Question

Momentum Practice Problems

Use your knowledge about solving equations to work out the following problems. Be
sure to show all your work with units:
1. If the truck has a mass of 2,000 kilograms, what is its momentum? (v = 35 m/s)
Express your answer in kg:m/sec.
2. If the car has a mass of 1,000 kilograms, what is its momentum? (v = 35 m/s)
3. An 8-kilogram bowling ball is rolling in a straight line toward you. If its momentum is 16
kg.m/sec, how fast is it traveling?
4. A beach ball is rolling in a straight line toward you at a speed of 0.5 m/sec. Its
momentum is 0.25 kg.m/sec. What is the mass of the beach ball?
5. A 4.000-kilogram truck travels in a straight line at 10.0 m/sec. What is its momentum?
6. A 1,400-kilogram car is also traveling in a straight line. Its momentum is equal to that
of the truck in the previous question. What is the velocity of the car?

Answer 1

1. 70000 kg. m/s

2. 35000 kg. m/s

3. 2 m/s

4. 0.5 kg

5. 40 kg. m/s

6. 0.03 m/s

Step-by-step explanation:

1. p = mv

p =?

m = 2000kg

v = 35 m/s

p = 2000 × 35

p = 70000 kg.m/s

2. p = mv

p =?

m = 1000kg

v = 35m/s

p = 1000 × 35

p = 35000kg.m/s

3. p = mv

p = 16kg.m/s

m = 8kg

v = ?

16 = 8 × v

divide both sides by 8

16 = 8 × v

__ _____

8 8

2 = v

v = 2m/s

4. p =mv

p = 0.25kg.m/s

m = ?

v = 0.5m/s

0.25 = m × 0.5

divide both sides by 0.5

0.25 = m × 0.5

___ ______

0.5 0.5

0.5 = m

m = 0.5kg.

5. p = mv

p = ?

m = 4kg

v = 10m/s

p = 4 × 10

p = 40kg.m/s

6. p =mv

using momentum from previous question as specified

p = 40kg.m/s

m = 1400kg

v = ?

40 = 1400 × v

divide both sides by 1400

40 = 1400 × v

____ ______

1400 1400

0.03 = v

v = 0.03m/s.