Law of Gravitation WS I



Conservation of Momentum (P) WS I

m1v1 + m2v2 (before event) = m1v1 + m2v2 (after event)

Assume that the sum of any external forces acting on the system is zero. Note: The arrows are just supposed to show the direction of the car’s movement. They do not represent the magnitude of the velocity.

1) Find the final velocity of the car on the right hand side.

|Before the collision|[pic] |

| | |

|total p = _____ | |

| | |

|After the collision |[pic] |

| | |

|total p = _____ | |

| | |

2) After the collision, the two cars stick together. Find the final velocity of the two cars.

|Before the collision|[pic] |

| | |

|total p = | |

| | |

|_____ | |

|After the collision |[pic] |

| | |

|total p = | |

| | |

|_____ | |

3) After the collision, the two cars stick together. Find the initial velocity of the car on the right hand side.

|Before the collision|[pic] |

| | |

|total P = | |

| | |

|_____ | |

|After the collision |[pic] |

| | |

|total p = | |

| | |

|_____ | |

4) Two carts are at rest with a spring in between them. The spring is released. Find the mass of the cart on the right hand side.

|Before the spring is|[pic] |

|released | |

| | |

|total p = | |

| | |

|_____ | |

|After the spring is |[pic] |

|released | |

| | |

|total p = | |

| | |

|_____ | |

What is the momentum of an object at rest?

What is the weight (force from gravity) for an object whose mass is 10 kg?

What do you call the force that keeps you from falling through the floor?

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10 kg

V = 2 m/s

V = -1 m/s

30 kg

V = -1 m/s

V = ?

10 kg

30 kg

10 kg

V = 2 m/s

V = 0

10 kg

V = ?

10 kg

10 kg

100 kg

V = 30 m/s

50 kg

V = ?

V = 20 m/s

100 kg

50 kg

50 kg

? kg

V = 0 m/s

V = 5 m/s

50 kg

? kg

V = -2 m/s

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