Newton's Second Law of Motion

What is the difference between speed and velocity?

• Speed is a scalar quantity that refers to how fast an object is moving, while velocity is a vector quantity that includes both speed and direction.

• Speed and velocity are the same; both refer to how fast an object is moving.

• Velocity is a scalar quantity that refers to how fast an object is moving, while speed is a vector quantity that includes both speed and direction.

• Speed is a vector quantity that includes both speed and direction, while velocity is a scalar quantity that refers to how fast an object is moving.

How do you calculate force using mass and acceleration?

• Force (F) is calculated using the formula F = ma, where m is mass and a is acceleration.

• Force is calculated by dividing mass by acceleration.

• Force is the product of mass and velocity.

• Force can be calculated by adding mass and acceleration.

What is the formula for calculating acceleration?

• a = F/m

• a = m/F

• a = F*m

• a = F + m

What happens to the velocity of an object when a force is applied in the same direction as its motion?

• The object's velocity decreases, meaning it will go slower.

• The object's velocity remains the same, meaning it will not change speed.

• The object's velocity increases, meaning it will go faster.

• The object's velocity becomes zero, meaning it stops moving.

What is Newton's Second Law of Motion?

• The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass (F = ma).

• An object in motion stays in motion unless acted upon by an external force.

• The force acting on an object is equal to the mass of that object multiplied by its acceleration (F = ma).

• For every action, there is an equal and opposite reaction.

What is inertia?

• The force that causes an object to move in a circular path.

• The tendency of an object to resist changes in its state of motion.

• The speed at which an object travels in a straight line.

• The mass of an object multiplied by its velocity.

True or False: An object's velocity can be changed by changing its speed, its direction, or both.

• True

• False

• Only by changing speed

• Only by changing direction

What is the effect of a net force of zero on an object's motion?

• The object will accelerate in the direction of the net force.

• The object will remain at rest or continue to move at a constant velocity.

• The object will come to a stop immediately.

• The object will change direction randomly.

What does it mean for an object to be in free fall?

• An object in free fall is only under the influence of gravity, with no other forces acting on it.

• An object in free fall is moving horizontally at a constant speed.

• An object in free fall is experiencing air resistance that affects its motion.

• An object in free fall is being propelled by an external force.

If an object has a mass of 2,100 kg and accelerates at 7 m/s², what is the force acting on it?

• 12,000 N

• 14,700 N

• 15,000 N

• 10,500 N