If Sally is pulling a toy car with mass of 20g with a force of 7N, what is the car's acceleration?
To find the car's acceleration, we need to apply Newton's second law of motion. The formula is:
Force (F) = mass (m) × acceleration (a)
In this case, the force acting on the car is 7N and the mass of the car is 20g. However, we need to convert the mass from grams to kilograms since the unit of force is Newtons and the unit of force is kilogram-meters per second squared (kg·m/s^2).
1 kilogram (kg) = 1000 grams (g)
So, we have:
mass (m) = 20g ÷ 1000 = 0.02 kg
Now, we can substitute the values into the formula:
7N = 0.02kg × acceleration (a)
To solve for the acceleration (a), we can rearrange the equation:
acceleration (a) = force (F) ÷ mass (m)
Substituting the known values:
acceleration (a) = 7N ÷ 0.02kg
Now, we can calculate the acceleration:
acceleration (a) = 350 m/s^2
Therefore, the car's acceleration is 350 m/s^2.