Download Newton Review

Newton Review
Use Chapters 1 & 2 in your book to help you find the answers to the questions below.
1. Write Newton’s first law.
Law of Inertia: objects remain in motion, or at rest, until a force acts upon them.
2. Give an example of Newton’s first law using a rocket in your example.
A rocket lifts off until gravity and air resistance stop its upward motion.
3. Write Newton’s second law in equation form.
F = ma
4. What is the force in Newton’s of an object whose mass is 100 kg and accelerates at
5 m/s2?
F = ma; 500 N = 100 kg x 5 m/s2.
5. What is the momentum of an object whose mass is 10 kg and has a velocity of 5 m/s?
momentum = kg x m/s; 50 kg ∙ m/s = 10 kg x 5 m/s
6. Write Newton’s third law.
For every action force there is an equal and opposite reaction force.
7. Give an example of Newton’s third law using a rocket.
Gases expanding are an action force. Rocket lifting is a reaction force.
8. How many kilo Newtons (kN) is 10,000 Newtons?
1 kilo = 1000; 10,000 N/ 1000 = 10 kN
9. What is the mass of an object with momentum 50 kg ∙ m/s and velocity 10 m/s?
momentum = kg ∙m/s; 50 kg ∙ m/s / 10 m/s = 5 kg
10. What is the acceleration of an object with force 500 N with mass 10 kg?
F = ma; 500 N/ 10 kg = 50 m/s2.
11. What is the weight of an object with mass 100 kg being accelerated to Earth at a rate
of 10 m/s2?
F = ma; 100 kg x 10 m/s2 = 1000 N
12. What is the speed of an object that moves 200 feet in 10 seconds?
Speed = Distance/ Time; 20 ft/s = 200 ft/10 s
13. What is the acceleration of an object that goes from 50 m/s to 100 m/s in 10 seconds?
∆ speed/time = acceleration; 100 m/s – 50 m/s / 10 s = 50 m/s / 10 s = 5 m/s2
Fill in the blanks for the following questions below.
14. Air resistance is a kind of _______________ friction. (fluid)
15. One Newton equals _____________. (Kg ∙ m/s2)
16. A _____________ is a push or pull. (force)
17. A ____________________ is any object that orbits another object in space.(satellite)
18. Velocity includes an objects speed and its _________________. (direction)
19. When a change in motion occurs forces are said to be __________. (unbalanced)