Pushes and pulls Knowledge-Based Practice

Questions

1. 1.

   In science, which term is used to describe any push or pull exerted on an object?

   • A) Energy
   • B) Pressure
   • C) Force
   • D) Inertia
2. 2.

   Two students push a stationary box across a flat floor in opposite directions. If the push toward the east is stronger than the push toward the west, what will happen to the box?

   • A) It remains at rest because opposing pushes always cancel each other out.
   • B) It begins moving toward the west because the weaker push offers less resistance.
   • C) It begins moving toward the east because the push in that direction is stronger.
   • D) It moves upward off the floor because the opposing pushes push against each other.
3. 3.

   When two objects interact by pushing against each other, how do the forces they exert on each other compare?

   • A) The object with greater mass exerts a stronger push than the lighter object.
   • B) Both objects exert pushes of equal strength on each other in opposite directions.
   • C) Only the object actively initiating the contact exerts a pushing force.
   • D) The faster-moving object exerts a stronger push than the slower object.
4. 4.

   Which scientific instrument is commonly used to measure the strength of a push or pull exerted on an object?

   • A) A force meter
   • B) A graduated cylinder
   • C) A pan balance
   • D) A thermometer
5. 5.

   Which standard unit is used in science to measure the strength of a push or a pull?

   • A) Kilogram
   • B) Joule
   • C) Newton
   • D) Meter
6. 6.

   Which type of force can be exerted on an object using a flexible string or rope?

   • A) It can exert both a push and a pull depending on how quickly it is moved.
   • B) It can exert only a pull because it goes slack when pushed toward the object.
   • C) It can exert only a push because applied force travels outward from the user.
   • D) It cannot exert any push or pull because forces require rigid solid rods.
7. 7.

   Which two characteristics are required to completely describe any push or pull acting on an object?

   • A) Its speed and duration
   • B) Its strength and direction
   • C) Its mass and weight
   • D) Its shape and surface area
8. 8.

   When an object initially at rest is acted upon by a single push or pull, in which direction does it begin to move?

   • A) In a direction perpendicular to the applied force
   • B) In the same direction as the applied push or pull
   • C) In the direction opposite to the applied push or pull
   • D) In a circular path around the point of contact
9. 9.

   Which of the following is an example of a push or pull that acts without direct physical contact between objects?

   • A) A magnet pulling an iron paperclip toward itself from a short distance
   • B) A child pulling a wooden wagon forward using a rope
   • C) A soccer player pushing a ball forward with a kick
   • D) A person pushing a heavy door open with their hands
10. 10.

    A student pushes a heavy box forward from behind while a second student pulls the front of the box forward using a rope. How do these two forces affect the movement of the box?

    • A) The two forces act in the same direction and combine to move the box forward more effectively.
    • B) The push and the pull cancel each other out because they are applied to opposite ends of the box.
    • C) The pull prevents the box from moving because pulling forces always resist pushing forces.
    • D) The box rotates in place because a push and a pull cannot move an object in a straight line.
11. 11.

    How do the effects of a pushing force and a pulling force differ when applied to the ends of a flexible spring?

    • A) A push stretches the spring to make it longer, while a pull leaves its length unchanged.
    • B) A push leaves the spring's length unchanged, while a pull compresses it to make it shorter.
    • C) A push compresses the spring to make it shorter, while a pull stretches it to make it longer.
    • D) Both a push and a pull compress the spring to make it shorter.
12. 12.

    A student applies the same forward push to a light tennis ball and a much heavier bowling ball, both initially at rest on a flat, smooth floor. How does the motion of the two balls compare immediately after the push?

    • A) Both balls will reach the same speed because the applied push is identical in strength.
    • B) The bowling ball will reach a higher speed because heavier objects retain more motion when pushed.
    • C) Neither ball will move forward because a brief push cannot change the state of a stationary object.
    • D) The tennis ball will speed up much more quickly than the bowling ball because it has less mass.
13. 13.

    A marble is rolling in a straight line across a smooth, level floor. What is the effect of applying a gentle push to the marble directly from the side?

    • A) The marble immediately comes to a complete stop.
    • B) The marble reverses direction and travels straight backward.
    • C) The marble changes its direction of motion and continues along a new path.
    • D) The marble continues along its original straight line without any deviation.
14. 14.

    A toy car is rolling forward along a smooth, straight track. What effect will a push applied in the direction opposite to its motion have on the car?

    • A) The car will slow down or come to a stop.
    • B) The car will speed up in its original forward direction.
    • C) The car will continue moving forward at an unchanged speed.
    • D) The car will instantly gain mass and become heavier.
15. 15.

    A student applies a weak push to a stationary cart, and then tests a much stronger push on the same cart in the same direction. How does the motion of the cart compare after the stronger push?

    • A) The cart changes its speed by a smaller amount because greater applied forces face greater internal resistance.
    • B) The cart changes its speed by the exact same amount because the mass of the cart remains constant.
    • C) The cart changes its speed by a greater amount because a stronger push produces a larger acceleration.
    • D) The cart remains completely stationary because sudden strong forces prevent motion from starting.
16. 16.

    When two students push a stationary crate from opposite sides with equal force, what happens to the crate?

    • A) It accelerates in the direction of the push from the left.
    • B) It remains at rest because the two opposing pushes balance each other.
    • C) It moves in the direction of whichever push was applied first.
    • D) It oscillates back and forth continuously between the two students.
17. 17.

    Which of the following statements correctly identifies a requirement for any push or pull to occur?

    • A) An interaction between at least two distinct objects must take place.
    • B) The object receiving the force must already be in motion.
    • C) The applied force must cause a permanent change in the object's shape.
    • D) The surface must be completely frictionless for the force to act.
18. 18.

    Which of the following statements correctly describes an effect that both pushes and pulls can have on an object?

    • A) They permanently increase the total mass of the object.
    • B) They can change the object's speed, direction of motion, or shape.
    • C) They can only exert an effect if the object is already moving.
    • D) They prevent any other forces from acting on the object simultaneously.
19. 19.

    Which statement correctly describes the directional difference between applying a push and applying a pull on an object?

    • A) Both pushes and pulls act to draw an object closer to the source of the force.
    • B) A push attracts an object toward the source, while a pull drives it away.
    • C) A push and a pull can only act vertically downward toward the ground.
    • D) A push directs an object away from the source of the force, whereas a pull draws it closer.
20. 20.

    Which of the following everyday actions is an example of applying a pull force?

    • A) Kicking a soccer ball across a field
    • B) Opening a desk drawer toward yourself
    • C) Striking a nail into a wooden board with a hammer
    • D) Pressing a button down on a computer keyboard

Answers and step-by-step solutions appear after you finish the test.