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Motion, Force & Energy
Terms in this set (24)
A change in position with respect to a reference point is
You do not know an object's velocity until you know its
speed and direction
If you know a car travels 30 km in 20 minutes, you can find its
The parts of Earth's outer layer that move are called
The rate at which velocity changes is called
The distance an object travels per unit of time is called
The basic SI unit of length is the
The ___________________________explains how Earth's landmasses have changed position over time.
theory of plate tectonics
The _____________________ of a speed-versus-time graph represents acceleration.
Both ________________ and acceleration include the direction of an object's motion
A passenger walks toward the rear of a moving train. Describe her motion as seen from a reference point on the train. Then describe it from a reference point on the ground
The passenger would appear to be moving backward from a reference point on the train. From the ground she would appear to be moving forward, because the train moves forward faster then she is walking backward
Which has a greater speed, a heron that travels 600 m in 60 seconds or a duck that travels 60 m in 5 seconds? Explain
The duck at 12m/s has a greater speed than the heron which travels at 10m/s
You have a motion graph for an object that shows distance and time. How does the slope of the graph relate to the object's speed?
It relates to the object's speed per 1 unit of time. The slope depends on the changes in the speed per unit of time. Constant speed straight line. Acceleration curved line.
How can you tell if an object is moving when its motion is too slow to see?
Align the object with a reference point That is not moving; check the objects position relative to the reference point at different times to see if it has changed
An insect lands on a compact disc that is put into a player. If the insect spins with the disc, is the insect accelerating? Why or why not?
The insect is accelerating because the direction of its motion is always changing.
The graph below shows the motion of a remote-control car. During which segment is the car moving the fastest? The slowest? How do you know?
Segment A is moving the fastest, Segment B is the slowest because it is not in motion. The reason segment A is the fastest because the steeper the slope the faster it is and vice versa.
Two drivers make a 100-km trip. Driver 1 completes the trip in 2 hours. Driver 2 takes 3 hours but stops for an hour halfway. Which driver had a greater average speed? Explain.
Driver 1 he was driving at an average speed of 50km/hr, while the driver 2 was driving at an average speed of 33km/hr. Driver 1 had a greater average speed.
A family takes a car trip. They travel for an hour at 80 km/h and then for 2 hours at 40 km/h. Find their average speed during the trip.Hint
Convert 119 cm to meters
Convert 22.4 km to meters
During a slap shot, a hockey puck takes 0.5 second to reach the goal. It started from rest and reached a final speed of 35 m/s. What is the puck's average acceleration?
Measure the distance from the starting line to line B, and from line B to the finish line. Measure to the nearest tenth of a centimeter.
ine A----->line B= 2cm
line B----->line C (finish)+ 5cml
Starting at rest, the ladybug accelerated to line B and then moved at a constant speed until it reached the finish line. If the ladybug took 2.5 seconds to move from line B to the finish line, calculate its constant speed during that time.
2.0 CM/S (5.0 CM/2.5 S)
The speed you calculated in Question 21 is also the speed the ladybug had at the end of its acceleration at line B. If it took 2 seconds for the ladybug to accelerate from the start line to line B, what is its average acceleration during that time?
1.0 CM/S (2.0cm/s/2 s))
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