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__________ is a force that resists motion between two surfaces that are in contact.A) Friction B) Acceleration C) Inertia D) Resistance 2.
Which of the following statements is true?A) When speed increases gradually, average speed and instantaneous speed are the same. B) An object does not accelerate if it turns and maintains constant speed. C) Velocity of a moving object is the distance traveled divided by the time needed to travel the distance. D) If a moving object slows down, it is accelerating. 3.
The strength of the gravitational force between two objects depends on which of the following?A) the mass of the larger object B) the mass of the objects and the distance between them C) the velocities of the objects D) the orbits of the objects 4.
Forces that cancel each other are called __________ forces.A) inactivated B) balanced C) null D) neutral 5.
A change in motion is described by __________.A) speed B) inertia C) acceleration D) net force 6.
Which of the following is not an acceleration?A) stopping your bike at an intersection B) riding your bike straight down the street at a constant speed C) riding your bike faster when you head down a hill D) slowing your bike ride so you can make it up a hill 7.
A ball is thrown straight up in the air. According to Newton's first law of motion, what is the reason for the ball falling back to Earth?A) A force has acted on it. B) The change in the ball's acceleration is proportional to the force acting on it. C) The ball exerts a force on the air surrounding it. D) It is accelerating in the same direction as Earth's gravitational force on it. 8.
Newton's second law of motion states that __________.A) an object will remain at rest or keep moving in a straight line with constant speed unless a force acts on it B) the force on an object can be found by dividing its mass by its acceleration C) acceleration is calculated by dividing the force exerted on an object by the mass of the object, and that when a force acts on an object, its acceleration is in the same direction as the force D) when a force is applied on an object, there is an equal force applied by the object in the opposite direction 9.
Newton's first law of motion states that __________.A) when a force is applied on an object, there is an equal force applied by the object in the opposite direction B) when a force acts on an object, its acceleration is in the same direction as the force C) an object will remain at rest or keep moving with a constant velocity unless a force acts on it D) acceleration is calculated by dividing the force exerted on an object by the mass of the object 10.
When unbalanced forces act on an object, __________.A) the object accelerates B) friction becomes greater than the net force C) the object speeds up D) the net force is zero