INTRDUCTION TO FORCE

• Force is a push or a pull exerted on an object that may change the motion or shape of the object
• Force has strength and direction
• Newton is the SI unit for force (symbol, N)
• Velocity is the speed of an object in a particular direction
• Acceleration is the rate at which velocity changes over time; an object accelerates if its speed, direction, or both change
• Balanced and unbalanced forces can predict changes in an object's motion
• Forces can change the speed or direction of an object's motion
• Forces are given in the unit called the newton (N)
• Forces can act on an object even when it is not moving
• Forces can change the shape of an object
• Forces have both strength and direction, with positive and negative forces
• Contact forces only act between objects that are touching, while noncontact forces act at a distance
• Speed is the rate at which a distance is traveled
• An object's velocity changes if either its speed or its direction changes
• Speed = Distance/time
• Average speed = Total distance/Total time
• Distance is the distance an object travels from point A to point B (SI unit is the meter)
• The sign of a velocity indicates its direction
• In a Venn diagram, compare between contact and noncontact forces
• Calculate the speed of a rocket that travels 9000 meters in 12.12 seconds
• Calculate the distance a paint chip lands after leaving a satellite at a speed of 96 m/s and traveling for 17 seconds
• Calculate the time for a trip if traveling 350 km at an average speed of 80 km/h
• Velocity is the speed of an object in a direction
• Velocity changes if either its speed or its direction changes
• Acceleration is the rate at which velocity changes over time
• Acceleration can result from a change in speed, a change in direction, or changes in both
• Acceleration refers to increasing speed, decreasing speed, or changing direction
• Acceleration is a vector
• Acceleration = Change in velocity / Total time
• Change in velocity = final velocity - initial velocity
• Acceleration = (Final speed - Initial speed) / Time
• A roller-coaster car's average acceleration is 6 m/s^2
• In 0.5 seconds, a projectile goes from 0 to 300 m/s. The acceleration of the projectile is
• A meteoroid changed velocity from 1.0 km/s to 1.8 km/s in 0.03 seconds. The acceleration of the meteoroid is
• The space shuttle releases a space telescope into orbit around the earth. The acceleration of the satellite is