2. what happens when multiple forces act on an object?
a. the object will always move.
b. the object will move if the forces are balanced.
c. the object will move if the forces are unbalanced.
d. the object will always stay in place.
3. an object moves in the direction of the force.
a. net
b. balanced
c. strongest
d. weakest

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?