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 tiny pebble and a boulder in your
example.
The tiny pebble is easy to change its state of motion due to its low mass while the
boulder, having more mass is much harder to change its state of 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 acceleration of an object of 100 N that has a mass of 5 kg?
100N/5kg = 20 m/s2
6. What is matter? What is mass? What is volume? What is the volume of a box of the
following dimensions: length = 2m, w=2m, ht = 3m.
The name for what has mass and volume, how much matter an object is make up of
(remember that although mass and weight are related, they are NOT the same thing),
area occupied by matter, 12m3
7. Explain how inertia and gravity keep the Moon orbiting the Earth.
Due to inertia the
Moon will continue in a straight line motion, however the greater gravity of the Earth
causes space to warp and the Moon must travel that warped path though space around the
Earth.
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 force 20 N and acceleration 10 m/s2?
20N/10 m/s2 = 2 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.
15. One Newton equals _____________. (1 Kg ∙ 1 m/s)
16. A _____________ is a push or pull. (force)
17. m x m x m = ________. m3
18. Velocity includes an objects speed and its _________________. (direction)