Question 1: Define gravity in your own words.

Answer: Gravity is the force of attraction between two objects with mass, pulling them towards each other.

Question 2: Explain why objects fall towards the Earth when dropped.

Answer: Objects fall towards the Earth due to the gravitational force exerted by the Earth, pulling objects towards its centre.

Question 3: Which of the following best describes gravitational force?

Answer: A force that acts between objects with mass, pulling them together

Question 4: Fill in the blank: The gravitational force between two objects depends on their masses and the __________ distance between them.

Answer: distance

Question 5: Describe how the mass of an object influences the gravitational force it experiences.

Answer: The greater the mass of an object, the stronger the gravitational force it experiences or exerts.

Question 6: State the formula for calculating the gravitational force between two objects.

Answer: F = G * (m1 * m2) / r^2 where F is the gravitational force, G is the gravitational constant, m1 and m2 are the masses, and r is the distance between the centres of the objects.

Question 7: Calculate the gravitational force between two spheres of mass 5 kg and 10 kg separated by a distance of 2 meters. Use G = 6.67 × 10⁻¹¹ N·m²/kg².

Answer: F = 6.67 × 10⁻¹¹ * (5 * 10) / (2)^2 = 6.67 × 10⁻¹¹ * 50 / 4 = 8.34 × 10⁻¹¹ N

Question 8: List three factors that affect the strength of gravitational force between two objects.

Answer: Mass of objects, distance between objects, and the gravitational constant.

Question 9: Describe an experiment to demonstrate gravity's effect on objects. Include variables to control and measure.

Answer: One possible experiment is dropping objects of different masses from the same height to observe if they land simultaneously, demonstrating that gravitational acceleration is independent of mass. Control variables include the height of release and environmental conditions; measure the time taken to reach the ground.

Question 10: Explain how gravity is utilised in satellite technology and communication.

Answer: Gravity keeps satellites in orbit around the Earth, allowing them to stay in a stable position relative to the surface. It is also used to calculate orbital speeds and trajectories for communication and GPS satellites.