1. Object lies motionless on a surface.
- Forces: Gravity (downward), Normal force (upward)
- Net force: No (object is motionless)
2. Object slides at constant speed along a Smooth (frictionless) surface.
- Forces: Gravity (downward), Normal force (upward)
- Net force: No (constant speed means no acceleration)
3. Object slows due to friction (rough surface).
- Forces: Gravity (downward), Normal force (upward), Friction (opposite to motion)
- Net force: Yes (object is slowing, so there is a net force opposite to motion)
4. Object slides on a smooth incline.
- Forces: Gravity (downward), Normal force (perpendicular to incline)
- Net force: Yes (component of gravity parallel to incline causes acceleration)
5. Friction on an incline prevents sliding.
- Forces: Gravity (downward), Normal force (perpendicular to incline), Friction (up the incline)
- Net force: No (object is not sliding, so forces balance)
6. An object is suspended from the ceiling.
- Forces: Gravity (downward), Tension (upward)
- Net force: No (object is motionless)
7. An object is suspended from the ceiling.
- Forces: Gravity (downward), Tension (upward from each rope)
- Net force: No (object is motionless)
8. The object is motionless.
- Forces: Gravity (downward), Normal force (upward), Applied force (horizontal)
- Net force: No (object is motionless)
9. The object is motionless.
- Forces: Gravity (downward), Normal force (perpendicular to incline), Applied force (horizontal)
- Net force: No (object is motionless)
10. The object is motionless.
- Forces: Gravity (downward), Normal force (perpendicular to incline), Friction (up the incline)
- Net force: No (object is motionless)
Parent Tip: Review the logic above to help your child master the concept of force diagrams worksheet.
