Final answer:
Testing the locking feature of an SRD by pulling down on the line quickly and forcefully is correct to ensure safety. Additionally, credit cards shouldn't be near magnets, position vs time graphs of speeding objects are not straight lines, and the force when pushing objects up a ramp depends on various factors.
Step-by-step explanation:
The locking feature of an SRD (Self-Retracting Device) in the context of safety equipment is crucial for fall protection. When testing an SRD, it's vital to pull down on the line quickly and forcefully to ensure the locking mechanism works as intended.
Regarding the other parts of this question, here's a brief insight:
- True: Credit cards with magnetic strips should not be placed near permanent magnets to avoid demagnetization and data loss.
- False: The position vs time graph of an object that is speeding up is not a straight line, it curves upward, reflecting increased velocity over time.
- In the case of a tug-of-war where the rope snaps, the forces involved are equal and opposite until the moment of the snap, resulting in participants stumbling backwards due to the sudden release of tension.
- False: When pushing an object up a ramp, the force needed depends on multiple factors including friction, and mechanical advantage, not just the height and length of the ramp.