Force to Move Objects from Rest

Experiment 2:

Objective: Is greater force required than regular force?

Hypothesis: I think that the force is greater than force required to keep the cart moving.

Materials Used: 8"inch string, wooden ramp, 200 gram mass, cart spring scale

Procedure:

1. Cut a piece of string about 8" long. Tie one end to the front of the Hall's cart and tie a loop in the free end.

2. Put the 200 gram (g) mass in the Hall's cart.

3. Push the cart back and forth on the table and think about the problem statement. Write down your hypothesis before you begin the procedure.

4. Zero the spring scale and attach the hook on the spring scale to the string loop on the cart.

5. Tug on the spring scale several times to start the cart moving from rest. Note and record the spring scale reading each time.

6. Now jerk on the spring scale several times to rapidly start the cart moving from rest. Note and record the spring scale readings.

7. Finally, pull the cart across a table or floor at a constant speed several times. Note and record the spring scale readings each time. Try this step again, pulling the cart at a faster speed and record your results.

Data:

Tug: Jerk: Constant Speed: Faster Speed:
Trial 1-.5n (50 g) Trial 1-.5n (50 g) Trial 1- .5n (50 g) 1.5 n (150 g)
Trial 2-1n (100 g) Trial 2- 1n (100 g) Trial 2- .8n (80 g) 1n (100 g)
Trial 3-.5n (50 g) Trial 3- 1n (100 g) Trial 3- .5n (50 g) 1.5n (150 g)

Conclusion:

1. It takes greater force to start an object moving.

2. It takes greater force to start an object moving slowly.

3. My hypothesis was correct.

4. No, it doesn't follow Newton's Law