Physics Past Questions and Answers

An object is acted upon by a system of parallel forces causing the object to be in static equilibrium. Which of the following statements is not correct?

A The resultant of the parallel force is zero
B The algebraic sum of the moment of the forces is zero
C All the parallel forces must be equal in magnitude and in direction
D The sum of the forces in one direction must be equal to the sum of forces in the opposite direction

Question 852:

An object A is held in equilibrium as illustrated in the diagram above. Using the data on the diagram determine the magnitude, W of the weight of

A 23N
B 17N
C 7N
D 5N

Question 853:

A spiral spring of natural length 30.0cm and force constant of 20Nm^-1 is compressed to 20.0cm. Calculate the energy stored in the spring

A 0.1J
B 1.0J
C 10.0J
D 100.0J

Question 854:

In the diagram above, AB represents a uniform rod of length 1.50m which is in equilibrium on a pivot at P, If AP = 40cm, calculate the mass of the rod. [g = 10ms^-2]

A 0.280kg
B 0.400kg
C 0.613kg
D 0.800kg

Question 855:

Which of the following statements correctly defines quantitatively the work done by a force? the product of the force and the distance moved

A Parallel to the line of action of the force from a reference point
B Perpendicular to the line of action of the force from a reference point
C On a line through the reference point
D By the object