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Name _______________________________________ Hr _____
Use you notes to help you answer the following questions
1. The tendency of an object to keep moving, or an object at rest to stay at rest is called __________________
2. State Newton's First Law of Motion:
3. If the first law is true, when you get an object moving on earth, why does it stop? ____________________
4. When your car hits the brakes, why do you fly forward? ________________________________________
5. What is Newton’s Second Law?
6. Which car would move the fastest? (Both have the same engine)
a. a 200 kg car
b. a 3000 kg car
c. both the same
7. Which car would accelerate the fastest?
a. a 2000 kg car with an engine that puts out a force of 500 N
b. a 2000 kg car with an engine that puts out a force of 600 N
c. both would accelerate at the same rate
8. What is Newton’s Third Law?
9. What are the two forces in the law called? ____________________________________________________
10. How much force is needed if a 160 kg wrestler is inside a car that is accelerating at 3 m/s2?
11. A 63 kg skater pushed off from a wall with a force of 300N. What is the skater’s acceleration?
12. Which hits the ground first when they are dropped?
a. a 1 pound steel ball
b. a 5 pound steel ball
c. both hit at the same time
13. A feather and a steel ball
a. Why doesn’t a feather hit the ground at the same time as a steel ball? ________________________
b. Where would it hit at the same time? __________________________________________________
14. What is terminal velocity?_________________________________________________________________
15. Which would hit the ground first? (Both are released at the same time)
a. a bullet fired horizontally to the ground
b. a bullet dropped to the ground
c. both would hit at the same time
16. You are shooting at a monkey in a tree. The monkey will jump down just as you shoot the gun. Where
should you aim?
a. at the monkey
b. below the monkey
c. above the monkey
Newton’s Three Laws
Part I. Write the number of the law that best fits each situation.
1.______
Faster peddling accelerates a bicycle more than slower peddling.
2.______
A moving car coasts for long distances.
3.______
An airplane moves in an opposite direction to the blast of its jet.
4.______
A rock stays in one place unless it is moved.
5.______
More force is needed to accelerate a large mass car than a small mass car.
6.______
Water shooting out of a garden hose causes the hose to fly backwards.
7.______
Satellites move around the earth for many years.
8.______
A boat moves forward as the paddles move backward.
Part II. Use Newton's three laws to answer the following questions. Tell which law explains each one.
1. Explain the launching of a rocket.
2. Explain why a satellite moves around the earth without any force pushing it
3. Explain why engines with equal power accelerate cars with a small mass quicker than cars with a large mass.
4. a. Give the equation for Newton's second law. ___________________________________________
b. Calculate the force needed to accelerate a 12 kg bicycle by 2 m/s2.
c. Calculate the force needed to accelerate an 1800 kg car by 4 m/s2.