Download Newton`s Laws

Intro to Physics
Homework
Name_______________
Date_________Hour___
Newton’s Laws
1. Describe Newton’s 1 Law. Give an example that relates to Newton’s 1st Law.
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2. What equation summarizes Newton’s 2nd Law? Give the units used to measure each
variable of the equation.
3. Calculate the force needed to accelerate a 0.15 kg hardball at 3 m/s2.
4. What is the acceleration of a 0.5 kg soccer ball kicked with 50 N of force?
5. What is the mass of an object that is pulled with a force of 25 N with an acceleration of
5 m/s2?
6. A 60 kg person on earth travels to a large planet that has a gravitational pull twice that of
earth.
A. What is weight of this person on earth?
B. What is the mass of this person on the large planet?
C. What is the weight of this person on the large planet?
7. Two horizontal forces, 225 N and 165 N, are exerted in the same direction on a crate.
A. Find the total horizontal force on the crate.
B. Find the net horizontal force if the two forces are opposite each other. Indicate the
direction too.
8.
What is the derived unit of 1 Newton?
9. If you are in a car that is struck from behind, you can receive a serious neck injury called
whiplash.
A. Using all three of Newton’s Laws of motion explain what happens to cause this injury.
B. How does a headrest reduce whiplash?
10. A ball is hit hard against a concrete wall. Use Newton’s third law of motion to explain
what happens and why?