What is the SI unit of force?

• Newton (N)

• Joule (J)

• Watt (W)

• Pascal (Pa)

• Ohm (Ω)

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Physics in everyday life

Which of the following best describes Newton's First Law of Motion?

• An object at rest tends to stay at rest, and an object in motion tends to stay in motion unless acted upon by an external force.

• The force of an object is equal to its mass times acceleration.

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

• The velocity of an object is directly proportional to the net force acting on it.

• The momentum of an object is conserved.

If a 10 kg object experiences a force of 20 N, what is its acceleration?

• 5 m/s²

• 0.5 m/s²

• 200 m/s²

• 2 m/s²

• 10 m/s²

When two forces act in opposite directions on an object, and their magnitudes are equal, what is the net force?

• Zero

• The sum of the forces

• The difference between the forces

• The square of the forces

• The average of the forces

Which of the following is an example of a contact force?

• Gravitational force

• Magnetic force

• Frictional force

• Electrostatic force

• Tension in a rope

A 500 kg car is accelerating at 2 m/s². What is the force required to achieve this acceleration?

• 100 N

• 50 N

• 1000 N

• 250 N

• 2000 N

Which law of motion is often described as 'Action and reaction are equal and opposite'?

• Newton's First Law

• Newton's Second Law

• Newton's Third Law

• Hooke's Law

• Kepler's Law

When an object is in equilibrium, what can you say about the net force acting on it?

• The net force is unpredictable.

• The net force is constant.

• The net force is equal to the weight of the object.

• The net force is always maximum.

• The net force is zero.

If you push a book along a table with a 10 N force and the book does not move, what can you conclude about the frictional force?

• The frictional force does not exist.

• The frictional force is less than 10 N.

• The frictional force is greater than 10 N.

• The frictional force is equal to 10 N.

• The frictional force is in the opposite direction of the applied force.

On which planet in our solar system would you weigh the most due to its strong gravitational pull?

• Earth

• Venus

• Mars

• Neptune

• Jupiter