Question 1:

Which of the following is an example of a force of gravity?

A) Pushing a box across the floor
B) A ball rolling down a hill
C) Sliding on an icy surface
D) Stretching a rubber band

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Explanation: The correct answer is B) A ball rolling down a hill. Gravity is the force that pulls objects towards the center of the Earth. In the case of a ball rolling down a hill, gravity is responsible for the downward motion of the ball.

Question 2:

Which of the following forces opposes the motion of objects sliding on a surface?

A) Tension force
B) Friction force
C) Gravity force
D) Magnetic force

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Explanation: The correct answer is B) Friction force. Friction is the force that opposes the motion of objects sliding or moving across a surface. It acts in the opposite direction of the applied force.

Question 3:

Which of the following factors does NOT affect the force of friction between two surfaces?

A) Mass of the object
B) Roughness of the surfaces
C) Temperature of the surroundings
D) Normal force between the surfaces

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Explanation: The correct answer is C) Temperature of the surroundings. The force of friction between two surfaces is influenced by factors such as the roughness of the surfaces, the normal force between the surfaces, and the presence of lubricants. The temperature of the surroundings does not directly affect the force of friction.

Question 4:

Which of the following statements is true regarding the force of gravity?

A) It always acts in the opposite direction of the applied force
B) It is a contact force
C) It depends on the speed of the object
D) It is proportional to the mass of the object

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Explanation: The correct answer is D) It is proportional to the mass of the object. The force of gravity is an attractive force that acts between any two objects with mass. The magnitude of the force of gravity is directly proportional to the mass of the objects involved.

Question 5:

Which of the following is an example of a situation where friction is desirable?

A) Sliding on ice
B) Braking a car
C) Using lubrication
D) Riding a bike

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Explanation: The correct answer is B) Braking a car. In the context of braking a car, friction between the brake pads and the rotors or drums is essential to slow down and stop the car effectively. The friction force allows the conversion of kinetic energy into heat energy, resulting in the deceleration of the car.