Force & Motion

What type of force is responsible for the acceleration of an object sliding down an inclined plane?

• Gravitational force

• Normal force

• Frictional force

• Applied force

According to Newton's first law of motion, what will happen to an object at rest if no net force acts on it?

• It will move at a constant velocity.

• It will start moving in a random direction.

• It will remain at rest.

• It will accelerate.

Newton's second law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. What is the formula that represents this law?

• F = m/a

• a = F/m

• F = ma

• a = m/F

Which of the following is an example of Newton's third law of motion?

• A ball rolling down a hill.

• A rocket launching into space.

• An apple falling from a tree.

• A book resting on a table.

What is the force called that acts on a body moving in a circular path and is directed toward the center around which the body is moving?

• Centripetal force

• Gravitational force

• Magnetic force

• Electrostatic force

If you push against a wall, the wall pushes back with an equal and opposite force. This is an example of which of Newton's laws?

• First law

• Second law

• Third law

• None of the above

What is the unit of force in the International System of Units (SI)?

• Joule

• Pascal

• Newton

• Watt

If the mass of an object is constant, and a constant force is applied to it, what will happen to the acceleration?

• It will decrease.

• It will increase.

• It will remain constant.

• It cannot be determined.

What is momentum?

• The force applied to an object

• The product of an object's mass and its velocity

• The rate of change of an object's position

• The resistance of an object to a change in its state of motion

Which of the following is a contact force?

• Gravitational force

• Magnetic force

• Frictional force

• Electric force