Unbalanced Forces and Unbalanced Forces and MotionMotion

Fifth Grade ScienceFifth Grade Science

Balanced Forces-Balanced Forces- equal equal forces in opposite directionsforces in opposite directions

•Have a net force of zeroHave a net force of zero

Net force- total force acting Net force- total force acting on an objecton an object

Unbalanced ForcesUnbalanced Forces- cause - cause motion or change in the motion or change in the direction in which the object is direction in which the object is movingmoving

o Have a net force that is not Have a net force that is not zerozero

Tug Of WarTug Of War

• When there are equal forces on both sides When there are equal forces on both sides of the rope:of the rope:• The rope does not moveThe rope does not move• There is a net force of zeroThere is a net force of zero• The forces on the rope are balancedThe forces on the rope are balanced

Tug of WarTug of War

o If one person starts to pull harder:If one person starts to pull harder:o The net force will no longer be zeroThe net force will no longer be zeroo The net force will be in the direction of the The net force will be in the direction of the

larger forcelarger forceo The forces on the rope are unbalancedThe forces on the rope are unbalanced

o The rope and the people move in the direction of The rope and the people move in the direction of the larger forcethe larger force

Unbalanced forcesUnbalanced forces

The net force = the larger force – The net force = the larger force – opposite forceopposite force

Forces(Ex: gravity,

friction, magnetic, electric)

Balanced Forces:Do NOT change Motion of objects

Unbalanced Forces:Do change the

Motion of objects

Unbalanced Forces WebsiteUnbalanced Forces Website