12 1 Forces Gravity Gravity is a force
- Slides: 7
12. 1 Forces Gravity ***Gravity is a force that acts between any two masses. • Gravity is an attractive force. • Gravity can act over large distances.
12. 1 Forces Gravity Earth exerts an attractive, downward force on this boulder. The supporting rock exerts an upward force on the boulder. The forces are balanced.
12. 1 Forces Gravity Falling Objects • Both gravity and air resistance affect the motion of a falling object. • As objects fall to the ground, they accelerate and gain speed. • ***Terminal velocity is the constant velocity of a falling object when the force of air resistance equals the force of gravity.
12. 1 Forces Gravity This flying squirrel takes advantage of air resistance to slow its fall and increase the distance covered in the jump.
12. 1 Forces Projectile Motion A thrown ball follows a curved path. ***Projectile motion is the motion of a falling object (projectile) after it is given an initial forward velocity. Air resistance and gravity are the only forces acting on a projectile.
12. 1 Forces Projectile Motion A. Their masses are different, but the blue and green balls fall at the same rate. A. All objects (when you negate friction) fall towards Earth at the same rate (-9. 81 m/s 2)
12. 1 Forces Projectile Motion A. Their masses are different, but the blue and green balls fall at the same rate. B. The yellow ball is a projectile, following a curved path.
