A model rocket has a mass of 0.2 kg, with a motor that can provide a force of 100 N. A second model rocket is being built with the same motor, but it is being designed to accelerate half as much as the first rocket. What kind of change can be made in the design to achieve this objective? (1 point)
Responses
The mass of the second rocket should be 0.2 kg.
The mass of the second rocket should be 0.2 kg.
The mass of the second rocket should be 0.4 kg.
The mass of the second rocket should be 0.4 kg.
The mass of the second rocket should be 0.1 kg.
The mass of the second rocket should be 0.1 kg.
The mass of the second rocket should be 0.01 kg.
The mass of the second rocket should be 0.01 kg.
The correct response is: The mass of the second rocket should be 0.4 kg.
Five motorboats are being tested to see which reaches the highest velocity in the same amount of time. After graphing the acceleration versus force for each motorboat, the graph is a sloped line with a y-intercept of zero. Which statement is correct about these motorboats?(1 point)
Responses
All five motorboats have the same mass, which cannot be calculated from the graph.
All five motorboats have the same mass, which cannot be calculated from the graph.
All five motorboats have the same mass, which can be calculated from the graph.
All five motorboats have the same mass, which can be calculated from the graph.
All five motorboats have the same final velocity, which can be calculated from the graph.
All five motorboats have the same final velocity, which can be calculated from the graph.
All five motorboats have the same final velocity, which cannot be calculated from the graph.
The correct response is: All five motorboats have the same mass, which cannot be calculated from the graph.
If a soccer ball’s mass is 5 kg and a player who weighs 50 kg kicks the soccer ball forward with a force of 5 N , how much force does the ball exert on the player’s foot and in what direction?(1 point)
Responses
10 kg/N backward
10 kg/N backward
5 N backward
5 N backward
100 kg forward
100 kg forward
5 N forward
The correct response is: 5 N forward.
A toy helicopter flies forward with a force of 15 N into an oncoming wind of 10 N. The force of gravity pulls the helicopter down with a force of 5 N, but the propeller is providing an upward force of 10 N.
Which of the following accurately describes the helicopter’s force?
(1 point)
Responses
The toy helicopter is flying forward with a force of 15 N.
The toy helicopter is flying forward with a force of 15 N.
The toy helicopter is flying forward with a force of 10 N and upward with a force of 5 N.
The toy helicopter is flying forward with a force of 10 N and upward with a force of 5 N.
The toy helicopter is flying forward with a force of 15 N and upward with a force of 10 N.
The toy helicopter is flying forward with a force of 15 N and upward with a force of 10 N.
The toy helicopter is flying forward with a force of 5 N and upward with a force of 5 N.