Relative Motion

Front

Observers using different ___________________ may measure different velocities for an object in motion

Back

frame of reference

Front

If a car passes you in the left lane going 90 km/hr north while you are driving 80 km/hr north, how fast is the car moving relative to your car?

Back

10 km/hr

Front

A woman on a bicycle travels at 9 m/s relative to the ground as she passes a little boy on a tricycle going in the opposite direction. If the boy is traveling at 1 m/s relative to the ground, how fast does the boy appear to be moving relative to the woman?

Back

10 m/s

Front

What is the walker's speed from the observer's perspective?

Back

30 mph

Front

What is the walker's speed with respect to the train?

Back

10 mph

Front

For us humans, what is our basic reference frame? Options: Earth, The Sun, The Universe, The Milky Way Galaxy

Back

Earth

Front

Relative

Back

Relative means in comparison of something else

Front

A dog and a cat are about to fight, running towards each other, both at 12 m/s. What are their velocities relative to each other?

Back

24 m/s

Front

A passenger at the rear of a train traveling at 15 m/s relative to the ground throws a baseball with a speed of 15 m/s in the direction opposite the motion of the train. What is the velocity of the baseball relative to the ground as it leaves the thrower’s hand?

Back

0 m/s

Front

A boat heading north crosses a wide river with a velocity of 10.00 km/h relative to the water. The river has a uniform velocity of 5.00 km/h due east. Determine the boat’s speed with respect to an observer on shore.

Back

11.18 km/hr