Download Chapter 6 Forces and Motion

Chapter 6 Forces and Motion
Notes/ Study Guide
Terminal Velocity- The constant velocity of a falling object when the force of air resistance is equal in
magnitude and opposite in direction to the force of gravity.
Free fall - the motion of a body when only the force of gravity is acting on the body.
Projectile motion- the curved path that an object follows when thrown launched or otherwise projected near the
surface of Earth.
Inertia- the tendency of an object to resist being moved, or if the object is moving, to resist a change in speed or
direction until an outside force acts on the object.
Momentum- a quantity defined as the product of the mass and velocity of an object.
To find momentum you must multiply mass X velocity (p= m x V)
Newton’s First Law of Motion- An object at rest remains at rest and an object in motion remains in motion, at
constant speed and in a straight line unless acted on by an unbalanced force
Newton’s Second Law of Motion- the acceleration of an object depends on the mass of the object and the
amount of force applied. F = m x a
Newton’s Third Law of Motion- whenever one object exerts a force on a second object, the second object
exerts an equal and opposite force on the first. All forces act in pairs.
All objects accelerate to the earth at the rate of 9.8m/s/s
All objects fall at the same rate UNLESS there is air resistance
Projectile motion is two directions – horizontal in the air and then vertically down -pulled by gravity.
The conservation of momentum states that when two objects collide, their combined momentum stays the same.
When a bowling ball and pin collide, the momentum of the ball decreases while the velocity of the pin
increases.
****Know the paths of the spacecraft in your study guide from the week.
Essay- is to explain two ways a football player can gain force according to Newton’s Second Law of Motion.
Newton’s Second Law of Motion states force equals mass times acceleration. A football player gets his force from the
combination of his mass and acceleration, so increasing either one will increase the force. For example, if he goes to the
gym and works out to gain more muscles, his force will be increased when he runs into the opponent. On the other hand,
if he goes to track and gets his acceleration increased, his force will also go up when he hits the other player.