Forces and Motion in Physics

Forces Acting on Objects

• Friction is a force that opposes the motion between two touching objects, acting in the opposite direction of motion.
• Gravity is a force that attracts objects toward the center of the Earth, responsible for why objects fall.

Eagle and Kestrel Characteristics

• An eagle can weigh up to 29 kg (63 lb) and has the capability to carry large prey while flying.
• A kestrel, in contrast, weighs less than 1 kg (2 lb) and cannot carry more than its own weight due to the pull of gravity.

Weight and Gravity

• An object's weight is determined by the strength of gravity acting on it; it varies based on mass and gravitational force.
• A large rock is significantly heavier than a pillow, illustrating that gravity exerts greater force on larger mass objects.

Rockets and Forces

• Rockets are extremely heavy and require a significant unbalanced force to overcome gravitational pull in order to ascend from the Earth's surface.