Motion: Reference Point and Speed

What is a reference point?

• A moving object used to determine if another object is moving.

• A stationary object used to determine if another object is moving.

• Any object used to determine speed.

• An object that changes its position over time.

In the first scenario with the kid on the bike and the trees, is the kid moving if the trees are used as reference points?

• Yes, because the bike wheels are spinning.

• No, because the distance between the kid and the trees is not changing.

• Yes, because the kid is on a bike.

• No, because the trees are stationary.

In the second scenario with the kid on the bike and the trees, is the kid moving if the trees are used as reference points?

• No, because the trees are stationary.

• Yes, because the kid is pedaling the bike.

• Yes, because there is a change in distance between the kid and the trees.

• No, because the kid is still on the bike.

How is speed calculated?

• Time divided by distance (t/d).

• Distance multiplied by time (d*t).

• Distance divided by time (d/t).

• Speed cannot be calculated without a reference point.

A snail moves 1 meter in 30 seconds. What is its speed?

• 30 m/s

• 1 m/s

• 0.03 m/s

• 3 m/s