# Why is it easy to get one empty cart moving but difficult to get a line of 20 empty carts moving?

**Why is it easy to get one empty cart moving but difficult to get a line of 20 empty carts moving**?

**One empty cart**has less mass than

**20 empty carts**so there is less inertia, therefore less force required

**getting**them to

**move**. A bowling ball has a mass of 6 kilograms. A tennis ball has a mass of 0.06 kilogram.

Also question is, why does it take more force to accelerate a full grocery cart than an empty one?

The law describes that the less mass an object **has**, the greater the acceleration. This **can** be related to the **shopping carts**. If a person pushes two **carts**, **one empty** and **one full** of **groceries**, with the same **force**, the **empty cart will** travel farther and **accelerate more** compared to the **full cart**.

**bowling ball**, so we say that the

**bowling ball**has a higher inertia than the

**tennis ball**. A classic demonstration of inertia is as follows. inertia. The amount of inertia depends on how much stuff (or matter) is inside an object.

Keeping this in view, how will the same amount of force affect a tennis ball and a bowling ball differently?

On the other hand, and to answer your question, if you apply the **same force** to both **balls**, then it follows that the **tennis ball would** accelerate faster than the **bowling ball** because it has a smaller mass than the **bowling ball**.

Thus it will fall faster than a less massive object. Galileo accounted for the **inertia** of falling objects. So although the lead ball would be heavier than a wooden ball of the same size, it would also have **more inertia**. One argument against Galileo was what one could plainly see when one drops a **hammer** and a **feather**.