Investigate and describe applications of Newton's three laws of motion such as in vehicle restraints, sports activities, amusement park rides, Earth's tectonic activities, and rocket launches.
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Q 1/10
Score 0
A leaf fell from a tree branch. The path it followed is shown in the diagram. Which of these best describes why the leaf fell in a crooked path instead of straight down?
30
Objects with irregular shapes never fall in straight lines.
Air currents and gravity applied changing and unbalanced forces to the leaf.
The upward force of the air on the leaf was greater than the downward force of gravity.
Once the leaf was in motion, it continued moving in the same direction because the forces were balanced.
Q 2/10
Score 0
The diagram shows a homemade car being pushed with a force of 25 N. The force causes the car to move at a constant speed of 3 m/s. What will happen if the force is changed to 35 N?
30
The car will move at a constant speed of 13 m/s.
The speed of the car will increase.
The speed of the car will decrease to 1 m/s.
The speed of the car will not change.
10 questions
Q.
A leaf fell from a tree branch. The path it followed is shown in the diagram. Which of these best describes why the leaf fell in a crooked path instead of straight down?
1
30 sec
8.6a
Q.
The diagram shows a homemade car being pushed with a force of 25 N. The force causes the car to move at a constant speed of 3 m/s. What will happen if the force is changed to 35 N?
2
30 sec
8.6a
Q.
Two students are working together to build a birdhouse. Student 1 applies a force of 10 N to a wooden board in order to slide it across the table to Student 2. If the force of friction resisting the student’s push is 4 N, what is the net force acting on the board?
3
30 sec
8.6a
Q.
The three vehicles shown are all traveling at a speed of 15 m/s, but only the pickup truck has a changing velocity. The pickup truck has a changing velocity because the pickup truck —
4
30 sec
8.6b
Q.
Which of the following best describes the velocity of an object?
5
30 sec
8.6b
Q.
A student graphed the position of a cart during a 7-second time interval. Which statement best describes the cart?
6
30 sec
8.6b
Q.
Two cars with different masses travel at the same speed down a hill toward a stop sign. What will happen when both cars apply brakes at the same time to stop?
7
30 sec
8.6c
Q.
Sometimes tectonic plates do not move easily past one another, and the plates become stuck. Forces build up, and when the plates finally move, tension is released, as shown below. The sudden movement of the plates is caused by —
8
30 sec
8.6c
Q.
During a demonstration of Newton’s laws of motion, a student used the setup shown in Figure 1. The student flicked the index card with a fingertip, and the coin fell straight down into a plastic cup as shown in Figure 2. Which of these best explains why the coin fell straight down into the cup instead of remaining on the index card?
9
30 sec
8.6c
Q.
A student jumps off a sled toward the west after it stops at the bottom of an icy hill. Based on the law of action–reaction, in what direction will the sled most likely move as the student jumps off?
