Force motion Unit 3

Which of the following is the best example of motion?

• Water molecules freezing and becoming a solid.

• A bug crawling across the floor for 3 minutes looking for breadcrumbs.

• Samantha singing in a thirty-minute choir practice in the same spot

• Water molecules moving around inside a glass

Answer explanation

We can define motion as the change of position of an object with respect to time. A book falling off a table, water flowing from the tap, rattling windows

What is the formula to calculate speed?

• S = t/d
• S = d/t
• S = d x t
• S = t x d

A runner races in the 100 meter dash. It takes her 10 seconds to finish. What is her average speed?

• 10 m/s

• 1000 m/s

• 100 seconds

• 10 seconds

What is the speed of a bus that travels 250 km in 2 hours?

Formula ?

Answer ?

• S= D/T

  125km/hr

• S= T/D

  521km/meters

• S=D/T Km/hr

• All fo the above

Motion is

• a word that rhymes with ocean.

• an object's change in its speed to a reference point.

• an object's change in position to a reference point.

• an object's change in position to its rate of speed.

David walks 3 km north, and then turns east and walks 4 km. What is the distance?

• 7 km
• 3 km
• 4 km
• 1 km

Bill runs 400 meters to Andy's house, turns around, and runs 400 meters back home.  What is Bill's displacement?

• 0 meters
• 400 meters
• 800 meters
• 1600 meters

Jerry walked from home to school, then from the school to the park. What is his total distance?

• 2 km

• 5 km

• 8 km

• 10 km

Jerry walked from home to school, then from the school to the park. What is his total displacement?

• 2 km

• 5 km

• 8 km

• 10 km

After completing one trip on a roller coaster, the roller coaster's ________ is zero.

• displacement
• reference point
• length
• distance