Mass stays the same, but weight changes due to location because gravity changes.
100
16. Why does a bus have a large momentum even if it is moving slow?
It has a large mass.
100
21. Compare and contrast electric forces with magnetic forces.
With both electric and magnetic forces, like charges repel and opposite charges attract. Electric forces act between charge objects, while magnetic forces act on certain metals.
200
2. What is the SI unit for measuring force? What is it equivalent to?
Newtons (N), 1 N = 1 kg m/s2
200
7. Which direction does friction act?
Opposite of the applied force
200
12. Why will a person's weight be less on the moon than on the Earth?
The moon has a smaller g value because it has a smaller mass than Earth
200
17. Explain why a bullet has a large momentum if it moving fast.
It has a high velocity.
200
22. What does gravitational force depend on?
Mass and distance.
300
3. What is the net force?
The overall force acting on an object after all forces are combined
300
8. What is an example of projectile motion?
Soccer ball being kicked, football being thrown, shooting basketballs
300
13. What are action and reaction forces?
Equal and opposite forces acting on an object
300
18. What is an object's momentum if it is at rest?
Zero!
300
23. Gravity is the weakest universal force, but effective over long distances. What is ONE example that shows this?
Gravity holds us to Earth's surface. Gravity keeps Earth in orbit around the sun. Gravity keeps the moon in orbit around Earth.
400
4. When the net force is zero, what can this be referred to?
Balanced forces
400
9. What other name is Newton's First Law called by?
The Law of Inertia
400
14. Explain Newton's Third Law.
For every action there is an equal and opposite reaction.
400
19. What happens when two objects collide in a closed system?
Momentum is conserved (it doesn't change).
400
24. While pushing a box across a shelf, these two friction forces are at work.
What is static and sliding?
500
5. What happens when an unbalanced force acts on an object?
The object will move or accelerate.
500
10. Explain Newton's First and Second Laws.
1st Law: An object in motion stays in motion, an object at rest stays at rest unless acted on by an outside force. 2nd Law: F = ma
500
15. What is momentum, how do you calculate it, and what are the units?
Momentum is a quality of a moving object and is the product of the object's mass and velocity. p = mv; kg m/s
500
20. What are the THREE universal forces?
Electromagnetic forces (electric forces and magnetic forces), nuclear forces, gravitational forces.