Horizontal force pulls a body of 2.25 kg a distance of 8 m across a rough horizontal surface, coefficient of friction 1/3. The body moves with constant velocity and the only resisting force is due to friction. Find the work done against friction. [2 marks] Q2
The point A is 4 m vertically above the point B. A body of mass 0.2 kg is projected from A vertically downwards with speed 3 m/s. Find the speed of the body when it reaches B. [7 marks]
Q3
A body of mass 2 kg, passing through two points A and B. The speeds of the body as it passes A and B are 1 m/s and 4 m/s respectively. The resistance against which the body falls is 9.6 N. Use energy considerations to determine the distance AB. [5 marks]
Q4
A particle is projected horizontally with a velocity of 39.2 ms-2. Find the horizontal and vertical components of the velocity of the particle 3 seconds after projection. Find also the speed and direction of motion of the particle at this time. [6marks]​

True or false a high force means an object is moving fast100 points!

Dinate system, and a charge q = - 2.00 nc is placed s2 10 n> c. (a) what is the change in electric potential energy when the dipole moment of a molecule changes its orientation with respect to es from parallel to perpendicular? (b) at what absolute temperature t is the average translational kinetic energy 32 kt of a molecule equal to the change in potential energy calculated in part(: abovethistemperature,thermalagitationprevents the dipoles from aligning with the electric field.) placed in a uniform electric field e with magnitude 1.6 * 6 on the positive x-axis at x = 4.00 cm. (a) if a third charge q3 = +6.00 nc is now placed at the point x = 4.00 cm, y = 3.00 cm, find the x- and y-components of the total force exerted on this charge by the other two. (b) find the magnitude and direction of figure p21.62 ll uu 21.55 . torque on a dipole. an electric dipole with dipole moment ps is in a uniform external electric field es. (a) find the orientations of the dipole for which the torque on the dipole is zero. (b) which of the orientations in part (a) is stable, and which is unstable? (hint: consider a small rotation away from the equi- librium position and see what happens.) (c) show that for the stable orientation in part (b), the dipole’s own electric field tends to oppose the external field. 21.62 ..

=force × distance a. work b. velocity c. pressure d. momentum