**Chapter 11 – Speed & Acceleration**

**Speed – Chapter 11 – Quiz Questions #1**

pp. 363 - 369

- Define DISPLACEMENT.

- Define SPEED.

- Define VELOCITY

- Which should you use in calculating how many gallons of gas you will need to make a road trip – distance or displacement? Give your answer and explain.

- Explain the concept of “frame of reference.”

- You are on a boat going down a river at 5 km/hr. The river is flowing in the same direction at 2 km/hr. What is the combined speed of the boat? What would the speed of the boat be if you reversed your direction of travel and went upstream?

- What is the formula for determining average speed?

- What is meant by the term “instantaneous speed?”

- What does the term “average speed” mean?

- You are in a car traveling forward at 35 miles/hr. It is raining. There is no wind. Why does the rain appear to be coming straight towards the windshield?

- List 3 units of measurement for … a) distance, b) time, c) speed, d) velocity

- Speed is dependent upon what two factors?

- What is the difference between SPEED and VELOCITY?

- CAR #1 is going 25 km/hr on the highway. CAR #2, going 50 km/hr just passedCar #1. a) If your frame of reference is car #1, what is the speed of car #2? b) If your frame of reference is car #2, what is the speed of car #1?

- A skateboard is heading towards a tree at 3 km/hr. Describe what you see from these frames of reference: a) the skateboard, b) bystander on the side of the path, c) the tree.

**Graphing Motion – Chapter 11 – Quiz Questions #2**

pp. 370 - 371

- What is an INDEPENDENT VARIABLE?

- What is a DEPENDENT VARIABLE?

- On a distance – time graph what is the “independent variable?”

- For line graphs which axis do you use for distance, which axis for time?

- If you have a distance – time graph of the speed of an automobile and it is NOT a straight line, what does that mean?

- On a distance – time graph for a vehicle moving at a constant speed, describe the slope of the line if the car is moving …. a) very fast, b) parked and not moving, c) moving slowly

- Imagine that you could ride a baseball that is hit hard enough for a home run. Using the concept of frame of reference, describe what is happening from these perspectives: a) batter, b) you sitting on top of the baseball, c) outfielder trying to catch the hit.

- Look at the three distance (vs) time graphs on page 371. What is the average speed of each car: a) Fast-moving car, b) Slow-moving car, c) Car with changing speed?

- Look at the Distance Vs. Time graph on the bottom left-hand corner of page 370. Visually compare the red line with the blue line and green line. Calculate the slope of the red line.

- Using the Distance Vs. Time graph on the bottom left-hand corner of page 370, list the relative speeds (fast, medium, slow) of the colored lines: a) Red line, b) Green line, c) Blue line.

**Acceleration – Chapter 11 – Quiz Questions #3**

pp. 372 – 377

- Define ACCELERATION.

- Acceleration can be a change in what two things?

- Is it possible to constantly accelerate when never speeding up or slowing down? Why or why not?

- What is CENTRIPETAL ACCELERATION?

- What is the formula for acceleration?

- If an objects starts at rest, what is its initial velocity?

- How would the answer to an acceleration problem be shown if an object is slowing down?

- List three examples of positive acceleration.

- List three examples of negative acceleration.

- List three examples of acceleration due to a change in direction.

- Word Problem: Natalie begins from a stop and then accelerates her skateboard to 4 m/s in 2.5s. What is her acceleration?

- Word Problem: A turtle is swimming towards shore at 0.5 m/s. After 4s, its speed has increased to 0.8 m/s. What is the turtle’s acceleration?

**Forces – Chapter 11 – Quiz Questions #4**

pp. 380 - 382

- Define the word FORCE.

- What are the four FUNDAMENTAL FORCES?

- Give two examples of FIELD FORCES.

- What are BALANCED FORCES?

- What are UNBALANCED FORCES?

- Do balanced forces change motion?

- What is the NET FORCE acting on a piano if ….. a) two students are each putting a force of 100N on the piano from the same side, or b) if the students are pushing from opposite sides of the piano?

- Using BALANCED or UNBALANCED to describe the forces you would prefer, consider these examples and state why you chose your answer: a) Building a house, b) Riding your bicycle, c) Sitting on top of a fence, d) Riding a roller coaster.

- When an object is at rest, are any forces acting upon it? Explain.

**Friction – Chapter 11 – Quiz Questions #5**

pp. 382 - 387

- Define FRICTION.

- Define STATIC FRICTION.

- Define KINETIC FRICTION.

- Explain what is happening with STATIC FRICTION when you push on an object but do not move it.

- Why is static friction usually greater than kinetic friction?

- List the three types of KINETIC FRICTION and provide an example of each.

- How can you reduce friction for each of the three types of kinetic friction?

- How can you INCREASE static friction?

- Describe three ways to reduce the force of friction between a heavy block and a table top.

- What is the amount of static friction acting on a truck if the truck does not move and the force pulling the truck downhill is 2000N? (Note: answer must include number + direction of force).

- How are balanced and unbalanced forces related to static and kinetic friction?

- What happens when a net force acts upon an object?

**Summary – Chapter 11 – Quiz Questions #6**

p. 389

- Define MOTION.

- Define SPEED.

- What is the formula for SPEED?

- What kind of line is produced by using a distance – time graph to illustrate constant speed?

- What is ACCELERATION?

- What are the three things that acceleration can mean?

- What is the formula for ACCELERATION?

- What are the four fundamental forces in nature?

- Explain BALANCED and UNBALANCED forces.

- Define the word FRICTION.

- List and explain the two types of friction.