1. Which of the following statements is true? A) The force due to spring is a constant force B) The net force acting on a 10-kg motionless block from a string attached to a ceiling is 98 N. C) The normal force of an object is always parallel with the force due to gravity with opposite direction. D) Friction forces is always directed opposite to the displacement of an object.
II.
1. Which of the following statements is true?
A) The force due to spring is a constant force
B) The net force acting on a 10-kg motionless block from a string attached to a ceiling is 98 N.
C) The normal force of an object is always parallel with the force due to gravity with opposite direction.
D) Friction forces is always directed opposite to the displacement of an object.
2. Which of the following has the most positive change in kinetic energy.
A) A block release from rest at a certain height colliding a spring at maximum compression
B) A car decelerating
C) A fruit falling from a tree (just before it hits the ground).
D) A boat sailing at a constant rate to an island
2. Which of the following is not true about the Newton’s laws of motion?
A) For every action, there is an equal and opposite reaction.
B) An object at rest will remain at rest unless acted by some external force.
C) The net force is inversely proportional to the mass of an object
D) The net force is directly proportional to the acceleration of an object
3. An insect collides with the windshield of a moving car. Which of the two experiences a larger net force due to the collision?
A) The car C) The same magnitude of force is experienced by both
B) The insect D) Can’t be determined
4. Which of the following statements is false?
A) frictional force is a non-conservative force
B) gravitational force is a conservative force
C) conservative forces are path independent while non-conservative forces are path dependent
D) all statements are true
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