Forces

Forces Explained

Forces A force is a push or pull that one body exerts on another Formula F = Mass x Acceleration = M x A = kg x m/s/s = kg-m/s2 = Newtons Force = Newtons Fig-Newtons (way to remember)

Forces Balanced – Equal Forces acting in opposite direction cancel each other out, so no movement occurs

Forces Unbalanced forces – (acceleration) Unequal Forces acting in opposite direction will cause object to Speed up, Slow down, or Change direction of motion

Forces Practice Equations What force is needed to give an object with a mass of 25.0 kg an acceleration of 15.0 m/s2 ? F = ? M = 25.0 kg A = 15.0 m/s2 F = 25.0 kg x 15.0 m/s2 F = 375 kg-m/s2 F = 375 N

Forces Practice Equations What force is needed to move an object with a mass of 12.5 kg an acceleration of 10.0 m/s2 ? F = ? M = 12.5 kg A = 10.0 m/s2

Gravity Acceleration (due to gravity) = 10 m/s/s Represented by letter g So anything that is falling vertically (down) on Earth has the same acceleration = 10 m/s2

50 kg ~ 110 pounds Weight vs. Mass Weight = mass x gravity = mass x acceleration Weight = m x g Weight = m x 10 m/s2 50 kg ~ 110 pounds

Work Work is the amount of Force moved over a distance Formula W = Force x distance W = F x d W = (m x a) x d Example =50kg x 10m/s2 x 2m =1000 Joules

Practice Problems A mule pulls a cart of milk 10 meters with a force of 50 Newtons How much work done on a pumpkin with a force of 16 newtons when lifted 15 meters Mark pushed his stalled car with a force of 9000 N but was unable to move it, how much work?

More Practice A box is pushed 40 meters by a mover, amount of work done was 2240 joules, how much force? What distance did the boulder with a force of 24 newtown travel if 240 joules of work was done on it?