Mechanics questions | form five Physics

1. List down two limitations of projectile motion.
2. A body projected from the ground at the angle of 60° is required to pass just above the two vertical walls each of height 7m. If the velocity of projection is 100ms^​-1​ , calculate the distance between the two walls.

Answer / Solution

UNSOLVED

A fireman standing at a horizontal distance of 38m from the edge of the burning storey building aimed to raise streams of water at an angle of 60° into the first floor through an open window which is at 20m high from the ground level. If water strikes on this floor 2m away from the outer edge,

1. Sketch a diagram of the trajectory.
2. What speed will the water leave the nozzle of the fire hose?

Answer / Solution

UNSOLVED

1. Mention three effects of looping the loop.
2. Why there must be a force acting on a particle moving with uniform speed in a circular path? Write down an expression for its magnitude.

Answer / Solution

UNSOLVED

A driver negotiating a sharp bend usually tend to reduce the speed of the car.

1. What provides the centripetal force on the car?
2. Why is it necessary to reduce its speed?

Answer / Solution

UNSOLVED

A ball of mass 0.5​ kg is attached to the end of a cord whose length is 1.5​ m then whirled in horizontal circle. If the cord can withstand a maximum tension of 50​ N ​ , calculate the:

1. Maximum speed the ball can have before the cord breaks.
2. Tension in the cord if the ball speed is 5​m ​/ ​s ​ .

Answer / Solution

UNSOLVED