4. A soccer ball with a mass of 0.510kg is initially moving with a speed of 2m/s. A soccer player kicks the ball, exerting a constant force of magnitude 40N in the same direction as the ball's motion. Over what distance in meter must her foot be in contact with the ball to increase the ball's speed to 6m/s? a) 0.89 b) 0.168 c) 0.209 d) 0.705 e) 0.654

O 1:r :Q1) Multiple Choice Question is the action of one body on another. a-) Force b-) Mass c) Acceleration d-) Time 2- The unit of the moment of force is. a-) Kg/m b-) m/s e-)N. m 3. is the force resisting the relative motion of two surfaces in d-) Kg. m/ s contact. a-) Moment b-) Moment of couples c-) Lift force d-) Friction force is a vector quantity. a-) Time b-) length c) velacity d-) Mass 4- 5- is the science which deals with the effects of forces on objects. a-) Mathematics b-) Mechanics c-) Chemistry d-) Computer إجابتك Q2) Determine the magnitude of the resultant force (R) acting on the screw eye, .as shown in Figure 1 45° 60° 2 kN II

6. The speed of a particle moving in a circle with radius 2.0 m increases its speed constantly at a rate of 4.4 m / s2. At an instant when the magnitude of the total acceleration is 6.0 m / s2, what is the velocity of the particle?   Answers: a) 3.9 m/s       b) 2.9 m/s      c) 3.5 m/s      d)   3.0 m/s      e) 1.4 m/s

Pushing a Block and a Wedge 0 points possible (ungraded) In the following problem, you are asked to: i) Define the system and the environment: Identify which objects - the environment - interact with the object of interest - the system. Justify your choice of system: would a different choice also work? If not, why not? If so, why is the choice you made better? ii) Describe the interactions and the resulting forces: Identify the forces exerted on the object of interest by the other objects. iii) Draw the free body diagram of the object: Make sure that each force arrow is labeled with two subscripts - who is exerting the force and on whom is the force being exerted. The length of the arrows should represent qualitatively the magnitude of the force. a) c) M m 0 a F M m 0 A block of mass m rests on a frictionless wedge which has a mass M and whose surface makes an angle to the horizontal as Calculator