PhysicsClass 9en

🌍 Gravitation and Free-Fall

Explore the fundamental concepts of gravitational force, weight, and the motion of freely falling objects. **What you'll learn:** - Distinguish between mass and weight, and how gravity affects each - Calculate gravitational force using Newton's law of universal gravitation - Understand acceleration due to gravity and its value on Earth - Analyze the motion of objects in free-fall - Apply kinematic equations to solve free-fall problems

10 questions · play in your browser

No signup required — try it for free.

Questions in this quiz

Answers hidden — play to find out.

Question 1
Mass and weight are the same thing and can be used interchangeably in physics.
Question 2
What is the approximate value of acceleration due to gravity ( $g$ ) on Earth's surface?
Question 3
The weight of an object is calculated using the formula $W =$ ___ $\times g$ , where $g$ is the acceleration due to gravity.
Question 4
An object in free-fall experiences zero acceleration because gravity and air resistance balance out perfectly.
Question 5
A ball is dropped from rest from a height of 20 m. Assuming no air resistance and $g = 10 \text{ m/s}^2$ , how long does it take to hit the ground?
Question 6
Newton's law of universal gravitation states that the gravitational force between two objects is directly proportional to the product of their masses and inversely proportional to the square of the ___ between them.
Question 7
An astronaut on the Moon experiences no gravitational force because it has no atmosphere.
Question 8
A stone is thrown upward with an initial velocity of $20 \text{ m/s}$ . At the highest point of its trajectory, what is its velocity? (Assume $g = 10 \text{ m/s}^2$ )
Question 9
If the distance between two objects is doubled, the gravitational force between them is reduced by a factor of ___.
Question 10
Arrange the following steps in the correct order for solving a free-fall problem involving initial velocity and final velocity.