Calculations
A car travelled _______ meters in 25 seconds moving at a speed of 12 m/s.
300 m
It takes 30 Newtons for a duck to fly upwards. The duck experiences a _______ net force, because gravity is acting on it a 20 Newton force.
10 Newton net force (the duck is flying Up and gravity is pulling down therefore the directions of the forces on the duck are opposite --> subtraction)
This law of motion defines how all forces acting on an object either keep it in place or cause it to move
Newton's 1st law of motion
what the 3 parts in a scientific explanation
Claim, evidence, and reasoning
This is the force that opposes motion between two surfaces that are touching.
Friction
An object is dropped from a height of 58.8 meters and hits the ground after 3 seconds. What was the velocity of the object when it hit the ground?
19.6 m/s
Stream A and stream B both flow down a mountain to merge into a river that continues to flow down the mountain. If stream A flows at 14 newtons and stream B flows at 4 newtons, what is the net force when both streams merge?
18 Newtons (Both stream a and B are flowing "down" since they have the same direction both forces and added to get the net force)
The law of motion describes why a rubber bands snap back their original shape with the same force used to to stretch it.
Newton's 2nd law of motion
How would you score the following student's scientific explanation (Question from the review sheet): "Is the subway platform moving:"
The platform is not moving because it is made out of concrete and concrete cannot move.
2, they have a claim and reasoning but they provide no evidence (observation) from the picture.
______ is the tendency of an object to resist a change in its motion.
Inertia
What is the force felt on the ground when a golf ball that has a mass of 0.05 kg is hit and accelerates at 50 m/s2?
2.5 Newtons
What is the acceleration of a a baseball that is thrown by a pitcher with 22.5 newtons of force, if the baseball has a mass of 0.15 kg?
150 m/s2
This law of motion details the relationship between force, acceleration, and mass.
Newton's 2nd law of motion
How would you score the following student's scientific explanation (Question from the review sheet): "Is the subway platform moving:"
No, because the train is moving and that why in the picture you see the platform blurry.
1, "No" is not a claim needs to be a complete sentence. also there is no reasoning presented, only an observation (evidence).
A measure of magnitude and NOT direction
Scalar