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# Force & Motion review.

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Force & Motion review

Question 1 A large bus travels city streets. It takes the bus 10 seconds to cross each city block. If all the city blocks are the same length, what can be said about the bus? It is accelerating. It is decelerating. It is moving at a constant velocity. It is moving with varying acceleration. Answer: It is moving at a constant velocity.

Question 2 Which of the following examples of forces acting on objects requires the objects in question to come into physical contact with one another? The transfer of motion between balls on a pool table. The falling of a bird’s feather toward the ground. The movement of a compass needle to point to the north The orbiting of the moon around Earth. Answer: The transfer of motion between balls on a pool table.

Question 3 The graph shows the position of a car in motion along an east-west road over a period of 10 minutes. The car’s position is recorded at 1-minute intervals. At time = 0, the car’s position is at the starting point. What is the car’s motion relative to the starting point at time = 8 minutes? at rest at the starting point in motion at the starting point moving toward the starting point moving away from the starting point Answer: Moving toward the starting point

Question 4 The graph shows the position of a car in motion along an east-west road over a period of 10 minutes. The car’s position is recorded at 1-minute intervals. At time = 0, the car’s position is at the starting point. What is the total distance traveled by the car after 10 minutes?  600 meters 1,200 meters 2,000 meters 3,600 meters Answer: 1,200 meters

Question 5 On Saturday Ashley rode her bicycle to visit Maria. Maria’s house is directly east of Ashley’s. The graph below shows the distance Ashley was from her house after each minute of her trip.    According to the graph, during which time segment was Ashley moving the fastest? Between 0 and 2 minutes Between 0 and 4 minutes Between 4 and 8 minutes Between 8 and 10 minutes Answer: Between 8 and 10 minutes

Question 6 A car is traveling south at a speed of 64 miles per hour and then begins traveling west but continues traveling at the same speed. Which of the following has changed? mass velocity speed gravity Answer: velocity

Question 7 What causes changes in motion? Answer: force force
change in position velocity speed Answer: force

Question 8 You watch a person dive off a diving board. What reference point have you probably used to determine the diver’s motion? the other divers climbing up to the diving board the birds flying by the diving board the swimmers In the water Answer: the diving board

Question 9 Objects remaining at rest or continually in motion have
mass inertia speed Friction Answer: inertia

Question 10 What was the total distance traveled by the runner?
10 meters 20 meters 30 meters 40 meters Answer: 40 meters

Question 11 Which of these describes the speed of the runner during the entire trip? increased constant decreased varied Answer: constant

Question 12 Which statement explains why the rope is moving toward the team on the left? the unbalanced force accelerates the object in the direction of the stronger force the balanced force allows the rope to move to the left the net force between the two teams is zero the rope is shorter on the left Answer: the unbalanced force accelerates the object in the direction of the stronger force

Question 13 The force of ___________ is the attraction between objects. gravity weight motion Friction Answer: gravity

Question 14 Motion is an increase in the speed of an object
a decrease in the speed of an object the stopping of an object relative to a frame of reference a change in position relative to a frame of reference Answer: a change in position relative to a frame of reference

Question 15 An object at rest will remain at rest and an object in motion will remain in motion unless acted upon by a force. Newton’s 1st Law of Motion Newton’s 2nd Law of Motion Newton’s 3rd Law of Motion Answer: Newton’s 1st Law of Motion

Question 16 A train is traveling west at a speed of 35 mph and then changes direction and heads north at the same speed. What has changed? Speed Momentum Velocity Inertia Answer: velocity

Question 17 In the diagram below, g is the force of gravity, r is the force of the ramp acting on the car and f is the force of friction. Which diagram shows the directions of the forces acting on a car as it travels down the ramp? Answer:

Question 18 Acceleration of an object depends on its mass and the size and direction of the force acting on it. Newton’s 1st Law of Motion Newton’s 2nd Law of Motion Newton’s 3rd Law of Motion Answer: Newton’s 2nd Law of Motion

Question 19 For every action, there is an equal and opposite reaction.
Newton’s 1st Law of Motion Newton’s 2nd Law of Motion Newton’s 3rd Law of Motion Answer: Newton’s 3rd Law of Motion

Question 20 It is a calm, clear, sunny afternoon. You are traveling forward in a moving car, why do the trees outside appear to be moving backwards? You are judging motion as if you were stationary. The wind is blowing the trees. The moving car affects your balance. It is an optical illusion. Answer: You are judging motion as if you were stationary

Question 21 Chris is on his way to work. It had been a busy morning and he was running late. As Chris approached an intersection, the traffic light turned from yellow to red. This frustrated him because he had to be at work in five minutes. Above is the motion graph of Chris’s morning commute from his home to his work. How long was Chris stopped at the traffic light? Chris was stopped at the traffic light for 2 minutes Chris was stopped at the traffic light for 6 minutes. Chris was stopped at the traffic light for 8 minutes. Chris was stopped at the traffic light for 15 minutes. Answer: Chris was stopped at the traffic light for 2 minutes

Question 22 A force that acts in a direction opposite to the motion of the moving object. Friction Gravity Static Force Momentum Answer: Friction

Question 23 Ms. Williams’ science class uses a toy car race to study and collect data about forces and motion. The racetrack shown has a 6-meter ramp and a 5-meter level section to the finish line. Two cars compete at a time.   On what section of the racetrack will the forces on the cars be balanced? the starting block the ramp only the level section after the ramp the entire track Answer: the starting block

Question 24 Ms. Williams’ science class uses a toy car race to study and collect data about forces and motion. The racetrack shown has a 6-meter ramp and a 5-meter level section to the finish line. Two cars compete at a time.     At what point on the track does a car reach its fastest speed? halfway down the ramp at the bottom of the ramp halfway down the level section at the finish line Answer: at the bottom of the ramp

Question 25 A seatbelt is used to protect you from which of Newton’s Laws of Motion? Newton’s 1st Law of Motion Newton’s 2nd Law of Motion Newton’s 3rd Law of Motion Answer: Newton’s 1st Law of Motion

Question 26 Which one of Newton’s Laws of Motion explains why it is easier to push an empty shopping cart than one filled with groceries? Newton’s 1st Law of Motion Newton’s 2nd Law of Motion Newton’s 3rd Law of Motion Answer: Newton’s 2nd Law of Motion

Question 27 A rocket is an example of which one of Newton’s Laws of Motion? Newton’s 1st Law of Motion Newton’s 2nd Law of Motion Newton’s 3rd Law of Motion Answer: Newton’s 3rd Law of Motion

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