Describing Motion and Force
1. What is inertia?
B: The tendency of an object to resist changes in its state of motion
The distance an object moves per unit of time.
What is Newton's first law of motion?
An object at rest will remain at rest unless acted upon by a force.
The amount of matter something has
What is mass
13. True/False: Drag, air resistance, and friction are all forces that work to oppose the motion of an object.
True
A push or a pull
A force
The speed at which an oject travels in a given direction
What is velocity?
What is Newton's second law of motion?
An ojects mass directly affects how much force is needed to accelerate the object.
When an object moves through the air, often called air resistance, is what type of friction?
Fluid Friction
14. Two teams are playing Tug of War and are both using the same amount of force. This is an example of _______.
Balanced forces.
The combination of all forces acting on an object
The net force
Nicki rides her bike at a constant speed for 65 meters. That part of her ride takes her 10 sec. What is her average speed and is this a vector?
6.5 m/s - no, it does not have direction
What is Newton's third law of motion?
The law that states that the force of gravity acts between all objects in the universe that have mass.
Universal Gravitation
increase force, decrease mass
Give an example of NON-contact forces
gravity, magnetism, electricity
12. Which of Newton's Laws states that "every action has an equal and opposite reaction?" (like the ball thrown at a wall & bouncing back)
C: 3rd law of motion
Forces between objects come in pairs.
What are action-reaction forces
What is kinetic energy?
The energy of motion
3. How is a theory different from a law in science?
A: A theory explains something based on strong evidence, while a law describes what happens based on repeated experiments.
Calculated the net force and direction
2N > < 6n
4N to the left
A student graphed distance versus time for a beetle that moves 10m every 5s. What is the speed of the beetle.
2m/2
Why don't objects in motion continue moving forever?
Even if nothing appears to stop a moving object, forces such as friction, air resistance and gravity are all acting on the object to slow it down.
2. If the forces acting on an object are balanced, what will the motion/acceleration be?
C: The object will remain at rest or move at a constant speed (no motion)
9. If a book rests on the table, which force acts opposite to the force of gravity? (perpendicular to the surface of the table)
C: Normal force