Introduction to Forces

Jill is pushing a box across the floor. Which represents the upward force perpendicular to the floor?

FN

Which force best represents Fg?

The weight of a barbell acting on a weight lifter is 80 N.

Emmett is lifting a box vertically. Which forces are necessary for calculating the total force?

Fp and Fg

An object is moving across a surface, but it does not gain or lose speed. Which best describes the object's force?

The net force is zero.

If forces acting on an object are unbalanced, the object could experience a change in _________ , direction, or both.

speed

Which is the best example of a force counteracting Fp?

two children pulling apart a wishbone

Which is the best example of forces acting in the same direction?

two football players pushing a tackling sled