**Chapter 12 – Quiz Questions #1 - #7**

pp. 397 - 425

**Newton****’s 1 ^{st} Law – Chapter 12 – Quiz Questions #1**

pp. 397 - 398

- State and give an example of Newton’s first law of motion.

- Explain the concept of “net force.”

- Define the word “inertia.”

- How is inertia related to mass?

- A magician pulls a table cloth out from underneath a set of dishes without moving or breading the dishes. Using Newton’s 1
^{st}law, explain how this is possible.

- When you are a rider in a car and the driver makes a sharp turn, you appear to slide towards the side of the car. Use Newton’s 1
^{st}law to explain why you slide towards the door.

- Why are babies placed in backwards-facing car seats?

- Why do passengers wear seat belts in cars?

- A bowling ball in motion tends to remain in motion unless acted on by an outside force. Why is it difficult to start a bowling ball moving?

- You are in an airplane cruising at 500 km/hr. You jump straight up in the aisle of the airplane. Where do you land and why?

- You are in an automobile cruising at 35 miles/hr. You toss a tennis ball up in the air. Where does it land and why?

- Explain how Newton’s 1
^{st}Law is responsible for space travel.

**Newton****’s 2 ^{nd} Law – Chapter 12 – Quiz Questions #2**

pp. 400 - 402

- State and give an example of Newton’s second Law of Motion.

- From the picture of the football players on page 400, explain why the two players in the picture on the right get less acceleration.

- What is the formula for force?

- What is the unit of measurement for force?

- What are balanced forces?

- What are unbalanced forces?

- Describe Newton’s 2
^{nd}Law in terms of acceleration.

- Why does a small sports car have better acceleration than an 18-wheel truck?

- Why does a small car have better fuel economy than a large SUV?

- Explain how Newton’s 2
^{nd}Law is responsible for space travel.

**Gravity – Chapter 12 – Quiz Questions #3**

pp. 403 - 406

- How are weight and mass related?

- What is “weight?”

- How do you calculate “weight” on the moon?

- What is the unit of measurement for “weight?”

- What is the difference between “mass” and “weight?”

- Using the table on page 404 and the paragraph beside it, calculate the weight of a 66kg person on a) Earth, b) Venus, c) Mars, d) Neptune, and e) the moon.

- What is the Law of Universal Gravitation?

- Why can you feel the presence of gravity between you and the Earth, but not between you and a pencil?

- Gravity is dependent on two factors. What are they?

- As the distance between two objects decreases, the force of gravity between them ……

- What happens to the gravitational force between two objects if their masses do not change but the distance between them becomes 4 times as much?

- The weight of an object varies with the ______________________________.

**Free Fall & Projectile Motion – Chapter 12 – Quiz Questions #4**

pp. 407 - 410

- What is “free fall?”

- What is “terminal velocity?”

- Look at the picture of the sky diver on page 407. Because the forcesd of air resistance and gravity are balanced, is the skydiver at REST? Why or why not?

- What would be the main difference between a parachute for a person and a parachute for an airplane?

- Why are astronauts in the orbiting space shuttle not “weightless?”

- What is “projectile motion?”

- In the red and yellow ball illustration on page 409, why do both balls reach the ground at the same time?

- Why doesn’t a thrown baseball orbit the earth?

- Name the two components that make up orbital motion, and explain why objects stay in orbit.

- A friend in an ultralight plane is flying over you at an altitude of 200 feet and a speed of 35 miles/hr. He releases a water balloon directly over your head. Does it hit you? Why or why not?

**Newton****’s 3 ^{rd} Law – Chapter 12 – Quiz Questions #5**

pp. 412 - 415

- State and give an example of Newton’s 3
^{rd}Law of Motion.

- Give two examples of how forces always occur in pairs.

- Why don’t the forces in a force pair cancel each other?

- Explain your bottle rocket’s action using Newton’s 3
^{rd}Law of Motion.

- If a horse pulls a cart with a certain horizontal force, the cart exerts an equal and opposite force on the horse. If this is so, how can the cart accelerate?

- In the early 1900’s many people thought that rockets could not work in space because there was no ground for the rocket to push off from. Explain why rockets work just fine in space.

- Explain how Newton’s 2
^{nd}Law is responsible for space travel.

**Momentum – Chapter 12 – Quiz Questions #6**

pp. 414 - 417

- Define the word “momentum.”

- What is the formula for momentum?

- To what two quantities is momentum proportional?

- When you apply a force to an object, do you change its momentum?

- Why do modern cars have “crumple zones?”

- State the Law of Conservation of Momentum and give an example.

- The mass of a ball is 2kg. The ball is moving at 5 m/s. What is the momentum of the ball?

**Summary – Chapter 12 – Quiz Questions #7**

p. 421

- State Newton’s 1
^{st}Law of Motion and give an example.

- State Newton’s 2
^{nd}Law of Motion and give an example.

- What is the formula for FORCE?

- Compare weight and mass.

- What is the Law of Universal Gravitation?

- Define “free fall.”

- Define “projectile motion.”

- For Newton’s 3
^{rd}Law of Motion, why don’t action-reaction forces cancel out?

- What is the formula to determine momentum?

- What happens to momentum in collisions?

- A wrestler weighs in for the first match on the moon. Will the athlete weigh more or less on the moon than he does on Earth? Explain your answer by using the terms WEIGHT, MASS, FORCE, and GRAVITY.

- You and a buddy are arm wrestling but seem to be matched in strength so that no movement occurs. Your hands are locked in the 12 o’clock (upright) position. Describe the situation in terms of one of Newton’s Laws.