P8 Forces

Question 1

What is the definition of force?

Answer 1

A force is a push or pull acting on an object.

Question 2

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

Answer 2

The unit of force is the Newton (N).

Question 3

True or False: Force can only act when objects are in contact.

Answer 3

False.

Question 4

Fill in the blank: The formula for calculating force is ___ = mass × acceleration.

Answer 4

force

Question 5

What is the relationship between mass and weight?

Answer 5

Weight is the force exerted by gravity on an object’s mass.

Question 6

What is gravitational force?

Answer 6

Gravitational force is the attraction between two masses due to gravity.

Question 7

Which law states that an object will remain at rest or in uniform motion unless acted upon by a net external force?

Answer 7

Newton’s First Law of Motion.

Question 8

What does Newton’s Second Law of Motion state?

Answer 8

Acceleration is produced when a force acts on a mass; the greater the mass, the greater the amount of force needed.

Question 9

What is the formula for calculating weight?

Answer 9

Weight = mass × gravitational acceleration.

Question 10

True or False: An object in motion will eventually come to rest without any external force acting on it.

Answer 10

True.

Question 11

What is friction?

Answer 11

Friction is the resistance that one surface or object encounters when moving over another.

Question 12

What are the two main types of friction?

Answer 12

Static friction and kinetic (sliding) friction.

Question 13

Fill in the blank: The force that opposes the motion of an object is called ___.

Answer 13

friction

Question 14

What is the principle of conservation of momentum?

Answer 14

In a closed system, the total momentum before an event is equal to the total momentum after the event.

Question 15

What is the difference between balanced and unbalanced forces?

Answer 15

Balanced forces do not change the motion of an object, while unbalanced forces cause a change in motion.

Question 16

What is air resistance?

Answer 16

Air resistance is a type of friction that acts against the motion of an object moving through the air.

Question 17

True or False: The greater the surface area of an object, the less air resistance it experiences.

Answer 17

False.

Question 18

What is tension force?

Answer 18

Tension force is the force transmitted through a string, rope, or wire when it is pulled tight.

Question 19

What is the net force acting on an object?

Answer 19

The net force is the vector sum of all the forces acting on an object.

Question 20

Fill in the blank: The force that keeps an object moving in a circular path is called ___.

Answer 20

centripetal force

Question 21

What is the effect of increasing mass on the gravitational force between two objects?

Answer 21

Increasing mass increases the gravitational force between the objects.

Question 22

What is a free-body diagram?

Answer 22

A free-body diagram is a visual representation of the forces acting on an object.

Question 23

What is the role of the normal force?

Answer 23

The normal force acts perpendicular to the surface and supports the weight of an object resting on it.

Question 24

True or False: All forces are vector quantities.

Answer 24

True.

Question 25

What is the formula for calculating acceleration?

Answer 25

Acceleration = change in velocity / time taken.

Question 26

What is the effect of friction on motion?

Answer 26

Friction opposes motion and can slow down or stop moving objects.