Unit 2 - 2D Kinematics

• Vector - a physical quantity with both magnitude and direction

• Resultant - the sum of two or more vectors

• Resolving a vector into components - replacing a vector with scalers

Horizontal Free Fall

• Projectile motion - the motion of an object projected in a gravitational field, such as from Earth's surface, and moving along a curved path

• when an object starts freefall, nothing changes the horizontal axis unless a force acts on it

• if one object is dropped horizontally and the other vertically from the same height, both objects will land on the ground at the same time because they have the same vertical velocity

• vertical velocity determines the time they reach the ground, while the horizontal velocity determines how far the horizontally thrown object travels on the x-axis

Parabolic Motion

• completely symmetrical movement of the object thrown

• velocity, x, and y are always changing so x and y are described seperately

• as the horizontal velocity increases the free fall stretches more

• v_ix = v_icosθ

• v_iy = v_isinθ

• horizontal velocity never changes

• vertical velocity before it hits = -v_iy

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