Question

Which of the following surfaces would have the lowest amount of friction?

a
Glass
b
Sand
c
Wood
d
Ice
Question 9
A car engine provides 2500 N of force for a car that has a mass 1000 kg. If an engineer develops a new chassis for a car that is half as massive, what is the acceleration of the car with the new chassis?

a
2.5 m/s^2
b
5 m/s^2
c
8 m/s^2
d
1.3 m/s^2

Answer 1

For the first question regarding which surface would have the lowest amount of friction, the answer is:

**d. Ice**

Ice generally has a lower coefficient of friction compared to glass, sand, and wood.

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For the second question about the acceleration of the car with the new chassis, we can use Newton's second law, which states:

\[ F = m \cdot a \]

Where:
- \( F \) is the force (2500 N)
- \( m \) is the mass
- \( a \) is the acceleration

Since the new chassis is half as massive as the original 1000 kg car, the new mass \( m \) is:

\[ m = \frac{1000 \, \text{kg}}{2} = 500 \, \text{kg} \]

Now substituting the values into the equation:

\[ 2500 \, \text{N} = 500 \, \text{kg} \cdot a \]

Now, solving for \( a \):

\[ a = \frac{2500 \, \text{N}}{500 \, \text{kg}} = 5 \, \text{m/s}^2 \]

So the answer is:

**b. 5 m/s²**