Frame of Reference and Motion
A person sitting on a moving Ferris wheel is stationary relative to their seat, but moving relative to this ground-level object.
What is a person standing on the ground (or the ticket booth/ground)
When two forces acting on an object are equal in size but opposite in direction, the net force is this value.
What is 0 N?
According to the Law of Universal Gravitation, these two factors determine the strength of gravity between any two objects
What are mass and distance?
This term refers to an object’s resistance to any change in its state of motion
What is inertia?
A car turning a tight corner at a steady speed of 20 mph is still undergoing this physics process because its direction is changing.
What is acceleration?
This term describes a location or object used to determine whether something is in motion.
What is a reference point?
This type of friction is what keeps a parked car from sliding down a steep driveway.
What is static friction?
This property of an object measures how much matter it contains and never changes when traveling to another planet.
What is mass?
A person steps out of a canoe onto a dock, causing the canoe to push backward away from the dock. This is a classic example of this Newton's Law.
What is Newton's Third Law?
If you push a shopping cart with a force of 50 N to the right, this is the force the shopping cart exerts back on your hands.
What is 50 N to the left?
A passenger on an airplane drops a peanut into their hand. To another passenger on the plane, the peanut moves straight down. To a person on the ground, the peanut is moving in this main cardinal direction.
What is forward (or the direction the plane is flying)
Two dogs pull on a rope toy. Dog A pulls left with 45 N, and Dog B pulls right with 60 N. This is the magnitude and direction of the net force.
What is 15 N to the right?
On Earth, weight is measured in these force units rather than kilograms.
What are Newtons (or pounds)?
Using the formula F=m⋅a, if you double the force applied to an object without changing its mass, the acceleration does this.
What is doubles?
A heavy bowling ball and a light tennis ball are rolled down a hallway with the same force. The tennis ball accelerates faster because it has less of this.
What is mass (or inertia)?
A bus travels 30 miles in 0.5 hours, stops for 0.5 hours, and then travels 30 miles in 1 hour. This is the bus's average speed for the entire trip.
What is 30 mph? (2 hours60 miles)
An oil spill on a bowling alley lane reduces this specific type of friction between the bowling ball and the floor.
What is rolling friction?
If Jupiter has much more mass than Earth, your mass on Jupiter would stay the same, but your weight would do this.
What is increase?
A soccer ball sits motionless on the grass until a player kicks it. This demonstrates which of Newton's Laws?
What is Newton's First Law?
An ice puck glides across smooth ice for a long time before stopping. The external force primarily responsible for slowing it down is this.
What is sliding friction?
Saying a motorboat travels at 15 knots is a measure of speed, but saying it travels 15 knots Northwest is a measure of this.
What is velocity?
A sky diver reaches terminal velocity when the downward force of gravity equals this upward friction force.
What is fluid friction (or air resistance)?
True or False: Gravitational pull only exists between planets and large celestial bodies, not between everyday items like a pencil and a textbook.
What is False (all objects with mass attract each other)?
Calculate the force required to accelerate a 2-kg toy car at a rate of 5 m/s^2?
What is 10 N (F=2×5)?
Swimming in water is an example of this kind of friction.
What is fluid friction?