Acceleration & Force

1. Acceleration & Force

2. Acceleration • Acceleration is change in velocity divided by the time interval in which the change occurred. • Acceleration Equation- acceleration= Final velocity-initial velocity time

3. Force • Force is the cause of acceleration, or change in an objects velocity. When you throw or catch a ball, you exert a force to change the ball’s velocity.

4. Balanced Forces Balanced Forces are forces acting on an object that combine to produce a net force equal to zero. In tug of war each side exerts a force on the rope. If the opposing forces are equal, they are balanced & the rope does not move.

5. Unbalanced Forces Unbalanced Forces are forces acting on an object that combine to produce a net nonzero force. • If one force is greater than the other, the forces are unbalanced, & the rope moves in the direction of the greater force.

6. Friction is the force between two objects in contact that opposes the motion of either object. Friction provides the force needed to balance the force of gravity & prevent the truck from moving down hill. If I car is rolling along a flat evenly paved street, if no force is acting on it, the car will keep slowing down until it eventually stops. This steady change in the cars speed gives you a clue that a force must be acting on the car. This unbalanced force that acts against the car’s direction of motion is friction. Friction

7. Gravity is the attraction between two particles of matter due to their mass. Gravity depends on- mass & the distance between the two objects. The greater the mass of an object, the larger the gravitational force it exerts on other objects. Gravitational force rapidly grows weaker as the distance between two objects increases. Gravity