Forces

Identify which of the following statements is Newton's 1st law of motion.

• The acceleration of an object is directly proportional to the force applied and inversely proportional to its mass.

• Whenever one object exerts a force on a second object, the second object exerts a force on the first object of equal magnitude in the opposite direction.

• An object remains at rest or in uniform motion in a straight line unless acted upon by an external force.

Identify which of the following statements is Newton's 2nd law of motion.

• The acceleration of an object is directly proportional to the force applied and inversely proportional to its mass.

• Whenever one object exerts a force on a second object, the second object exerts a force on the first object of equal magnitude in the opposite direction.

• An object remains at rest or in uniform motion in a straight line unless acted upon by an external force.

Identify which of the following statements is Newton's 3rd law of motion.

• The acceleration of an object is directly proportional to the force applied and inversely proportional to its mass.

• Whenever one object exerts a force on a second object, the second object exerts a force on the first object of equal magnitude in the opposite direction.

• An object remains at rest or in uniform motion in a straight line unless acted upon by an external force.

Which of Newton's laws of motion is best exemplified in this animated GIF?

• Newton's 1st Law

• Newton's 2nd Law

• Newton's 3rd Law

Which of Newton's laws of motion is best exemplified in this animated GIF?

• Newton's 1st Law

• Newton's 2nd Law

• Newton's 3rd Law

A force of 20 N is applied to an object of mass 5 kg in order to keep it moving at constant velocity against a constant resistive force. Which of the following gives the net force exerted on the object?

• 0 N

• 4 N

• 20 N

• 100 N

In which one of the following situations are the forces acting on the object balanced?

• A skydiver reaches terminal velocity and falls at constant speed 55 m/s.

• While falling freely a ball experiences a constant downward acceleration of 9.8 m/s².

• A car decelerates at a constant rate of 4 m/s² until it comes to rest.

• An airplane makes a turn moving at a constant speed of 120 m/s.

An identical force F is applied to two objects with different masses. Indicate below which mass experiences a greater acceleration.

• The one with more mass

• The one with less mass

• They both experience an equal acceleration

• Cannot be determined

A 12 newton net force accelerates an object at 4 m/s². Which of the following gives the mass of the object?

• 0.33 kg

• 3 kg

• 8 kg

• 48 kg

A 1 000 kg car accelerates on a straight, flat, horizontal road with acceleration 0.3 m/s². The driving force F on the car is opposed by a resistive force of 500 N. Which of the following gives the magnitude of the net force on the car?

• 200 N

• 300 N

• 500 N

• 800 N