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

Question

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