# Change of Momentum of 4.5 kg Object at 53° Angle

• cstout
In summary, the formula for calculating the change of momentum of an object is Δp = mΔv, where Δp is the change in momentum, m is the mass of the object, and Δv is the change in velocity. To calculate the magnitude of the change in momentum, we can use the formula |Δp| = m|Δv|. The angle of impact does not affect the overall magnitude of the change in momentum, but it does determine the direction of the change. The change in momentum can be negative if the object experiences a decrease in velocity. And finally, the change in momentum is directly proportional to the net force applied to the object and is also affected by the direction of the force.
cstout

## Homework Statement

An object of mass 4.5 kg is projected into the air at a 53° angle. It hits the ground 3.6 s later. What is its change in momentum while it is in the air? Ignore air resistance.

P = mv V=Ft/m

## The Attempt at a Solution

I'm not sure how to find the velocity for this question, otherwise I know how to find the answer.

I would approach this problem by first using the given information to calculate the initial velocity of the object. We can use the equation V = u + at, where u is the initial velocity, a is the acceleration due to gravity (9.8 m/s^2), and t is the time in the air (3.6 s). Plugging in the values, we get:

V = u + (9.8 m/s^2)(3.6 s)
V = u + 35.28 m/s

Next, we can use the equation P = mv to calculate the initial momentum of the object, where m is the mass (4.5 kg) and v is the initial velocity we just calculated. This gives us:

P = (4.5 kg)(u + 35.28 m/s)
P = 4.5u + 158.76 kg·m/s

Now, to find the change in momentum while the object is in the air, we can use the equation P = mv once again, but this time we will use the final velocity (0 m/s) and the same mass (4.5 kg). This gives us:

P = (4.5 kg)(0 m/s)
P = 0 kg·m/s

Therefore, the change in momentum of the object while it is in the air is:

ΔP = (0 kg·m/s) - (4.5u + 158.76 kg·m/s)
ΔP = -4.5u - 158.76 kg·m/s

We can also express this in terms of the initial velocity (u):

ΔP = -4.5u - 158.76 kg·m/s

In summary, the change in momentum of the 4.5 kg object at a 53° angle while it is in the air is -4.5u - 158.76 kg·m/s, where u is the initial velocity.

## 1. What is the formula for calculating the change of momentum of a 4.5 kg object at a 53° angle?

The formula for calculating the change of momentum of an object is given by Δp = mΔv, where Δp is the change in momentum, m is the mass of the object, and Δv is the change in velocity. In this case, the mass is already given as 4.5 kg, and the angle of 53° can be used to find the change in velocity.

## 2. How do you calculate the magnitude of the change in momentum for a 4.5 kg object at a 53° angle?

To calculate the magnitude of the change in momentum, we can use the formula |Δp| = m|Δv|, where |Δp| is the magnitude of the change in momentum, m is the mass of the object, and |Δv| is the magnitude of the change in velocity. In this case, we can use the given mass of 4.5 kg and the angle of 53° to find the magnitude of the change in velocity.

## 3. How does the angle of impact affect the change in momentum of a 4.5 kg object?

The angle of impact does not change the overall magnitude of the change in momentum for a 4.5 kg object. However, it does affect the direction of the change in momentum. For example, if the object is moving at a 53° angle and experiences a change in momentum, the new momentum will also be at a 53° angle.

## 4. Can the change in momentum of a 4.5 kg object at a 53° angle be negative?

Yes, the change in momentum can be negative if the object experiences a decrease in velocity. This would mean that the object is slowing down in the direction of its motion. However, the magnitude of the change in momentum will always be positive as it is calculated by taking the absolute value of the change in velocity.

## 5. How is the change in momentum related to the force applied to a 4.5 kg object at a 53° angle?

The change in momentum is directly proportional to the net force applied to the object. This means that the greater the force applied, the greater the change in momentum will be. Additionally, the direction of the net force will also determine the direction of the change in momentum.

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