Newton's First and Second Laws

Newton's first law of motion states that __________.

• when a force is applied on an object, there is an equal force applied by the object in the opposite direction
• for every action, there is an equal and opposite reaction
• every object will continue in its state of rest or uniform motion in a straight line unless a resultant force acts on it 
• acceleration is calculated by dividing the force exerted on an object by the mass of the object

Forces that totally cancel each other are called __________ forces

• inactivated
• balanced
• null
• neutral

According to Newton’s first law of motion, a moving object that is not acted on by an unbalanced force will _____________ .

• remain in motion.
• eventually come to a stop.
• change its momentum.
• accelerate.

A box lies at rest on a perfectly smooth surface. Taylor pushes the box momentarily. Describe the subsequent motion of the box.

• Moves with constant speed in a straight line
• Decelerates uniformly to rest
• Cannot be determined as magnitude of force is not given
• Moves with increasing speed in a straight line

Newton's second law of motion states that __________

• every object will continue in its state of rest or uniform motion in a straight line unless a resultant force acts on it 
• the force on an object can be found by dividing its mass by its acceleration
• when a resultant force acts on an object of a constant mass, the object will accelerate in the direction of the resultant force
• for every action, there is an equal and opposite reaction

Friction is a force that acts ___________ .

• in the same direction as the force
• in the opposite  direction of the force
• perpendicular to the force
• upwards only

Neglecting friction, which item needs a greater net force to move on a horizontal table, a kilogram of feathers or a kilogram of iron? 

• Feathers 
• Iron
• They both require the same amount of force
• Neither will move

What is the net force of this object? 

• 10 N, no direction
• 10 N, left
• 5 N, right
• 0 N, no direction

If a 10 kg object accelerates at 15 m/s², determine the resultant force.

• 150 N
• 15 N
• 150 kg
• 100 kg

An object accelerates at 10 m/s². If a force of 10 N was required to accelerate it, determine the object's mass.

• 1 kg
• 10 kg
• 2 kg
• 5 kg