a velocity of 30.0 m/s ( in the positive X direction), While B has a mass of 2.00 kg and a velocity of -25.0 m/s (in the negative direction). A) Assume they sugffer an elastic head-on collision and move off along the X axis. What will be the velocity of A and B , respectively , after the collision ? B) Using the information from a) and using impulse-momentum theorem, calculate the force acting on block A due to block B if the collision took a time of 0.256s C) If these same two blocks were to have a perfectly inelastic head-on collision, what would the velocity of the combined block system be and what would be the loss in KE?

23

Physics Force & Laws Of Motion Level: High School

A girl and her bicycle have a total mass of 40.0 kg. At the top of a hill her speed is 5.00 m/s the hill is 10.0 m high vertically and 100.0 m along the incline use work energy methods A) Take friction to be acting . If her speed was 10.0 m/s as she arrives at the bottom of the hill , how much mechanical energy is lost to friction? Note girl doesn't pedal . B) From your answer to part A calculate the force of the frictional resistance of the air , etc , that is removing useful mechanical energy from the system as the girl rolls down the hill . C) Now if the girl and her bike coast along level ground , how far will she coast if the coefficient of the Kinetic Friction is 0.300 ?

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