# Final Review: Question Preview (ID: 27895)

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**A student wants to test the impact of X-ray radiation on tomato plant growth. Which of the following guidelines should be followed when designing the control group?**

a) It is not exposed to X-ray radiation.

b) It is not exposed to ultraviolet light.

c) It is exposed to increased microwave radiation.

d) It is exposed to twice as intense radiation.

**An investigation is performed to determine how the angle of a ramp affects the speed of a ball as it rolls down the ramp. In addition to using the same ball and the same ramp, which of these should also remain constant?**

a) Releasing the ball from the same position in each trial

b) Keeping the ramp at the same height for all trials

c) Keeping the ramp facing the same direction for all trials

d) Measuring the length of the ramp before each trial

**A student applied equal forces to 2 carts for the same amount of time. He wants to use line graphs to show that Cart 1 accelerated at a greater rate than Cart 2. Which set of axis labels should the student use to best convey this relationship?**

a) time label for the horizontal axis and direction label for the vertical axis

b) time label for the horizontal axis and velocity label for the vertical axis

c) force label for the horizontal axis and direction label for the vertical axis

d) force label for the horizontal axis and velocity label for the vertical axis

**A 6-N force and an 8-N force act at a 90-degree angle to each other on the same object. What is the magnitude of the net force acting on the object?**

a) 2N

b) 5N

c) 10N

d) 14N

**Franklin wants to know how fast he runs different distances. He uses a stopwatch to measure the time it takes him to complete a 50-meter, 100-meter, and 200-meter race. How can he calculate his speed for each race?**

a) Add the distances and the times.

b) Divide the distances by the times.

c) Multiply the distances by the times.

d) Subtract the distances from the times.

**A cartâ€™s initial velocity is 3.0 meters per second. What is its final velocity after accelerating at a rate of 1.5 m/s2 for 8.0 seconds?**

a) 9 m/s

b) 15 m/s

c) 36 m/s

d) 72 m/s

**A bicycle with an initial velocity of 6.0 m/s accelerates at a rate of 2.0 m/s2 for 3 seconds. What distance does the bicycle travel during this time?**

a) 9 m

b) 18 m

c) 27 m

d) 36 m

**A student wishes to measure the speed of a toy car at the bottom of an inclined plane. Which information is needed to calculate speed?**

a) the mass of the car and the height of the inclined plane

b) the friction of the surface of the inclined plane and the mass of the car

c) the length of the inclined plane and the time for the car to descend the inclined plane

d) the length of the car and the time for the car to descend the inclined plane

**A heavy round rock and a light marble are simultaneously dropped from the same height. Why would they most likely land at the same time?**

a) Both are slowed equally by friction.

b) Both accelerate at the same rate.

c) They have equal kinetic energy.

d) They have equal volumes.

**A student drops a bowling ball and an apple from a third story window. Both objects hit the ground at the same time. From the experiment the student should conclude that :**

a) the apple weighs more than the bowling ball.

b) the bowling ball speeds up faster than the apple.

c) more air friction is acting on the apple than on the bowling ball.

d) gravity pulls on both objects causing them to fall at the same rate.

**When a person parachutes from a plane, she travels at about 67 meters per second. When she pulls her cord and her chute opens, she slows to about 3 meters per second. When her parachute opens, which is happening?**

a) She has a positive change in speed.

b) She has a positive change in velocity.

c) She has a positive change in acceleration.

d) She has a negative change in potential energy.

**From t = 10.0 seconds to t = 15.0 seconds, a space shuttle increased speed from 57 m/s to 99 m/s. What was the average acceleration of the shuttle?**

a) 4.2

b) 8.4

c) 10.4

d) 31.2

**A car is moving at a constant speed of 16 kilometers per hour (km/h) while traveling in a circle. Why is the velocity of the car changing?**

a) because the direction of the car is changing

b) because the mass of the car is constant

c) because the speed is constant

d) because the time is changing

**A school bus moves past a parked car at a speed of 30 km/h. Which of the following best describes the observation made by a passenger on the bus?**

a) The car appears to be moving 30 km/h in the same direction as the bus.

b) The car appears to be moving 30 km/h in the opposite direction of the bus.

c) The car appears to be moving 15 km/h in the same direction as the bus.

d) The car appears to be moving 15 km/h in the opposite direction of the bus.

**Traveling in opposite directions, buses A and B pass each other at the speed of 25 km/h, while a passenger on bus A walks toward the back of the bus at the speed of 5 km/h. What is the velocity of the passenger on bus A relative to bus B?**

a) 20 km/h in the direction of bus A

b) 20 km/h in the direction of bus B

c) 30 km/h in the direction of bus A

d) 30 km/h in the direction of bus B

**A boat is moving at a speed of 7 m/s relative to the water. A dog walks from the front to the back of the boat at a speed of 2 m/s relative to the boat. What is the speed of the dog, in m/s, relative to the water?**

a) 3.5 m/s

b) 5 m/s

c) 9 m/s

d) 14 m/s

**An observer is watching a passenger moving on a moving sidewalk at the airport. The observer knows that the sidewalk is moving at 5 km/h yet the passenger appears to be moving at 12 km/h. Which would best explain what the observer sees?**

a) The passenger is moving 7 km/h in the same direction of the sidewalk.

b) The passenger is moving 5 km/h in the same direction of the sidewalk.

c) The passenger is moving 7 km/h in the opposite direction of the sidewalk.

d) The passenger is moving 12 km/h in the opposite direction of the sidewalk.

**Galileo designed experiments in which he dropped objects with different masses from the same height. Regardless of the mass, the objects appeared to hit the ground at the same time. What did Galileo discover from these studies?**

a) Acceleration due to gravity is independent of mass.

b) An object falls faster than another object that has lower weight.

c) The rate at which an object falls is inversely proportional to its mass.

d) The weight of an object is independent of its mass.

**Near the surface of Earth, all objects have the same rate of acceleration when they fall in a vacuum chamber. Which best explains why objects with different masses will have the same acceleration?**

a) The force of gravity is affected by distance but not by mass.

b) The distance the objects travel to reach the center of gravitational attraction of Earth is very small.

c) The mass of Earth is so much greater than any object on the planet that Earth exerts almost all of the gravitational force

d) Differences in acceleration only occur when objects move through an atmosphere that causes air resistance.

**Which of these will reduce the gravitational force between two objects the most?**

a) halving the distance between them

b) doubling the distance between them

c) halving the distance between them and doubling their mass

d) doubling the distance between them and halving their mass

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