Question

cca 2 retest
a teacher leaves a coffee mug on top of a car, as shown in the diagram below.
the teacher drives the car in a straight line and then stops suddenly. what happens to the coffee mug when the car stops?
a the mug moves backward.
b the mug stays in the same position.
c the mug moves forward.
d the mug moves side to side.

Explanation:

According to Newton's first - law of motion (law of inertia), an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force. When the car is moving, the coffee mug is also moving with the car. When the car stops suddenly, the mug, due to its inertia, wants to continue moving forward.

Answer:

C. The mug moves forward.