Which of the following scenarios provide evidence for Newton’s second law of motion? Select all that apply.
a.The force of gravity is stronger on an object with more mass to cause the same acceleration.
b.The friction of ice causes a hockey puck to come to a stop.
c.A group of balanced forces on a table cause it to remain at rest.
d.Pushing a full wheelbarrow is harder than pushing an empty wheelbarrow.
All day at work, Cara’s mom s people settle serious conflicts without going to court or resorting to violence. What is Cara’s mom’s area of expertise?
Impacts from objects hitting the moon and simulations of objects hitting the moon can show a lot of similarities and differences. However, the one main difference that can be considered is which of the following.
A) only the simulation can show natural craters
B) only the moon can have small and large debris strike it
C) the speed from simulated debris fall much slower than real debris hitting the moon
D) both can show ejecta and rays
Which feature must a community have in order to use wind energy?
A. An average elevation change of 20 feet per mile to allow the wind
to flow downhill
B. Molten rock near groundwater supplies
C. Nets to keep birds and bats away from the turbines
D. An average wind speed of at least 15 miles per hour and enough
land to build several wind turbines
What are three ways a driver can cause a car to accelerate?
A. Turn the key in the ignition while the car is stopped.
B. Turn the steering wheel while the car is moving.
C. Press the gas pedal while the car is stopped.
D. Press the brake pedal while the car is moving.
Mass/energy equivalence is expressed mathematically in which of the following expressions?
c. E= 1/2 mv^2
How do forces act on a dropped object as it is falling?
A. air resistance is pushing up on the object, while gravity is pulling it down.
B. Air resistance is pulling down on the object, while gravity is pushing it up.
C. Both gravity and air resistance are pulling down on the object.
D. Both gravity and air resistance are pushing up on the object.