Which statement most completely describes an object's motion?
Responses
A car travels 25 miles.
A car travels 25 miles.
A marble rolls 10 m to the left.
A marble rolls 10 m to the left.
The baby crawls 10 feet in 15 seconds toward the door.
The baby crawls 10 feet in 15 seconds toward the door.
The rain falls at a rate of one inch per hour.
The baby crawls 10 feet in 15 seconds toward the door.
Which pieces of information are necessary to describe an object's motion?
Responses
position and direction
position and direction,
position, direction, and speed
position, direction, and speed
position and speed
position and speed,
direction and speed
direction and speed,
position, direction, and speed
Which statement is a scientifically accurate description of velocity?
Responses
The golf pro missed the shot even though the ball was only one meter away from the cup.
The golf pro missed the shot even though the ball was only one meter away from the cup.
The skier traveled downhill along the 80-meter track to the finish line in just 3.5 seconds to win the competition.
The skier traveled downhill along the 80-meter track to the finish line in just 3.5 seconds to win the competition.
After traveling at 120 kph for the entire 30-minute race, the racecar driver ended the race at the same point she started.
After traveling at 120 kph for the entire 30-minute race, the racecar driver ended the race at the same point she started.
With just two second left on the clock, the basketball player moved quickly down the court to sink the ball in the basket.
The skier traveled downhill along the 80-meter track to the finish line in just 3.5 seconds to win the competition.
A car traveled at an average speed of 60 mph for two hours.
How far did it travel?
Responses
30 miles
30 miles
60 miles
60 miles
120 miles
120 miles
150 miles
The car traveled for two hours at an average speed of 60 mph, so it traveled 120 miles.
A cyclist rode at an average speed of 10 mph for 15 miles.
How long was the ride?
Responses
1.5 hours
1.5 hours
10 hours
10 hours
15 hours
15 hours
150 hours
150 hours
The cyclist rode at an average speed of 10 mph for 15 miles, so the ride took 1.5 hours.
Amy gets up from her seat on a train to move closer to the front. Just as she begins to walk forward, the train stops at a station.
What is the best explanation of what happens to Amy?
Responses
While Amy is walking, her body is in motion, but as the train stops, it exerts a force on Amy opposite to the direction she is walking, causing her to stop as well.
While Amy is walking, her body is in motion, but as the train stops, it exerts a force on Amy opposite to the direction she is walking, causing her to stop as well.
While Amy is walking, her body is in motion. When the train stops, because she's not buckled in, Amy continues to move forward due to inertia.
While Amy is walking, her body is in motion. When the train stops, because she's not buckled in, Amy continues to move forward due to inertia.
While Amy is walking, her body is in motion. When the train stops, an unbalanced force accelerates her body backward.
While Amy is walking, her body is in motion. When the train stops, an unbalanced force accelerates her body backward.
While Amy is walking, she is in motion due to the force of repulsion. When the train stops, she is catapulted forward due to the train's stronger force of attraction.
While Amy is walking, she is in motion due to the force of repulsion. When the train stops, she is catapulted forward due to the train's stronger force of attraction.
While Amy is walking, her body is in motion. When the train stops, because she's not buckled in, Amy continues to move forward due to inertia.
Which characteristic does inertia describe?
Responses
how large an object is
how large an object is
how fast an object is moving
how fast an object is moving
how difficult it is to change an object's motion
how difficult it is to change an object's motion
how long an object is
how long an object is
how difficult it is to change an object's motion
What is the best description of the acceleration of an object?
Responses
A car's velocity changes from 25 m/s to 20 m/s in 5 seconds.
A car's velocity changes from 25 m/s to 20 m/s in 5 seconds.
A remote-control car speeds up from 0 m/s to 15 m/s.
A remote-control car speeds up from 0 m/s to 15 m/s.
An airplane changes elevation from 10,000 ft to 5,000 ft.
An airplane changes elevation from 10,000 ft to 5,000 ft.
A runner travels 100 m in one minute.
A runner travels 100 m in one minute.
A remote-control car speeds up from 0 m/s to 15 m/s.
A rock falls off a cliff and hits the ground after three seconds. The rock's velocity is 29.4 m/s when it hits the ground.
What is its acceleration of the rock in the downward direction?
Responses
0.31 ms2
0.31 m per s squared,
3 ms2
3 m per s squared,
9.8 ms2
9.8 m per s squared,
88.2 ms2
88.2 m per s squared,