Tommy was walking at a rate of 4 miles/hour at noon and at 12:30 pm he was walking at a brisk rate of 6 miles/hour. Two hours later Tommy was walking at a leisurely rate of 2 miles/hour. Which statement about Tommy's acceleration is true?

• A) Tommy had an acceleration of zero the entire time.
• B) Tommy had a positive acceleration between noon and 12:30 pm.
• C) Tommy had a positive acceleration between 12:30 and 2:30 pm.
• D) Tommy had a negative acceleration between noon and 12:30 pm.

Tags

CCSS.HSF.IF.B.4

Which example best represents an object with balanced forces acting upon it?

• A) A boat moving through the water.
• B) A book sitting on a high shelf.
• C) A wagon rolling down a steep hill.
• D) A baseball thrown in the air.

When net forces are not equal on an object, the object moves in the direction of:

• A) The lesser force
• B) It does not move
• C) The greater force
• D) Towards the center of the Earth

Which BEST compares the motions of dots C and D?

• A) Both C and D are speeding up.
• B) Both C and D are moving at a constant velocity.
• C) C is speeding up and D is moving at a constant velocity.
• D) C is slowing down and D is moving at a constant velocity.

Consider the four free body diagrams. Free-body diagrams are diagrams used to show the relative magnitude and direction of all forces acting upon an object in a given situation. Do any of the free body diagrams indicate motion? If yes, which one(s). Explain.

• A) No. In each case, the forces are balanced.
• B) Yes. In B the book is slowing down because of the friction force opposing motion.
• C) You cannot tell if there is any motion. You can only determine how much force is acting on the objects.
• D) Yes. In B and D. In both cases, there is a net force. In B, there is a net force to the left; in D there is a net force upward.
• Option 5

A child had a 600g basketball, a 500g football, a 150g baseball, and a 50g yo-yo. If the child had to throw one of the four, which one would take the MOST force to throw?

• A) baseball
• B) basketball
• C) football
• D) yo-yo

In baseball, a home run means the batter has hit the baseball into the stands, beyond the baseball field. Bunting means that the batter has lightly made contact and the ball stays on the in-field. Compare the force of the batter when bunting the ball into the in-field versus hitting a home run.

• A) There is no way to estimate the batter's force.
• B) The force is much less when bunting into the in-field.
• C) The force of the batters in each case is about the same.
• D) The force of the batter is much less when hitting the ball out of the park.

Car A travels from New York to Miami at 25 m/s (from North to South). Car B travels from New York to Chicago, also at 25 m/s (from East to West). Car A and Car B have ___________ speeds and ____________ velocities.

• A) equal, equal
• B) equal, different
• C) different, equal
• D) different, different

Tags

CCSS.HSN.VM.A.3

A train engineer started the train from a standstill and sped up to 5 meters per second, she then rounded a corner at a constant speed. She then sped the train up to 10 meters per second on the next straightaway. Next, the train chugged around another bend at 10 m/sec, and then its speed slowed to 5 meters per second after coming out of the bend. Finally, the train reached the station, and the engineer applied the brakes and brought the engine to a stop. How many times did the train accelerate?

• A) 2
• B) 4
• C) 5
• D) 6

The graph shows the speed of a car during a trip along the highway. What can you say, in general, about the speed of the car?

• A) The speed of the car is constant during the trip.
• B) The car is moving at a slow rate of speed.
• C) The speed of the car is increasing throughout the trip.
• D) The speed of the car varies at different times during the trip.

Tags

CCSS.HSF.IF.B.4