Freefall & Motion

Q. The value of acceleration due to gravity decreases with increase in ___.

1. weight
2. horizontal displacement
3. altitude
4. momentum

Q.

In which of the following cases, the objects mentioned are in free fall, assuming no friction or air resistance?

1. An object dropped from a certain height
2. An object is thrown upward
3. Flying in an aircraft
4. A car accelerating at $9.8m{s}^{-2}$ on the road

1. Only 1^st

2. Only 3^rd

3. 1^st and 2^nd both

4. 1^st and 3^rd both

Q. From certain height two bodies are thrown horizontally with velocity $10m/s\&20m/s$. They hit the ground in time $t_1\&t_2$, then find the relation between $t_1\&t_2$.

Q. Acceleration due to gravity at poles is ___ than/as that at equator.

Q.

What type of path does an object follow if the acceleration of the object is constant in magnitude but not in direction?

Q. Which of the following is TRUE about acceleration due to gravity.

1. Acceleration due to gravity is the acceleration acting on a body under free fall towards earth.
2. Its average value is $9.8m/s^2$.
3. Acceleration due to gravity always acts towards center of earth.
4. All of the above

Q. Suppose a ball of mass m is thrown vertically upward with an initial speed, v its speed decreases continuously till it becomes zero. Thereafter, the ball begins to fall downward and attains the speed vagain before striking the ground. It implies that the magnitude of initial and final momentum of the ball is same. Yet, it is not an example of conservation of momentum. Explain why?

Q. A body of mass 1 kg is thrown vertically up with an initial speed of 5 m/s. What is the magnitude and direction of force due to gravity acting on the body when it is at its highest point? Take $G=9.8n/kg$

Q.

1. the gravitational force is the same on each
2. their weights are equal
3. the ratio of weight to mass for all objects is a constant
4. the inertia of all objects is the same
5. the ratio of force to acceleration for all objects is a constant