Gravitational force
What is gravitational force ?
a) A force that attracts objects to the Earth
b) A force that repels objects from the Earth
c) A force that attracts any two masses toward each other
d) A force that only affects objects with a charge
c) A force that attracts any two masses toward each other
What is frictional force ?
a) A force that speeds up an object's motion.
b) A force that resists the motion of an object.
c) A force that only acts when two objects are in the air.
d) A force that only occurs when objects are in motion
b) A force that resists the motion of an object.
What is an applied force?
a) A force exerted by gravity.
b) A force that is exerted by an object on its surroundings.
c) A force that is directly applied by a person or object to another object.
d) A force that always opposes motion.
c) A force that is directly applied by a person or object to another object.
What is a contact force?
a) A force that acts at a distance without any physical contact.
b) A force that occurs when two objects are physically in contact with each other.
c) A force that only acts on stationary objects.
d) A force that only acts in the absence of air.
b) A force that occurs when two objects are physically in contact with each other.
What is the normal force?
a) The force exerted by an object in motion.
b) The upward force exerted by a surface to support the weight of an object resting on it.
c) The force of gravity acting on an object.
d) The force exerted by a spring when compressed or stretched.
b) The upward force exerted by a surface to support the weight of an object resting on it.
How is the gravitational force between two objects calculated?
a) Using Coulomb’s Law
b) Using Newton’s Law of Universal Gravitation
c) Using Bernoulli’s principle
d) Using Hooke’s Law
b) Using Newton’s Law of Universal Gravitation
Which type of friction occurs when an object is at rest and resists the initiation of motion?
a) Kinetic friction.
b) Rolling friction.
c) Static friction.
d) Fluid friction.
c) Static friction
Which of the following is an example of an applied force?
a) The gravitational force acting on a falling apple.
b) A person pushing a shopping cart.
c) The normal force exerted by the ground on a resting book.
d) The frictional force between a car's tires and the road.
b) A person pushing a shopping cart.
Which of the following is an example of a contact force?
a) Gravitational force between the Earth and the Moon.
b) The force of friction when a car brakes.
c) The magnetic force between two magnets.
d) The electrostatic force between charged particles.
b) The force of friction when a car brakes
Which of the following best describes the direction of the normal force?
a) The normal force always acts vertically downward.
b) The normal force always acts horizontally.
c) The normal force always acts perpendicular to the surface of contact.
d) The normal force acts in the opposite direction of motion.
Answer: c) The normal force always acts perpendicular to the surface of contact.
How does the mass of an object affect the gravitational force it exerts?
a) It decreases the force proportionally to the square of the mass
b) It increases the force proportionally to the square of the mass
c) The gravitational force is unaffected by mass
d) The gravitational force is directly proportional to the mass
d) The gravitational force is directly proportional to the mass
Which of the following factors does NOT affect the amount of friction between two surfaces?
a) The weight of the object.
b) The surface area in contact.
c) The type of materials in contact.
d) The roughness of the surfaces.
b) The surface area in contact.
What does an applied force do to an object?
a) It always causes the object to move in the direction of the force.
b) It changes the velocity of the object, causing it to accelerate or decelerate.
c) It causes the object to become heavier.
d) It can only cause rotation, not linear motion
b) It changes the velocity of the object, causing it to accelerate or decelerate.
Which of the following is NOT a type of contact force?
a) Frictional force.
b) Tension force.
c) Gravitational force.
d) Normal force.
c) Gravitational force.
If an object is resting on a flat, horizontal surface, what is the direction of the normal force?
a) Vertically downward.
b) Vertically upward.
c) Horizontally, to the right.
d) Horizontally, to the left.
b) Vertically upward.
How does the distance between two objects affect the gravitational force between them?
a) The force increases as the distance increases
b) The force remains constant regardless of distance
c) The force decreases as the distance increases
d) The force decreases as the distance decreases
c) The force decreases as the distance increases
What happens when the force applied to an object exceeds the maximum static friction?
a) The object remains stationary.
b) The object starts to move, and kinetic friction takes over.
c) The object will continue to accelerate indefinitely.
d) The object becomes heavier.
b) The object starts to move, and kinetic friction takes over.
. If a person applies a force to a stationary object but the object does not move, what could be the reason?
a) The applied force is too weak.
b) The applied force is greater than the force of gravity.
c) There is another force, such as friction or static friction, counteracting the applied force.
d) The applied force is not acting in the correct direction.
c) There is another force, such as friction or static friction, counteracting the applied force.
What happens when two surfaces are in contact and friction acts between them?
a) The objects move faster.
b) The surfaces resist relative motion and may generate heat.
c) The objects increase in mass.
d) The friction force causes the objects to move in the opposite direction.
b) The surfaces resist relative motion and may generate heat.
What determines the magnitude of the normal force on an object resting on a flat surface?
a) The object’s velocity.
b) The object’s mass and the force of gravity.
c) The object’s temperature.
d) The size of the surface in contact with the object.
b) The object’s mass and the force of gravity.
Why do objects fall toward Earth?
a) Because Earth pushes objects downward
b) Because Earth creates an upward force
c) Because Earth attracts objects due to gravity
d) Because Earth repels objects from the atmosphere
c) Because Earth attracts objects due to gravity
Which of the following is true about kinetic friction?
a) Kinetic friction is always greater than static friction.
b) Kinetic friction only occurs when objects are in motion relative to each other.
c) Kinetic friction does not depend on the type of materials involved.
d) Kinetic friction decreases when the speed of the moving object increases.
b) Kinetic friction only occurs when objects are in motion relative to each other.
Which of the following best describes the direction of an applied force?
a) It always acts vertically upwards.
b) It always acts horizontally.
c) It acts in the direction in which the force is applied.
d) It acts in the opposite direction of motion.
c) It acts in the direction in which the force is applied.
Which of the following is an example of a normal force?
a) The force a person applies to a door to open it.
b) The force of gravity pulling an object downward.
c) The upward force exerted by a surface to support an object resting on it.
d) The frictional force that resists sliding motion.
c) The upward force exerted by a surface to support an object resting on it.
What happens to the normal force when an object is on an inclined plane?
a) The normal force becomes zero.
b) The normal force acts along the surface of the incline.
c) The normal force is equal to the object's weight.
d) The normal force acts perpendicular to the inclined surface and is less than the object’s weight.
d) The normal force acts perpendicular to the inclined surface and is less than the object’s weight.