Force
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| show | C
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| A rock and a brick fall off a forty-foot building at the same time.The brick is three times the mass of the rock.Which hits the ground first?A)The rock falls at one third the speed of the brick.B)The brick falls three time faster than the rock.C)Friction | show 🗑
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| Gravity is responsible for all of the following phenomena EXCEPT: A)the orbit of the planets B)the phases of the moon C)keeping objects on the surface of the Earth D)holding the solar system together | show 🗑
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| Gravitational attraction _____ as the masses of objects increase. A) decreases B) increases C) stays the same D) has no effect | show 🗑
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| show | B
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| As the distance between two objects decreases, the gravitational force between them _____. A) increases B) decreases C) evens out D) multiplies | show 🗑
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| Objects on Earth are pulled by gravity _____. A) toward the moon B) to the crust of Earth C) toward the center of Earth D) to the atmosphere of Earth | show 🗑
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| . A hand releases a ball at the top of a ramp. What force causes the ball to roll down the ramp? A) Friction B) Gravity C) Mass D) Speed | show 🗑
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| A ball is being dropped from a place above where the girl is standing. She is watching the path of the ball. Why is the ball falling downward? A)Gravity is the force pulling it down. B)Friction has no effect on the ball. C)There is no force acting | show 🗑
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| The force that one surface exerts on another when the two rub against each other is called _____. A) friction B) magnetism C) inertia D) gravity | show 🗑
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| show | C
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| As the space shuttle approaches the Earth, it begins to get hot and glow. Which of the following best explains why this happens? A)The increasing force of gravity causes the space shuttle to become hot. B)Friction heats the space shuttle as it passes t | show 🗑
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| Air resistance is a type of _____. A) motion B) displacement C) inertia D) friction | show 🗑
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| show | C
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| show | B
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| Which of the following forces oppose each other when a block of wood slides down a ramp? A)gravitational force and electrical force B)electrical force and magnetic force C)magnetic force and friction force D)friction force and gravitational force | show 🗑
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| show | B
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| show | C
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| show | B
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| show | C
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| show | A
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| Friction between surfaces can be reduced by all of the following EXCEPT: A) smoothing the surfaces B) using wheels or rollers C) lubricating or oiling the surfaces D) increasing the mass of the objects | show 🗑
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| show | B
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| . When does friction affect objects? A) When they are touching B) When they are both in motion C) When they are near each other D) When they are far away from each other | show 🗑
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| show | D
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| How does the smooth, streamlined shape of airplanes help them fly more easily? A) It decreases their mass. B) It reduces friction with air particles. C) It increases friction between the wings. D) It changes the pull of gravity | show 🗑
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| show | B
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| The pull of the Sun’s gravity keeps Earth in orbit around the Sun. What keeps the Moon in orbit around Earth? A)Gravity between Earth and the Moon B)Gravity between the Moon and the Sun C)Friction between Earth and the Moon D)Friction between the Moo | show 🗑
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| Statement: “The greater the mass of an object, the greater _____.” All of the following complete the preceding statement EXCEPT: A)its inertia is B)the distance traveled C)the force is that is needed to stop its motion D)the force is that is needed | show 🗑
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| . A scout troop rowed boats on the lake. Which best describes why the boat with three scouts moved through the water faster than the boat with five scouts? A) The force of friction between the oars and the water made the boat with three scouts move fa | show 🗑
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| Robert wants his toy car to go down a ramp more slowly. How can he slow down the car? A)He can increase the height of the ramp. B)He can make the surface of the ramp smoother. C)He can add mass to the car. D)He can lubricate the wheels of the car | show 🗑
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| All of the following would cause an object to increase its speed EXCEPT: A)increasing the force applied to the object B)removing some of the mass of the object C)applying a force in the opposite direction of motion D)adding another force to the objec | show 🗑
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| show | D
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| show | A
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| show | B
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| show | C
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| Which of the following will move the greatest distance? A) strong push on a 100 gram block B) strong push on a 50 gram block C) weak push on a 50 gram block D) weak push on a 100 gram block | show 🗑
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| Soccer player A uses a weak force to kick the soccer ball. Soccer player B uses a stronger force to kick a soccer ball with the same mass. Whose force can move the ball farther? A)Soccer player A’s force will move the ball farther. B)Soccer player B’s f | show 🗑
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| show | B
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| show | C
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| Which of the following is being acted on by a balanced pair of forces? A) a rock thrown from a cliff B) a pencil rolling off a desk C) a ball bouncing from the ground D) a rope pulled between two poles | show 🗑
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| show | B
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| A softball player hits a ball exerting 2N of force. Which of the following explains why the ball changes direction? A)The bat is moving at the same rate of Earth’s rotation and changed the ball’s direction. B)The ball is now speeding up due to the gravi | show 🗑
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| show | A
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| show | A
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| show | A
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| show | B
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| show | B
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| . When the forces acting on a mass are equal and opposite, these forces are said to be _____. A) balanced B) unbalanced C) increasing D) decreasing | show 🗑
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| The support wires work to hold up a tent because they create _____. A) balanced combined forces B) unbalanced friction forces C) balanced weak interactions D) unbalanced gravitational forces | show 🗑
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| An object moving at a constant speed and in a straight line will continue to do so until a(n) _____ acts on it. A) resistant force B) non-resistant force C) balanced force D) unbalanced force | show 🗑
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| show | A
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| show | D
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| Two forces acting on an object in a way that changes the object’s motion create ______. A) a balanced force B) an unbalanced force C) friction D) gravity | show 🗑
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| What happens to an object that is acted on by unbalanced forces? A) It gets hot. B) It stops moving. C) It changes its motion. D) It moves forward and backward. | show 🗑
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| The principal’s chair has wheels. She pulls the chair away from her desk. What makes the chair move? A)The balanced force of gravity on the chair B)The unbalanced force of her pull on the chair C)Friction between her hand and the chair D)Friction bet | show 🗑
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| A soccer ball is lying still in the grass. Which of the following observations is correct? A)The unbalanced forces are acting on it from the same direction. B)The forces acting on it are balanced. C)The force of gravity is not affecting it. D)The motio | show 🗑
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| . A ball has two forces acting on it. One force is pushing it to the left, and a larger force is pushing it to the right. In which direction will the ball move? A) Right B) Left C) Up D) Down | show 🗑
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| You are pushing on the left side of a box with a force of 18 N. Your friend is pushing on the right side of the box with a force of 16 N. The net force is pushing _____. A)up with a strength of 2 N B)to the right with a strength of 2 N C)down with a | show 🗑
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| During a game of tug-of-war,a scarf tied in the center of the rope moves to the right. Because of this,we know that __. A)the net force is zero B)the forces are balanced C)the team on the left is exerting a greater force D)the team on the right is ex | show 🗑
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| A bumper car traveling at 5 km/h going south collides head-on with another bumper car traveling at 8 km/h going north. If all other factors are equal, which direction will the first car travel after the collision? A) north B) south C) west D) east | show 🗑
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| The greater the mass of an object, _____. A) the greater its inertia B) the more balanced it is C) the more force it can exert D) the greater the space it takes up | show 🗑
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| The tendency of an object to resist change in its motion is known as _____. A) balance B) force C) inertia D) mass | show 🗑
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| show | B
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| Which of the following factors affects an object’s inertia? A) Length B) Mass C) Volume D) Width | show 🗑
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| show | C
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| The greater the inertia of an object the more _____ it takes to stop its movement. A) force B) speed C) energy D) motion | show 🗑
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| show | A
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| show | C
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| show | B
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| show | D
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| A book sliding across a floor eventually comes to rest because _____. A) of the mass of the book B) of balanced forces acting on it C) there are no forces acting on it D) friction and gravity are acting on it | show 🗑
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| According to inertia, if no forces act on a moving object, it will _______. A) remain in motion B) eventually come to rest C) eventually change direction D) slow down but never completely stop | show 🗑
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| Suppose you are riding on a bicycle and it stops suddenly. What happens to your body? A) It also stops moving. B) It keeps moving forward. C) It moves backwards. D) It speeds up. | show 🗑
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| Which is the first step in the technological design process? A) Evaluate the solution. B) Describe the problem. C) Test the possible solutions. D) Identify possible solutions | show 🗑
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| If a scientific investigation is to be considered valid, it must include all of the following EXCEPT: A)Making careful measurements B)Accurately using appropriate tools C)Recording data in an organized way D)Using a variety of units of measurement | show 🗑
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| show | A
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| The reliability of a scientific explanation can be increased by _____. A)changing the dependent variable when repeating the experiment B)taking notes once the investigation has been completed C)changing the independent variable when repeating the ex | show 🗑
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| show | D
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