WJEC Physics for AS Level: Revision Workbook

Q5 The following is a list of quantities met in A level physics. Divide them into scalar and vector quantities. [2] energy acceleration time density temperature velocity momentum pressure ......................................................................................................................................................................................................................................................................................................................................... Q6 One of the kinematic equations for constant acceleration is v = u + at . Show that this equation is homogeneous. [2] ......................................................................................................................................................................................................................................................................................................................................... ......................................................................................................................................................................................................................................................................................................................................... ......................................................................................................................................................................................................................................................................................................................................... ......................................................................................................................................................................................................................................................................................................................................... Q7 Two forces act on an object. The forces have magnitudes of 28 N and 45 N. Draw diagrams to show how the resultant force can have magnitudes of: (a) 73 N, (b) 17 N and (c) 53 N. [4] In each case, state the direction of the resultant force relative to the 45 N force. [Hint: 28 2 + 45 2 = 53 2 ] (a) Direction = ........................................................................................................... (b) Direction = ........................................................................................................... (c) Direction = ........................................................................................................... Q8 A force acts at 25° to the horizontal. The magnitude of the vertical component of the force is 53 N. Calculate: (a) The magnitude of the force. [2] ......................................................................................................................................................................................................................................................................................................................................... ......................................................................................................................................................................................................................................................................................................................................... ......................................................................................................................................................................................................................................................................................................................................... (b) Its horizontal component. [1] ......................................................................................................................................................................................................................................................................................................................................... ......................................................................................................................................................................................................................................................................................................................................... Section 1 Basic physics | 13 Unit 1 Practice questions