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Forces and Motion
Transcript of Forces and Motion
of Motion Objects at rest stay at rest until moved by an opposing force. If one object exerts a force on another object,
then the second object exerts a force of equal
strength in the opposite direction on the first object. Polar Express Inertia Action- Reaction The distance of an object that travels in
one unit of time. Speed= Distance/Time Acceleration= Final Velocity-
Initial Velocity/ Time Speed in a given direction. Velocity= Distance/ Time + direction Vocabulary Force of Friction When one surface exerts on another when the two rub against each other. Unbalanced Forces Nonzero net force that changes an object's motion. Tendency of a moving object to continue in a straight line or stationary object to remain in place. Centripetal Force Force that causes an object to move in a circle. Momentum Product of an object's mass and velocity. Applied Force A surface force or body force acting
on an object. Force of Gravity Force that pulls objects towards things. Thank You for Riding
the Polar Express! Yeah! 2nd Law The net force on an object is equal to the product of its acceleration and its mass. Acceleration 50mph = 200 miles/ 4 hours The Polar Express traveled a total of 200 miles in 4 hours. To find the speed, the distance is divided by the time. 60 mph North=360 miles/ 6 hours The train traveled 60 miles per hour, north to the North Pole. Rate of velocity going forward Positive Acceleration- Acceleration in a direction opposite to the velocity. Negative Acceleration- 2 meters per second=25 meters per sec. - 15 meters per sec./ 5 sec. (The force that makes the train turn.) In order for the train to move, it uses friction against its wheels and tracks. The wolves use friction to walk too! The force of the train is greater than the forces of gravity and wind. Wind and Gravity's Force Train's Force 35N 50N Inertia As the train comes to a sudden stop, the boy jerks forward. When the waiters go up, they must come down. (That's gravity pulling them to the floor of the train.) 50 mph The ticket was moved by the applied force of the wind. Momentum = mass x velocity " mass in motion" 100,000 kg 50 mph North starting speed: 20 mph accelerated to: 60 mph starting speed: 40 mph ending speed with negative acceleration: 15 mph North Pole ahead! Action: Waiter applies force Reaction: Hot chocolate cart moves!