Motion and Forces: Master the Fundamentals of Physics

Question 1

A solid sphere rolls across a flat, horizontal surface and gradually slows down. Which type of friction acts on the sphere, and how does it affect its motion?

Accepted Answer

Rolling friction, which opposes the sphere's rolling motion and causes it to slow down.

Answer

Static friction, which prevents the sphere from moving.

Answer

Kinetic friction, which opposes the sphere's sliding motion and allows it to roll smoothly.

Answer

Sliding friction, which causes the sphere to skid across the surface.

Question 2

A ball is thrown vertically upward with an initial velocity of 10 m/s. What is its velocity at the highest point of its trajectory?

Accepted Answer

0 m/s

Answer

10 m/s

Answer

20 m/s

Answer

Its velocity cannot be determined from the given information

Question 3

A lever is a simple machine that consists of a beam pivoted on a fixed point. What is the principle that governs the operation of a lever?

Accepted Answer

Law of moments

Answer

Law of conservation of energy

Answer

Law of conservation of momentum

Answer

Law of universal gravitation

Question 4

Which of the following is a unit of power?

Accepted Answer

Watt

Answer

Joule

Answer

Newton

Answer

Pascal

Question 5

Which of the following is a scalar quantity?

Accepted Answer

Displacement

Answer

Velocity

Answer

Acceleration

Answer

Force

Question 6

An object is in equilibrium when the net force acting on it is:

Accepted Answer

Zero

Answer

Non-zero but constant

Answer

Non-zero and increasing

Answer

Non-zero and decreasing

Question 7

Which of the following is NOT a type of gear?

Accepted Answer

Belt drive

Answer

Spur gear

Answer

Helical gear

Answer

Worm gear

Question 8

What is the primary purpose of a pulley?

Accepted Answer

To change the direction of a force

Answer

To increase the magnitude of a force

Answer

To decrease the magnitude of a force

Answer

To store energy

Question 9

Which of the following is NOT a valid unit of force?

Accepted Answer

Joule

Answer

Newton

Answer

Kilogram-force

Answer

Pascal

Question 10

According to Newton's Second Law of Motion, the acceleration of an object is directly proportional to:

Accepted Answer

Force applied

Answer

Mass of the object

Answer

Square of the force applied

Answer

Time taken for motion

Question 11

A ball is thrown vertically upwards. At the highest point of its trajectory, which of the following is zero?

Accepted Answer

Velocity

Answer

Acceleration due to gravity

Answer

Displacement

Answer

Potential energy

Question 12

Which of the following is the SI unit of energy?

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Pascal

Question 13

Which of the following is NOT a type of friction?

Accepted Answer

Magnetic attraction

Answer

Static friction

Answer

Kinetic friction

Answer

Rolling friction

Question 14

In circular motion, the centripetal force is directed:

Accepted Answer

Towards the center of the circular path

Answer

Away from the center of the circular path

Answer

Tangential to the circular path

Answer

Perpendicular to the circular path

Question 15

Which of the following is a vector quantity?

Accepted Answer

Velocity

Answer

Distance

Answer

Mass

Answer

Temperature

Question 16

Which of the following is a scalar quantity?

Accepted Answer

Speed

Answer

Velocity

Answer

Acceleration

Answer

Force

Question 17

What is the SI unit of energy?

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Kilogram

Question 18

Which of the following is a simple machine?

Accepted Answer

Lever

Answer

Electric motor

Answer

Car engine

Answer

Computer

Question 19

What is the primary purpose of using a pulley in a mechanical system?

Accepted Answer

To change the direction of a force

Answer

To amplify force

Answer

To increase speed

Answer

To reduce friction

Question 20

What is the relationship between torque and angular acceleration?

Accepted Answer

Torque is directly proportional to angular acceleration.

Answer

Torque is inversely proportional to angular acceleration.

Answer

Torque is independent of angular acceleration.

Answer

The relationship between torque and angular acceleration is non-linear.

Question 21

Which of the following is a vector quantity?

Accepted Answer

Velocity

Answer

Mass

Answer

Volume

Answer

Temperature

Question 22

What is the definition of work done by a force?

Accepted Answer

The force applied to an object multiplied by the displacement of the object in the direction of the force

Answer

The force applied to an object multiplied by the displacement of the object perpendicular to the force

Answer

The force applied to an object divided by the displacement of the object in the direction of the force

Answer

The force applied to an object divided by the displacement of the object perpendicular to the force

Question 23

A car travels at a steady 10 meters per second for 5 seconds. What is the car's acceleration?

Accepted Answer

0 m/s²

Answer

10 m/s²

Answer

5 m/s²

Answer

2 m/s²

Question 24

According to Newton's first law of motion, what happens to an object at rest when no unbalanced force acts upon it?

Accepted Answer

It remains at rest.

Answer

It changes direction.

Answer

It accelerates.

Answer

It moves with constant velocity.

Question 25

Momentum is a vector quantity that remains constant in closed systems. True or False?

Accepted Answer

True

Answer

Only if all forces are conservative

Answer

Only if the net force is zero

Answer

False

Question 26

What is the relationship between work done and change in kinetic energy?

Accepted Answer

Work done is equal to the change in kinetic energy.

Answer

Work done is proportional to the change in kinetic energy.

Answer

Work done is independent of the change in kinetic energy.

Answer

Work done is the opposite of the change in kinetic energy.

Question 27

Define power.

Accepted Answer

Power is the rate at which work is done.

Answer

Power is the distance moved by an object.

Answer

Power is the amount of work done.

Answer

Power is the force applied to an object.

Question 28

What is circular motion?

Accepted Answer

Circular motion is the movement of an object along a circular path around a fixed point.

Answer

Circular motion is the movement of an object from side to side.

Answer

Circular motion is the movement of an object along a straight line.

Answer

Circular motion is the movement of an object up and down.

Question 29

Friction is a force that:

Accepted Answer

Opposes the relative motion of two surfaces in contact.

Answer

Assists the relative motion of two surfaces in contact.

Answer

Acts only on objects that are at rest.

Answer

Acts only on objects that are moving.

Question 30

Define equilibrium.

Accepted Answer

Equilibrium is a state in which the net force acting on an object is zero.

Answer

Equilibrium is a state in which the object is moving with constant velocity.

Answer

Equilibrium is a state in which the object is at rest.

Answer

Equilibrium is a state in which the object is accelerating.

Question 31

What are moments?

Accepted Answer

Moments are forces that tend to rotate an object about a fixed point.

Answer

Moments are forces that tend to stop an object from moving.

Answer

Moments are forces that tend to move an object in a straight line.

Answer

Moments are forces that tend to change the shape of an object.

Question 32

What is the function of gears?

Accepted Answer

Gears transmit motion and torque between shafts.

Answer

Gears decrease the speed of a shaft.

Answer

Gears increase the speed of a shaft.

Answer

Gears change the direction of rotation of a shaft.

Question 33

Which of the following is a vector quantity?

Accepted Answer

Velocity

Answer

Time

Answer

Distance

Answer

Mass

Question 34

A ball is thrown vertically upwards with a velocity of 10 m/s (meters per second). What is the maximum height attained by the ball?

Accepted Answer

5 m (meters)

Answer

10 m (meters)

Answer

20 m (meters)

Question 35

A lever is a simple machine made of a rigid bar pivoted on a fixed point. What is the formula for calculating the mechanical advantage of a lever?

Accepted Answer

Mechanical Advantage (MA) = Effort arm / Load arm

Answer

MA = Load arm / Effort arm

Answer

MA = Effort arm + Load arm

Question 36

Which of the following is NOT a law of thermodynamics?

Accepted Answer

The total entropy of a closed system always decreases

Answer

Heat cannot flow spontaneously from a colder object to a hotter object

Answer

The total energy of a closed system is always constant

Question 37

A heat engine is a device that converts heat into mechanical energy. How do you calculate its efficiency?

Accepted Answer

Efficiency = (Work output / Heat input) x 100%

Answer

Efficiency = (Heat input - Work output) x 100%

Answer

Efficiency = (Work output - Heat input) x 100%

Question 38

An object is thrown vertically upwards. Which of the following graphs best represents its velocity-time graph?

Accepted Answer

A parabolic curve with a positive slope initially, changing to a negative slope at the peak, returning to zero at maximum height, and then becoming negative as the object falls back to the ground.

Answer

A straight line with a positive slope

Question 39

Which of the following forces is responsible for keeping an object moving in a circular path?

Accepted Answer

Centripetal force

Answer

Frictional force

Answer

Tension force

Answer

Gravitational force

Question 40

A lever is a simple machine consisting of a rigid bar pivoted on a fixed point. Which of the following is the correct equation for the moment of a force?

Accepted Answer

Moment = Force × Perpendicular Distance from Pivot

Answer

Moment = Force × Mass

Answer

Moment = Force × Time

Answer

Moment = Force × Distance Moved

Question 41

Which of Newton's laws of motion describes the relationship between force, mass, and acceleration?

Accepted Answer

F = ma

Answer

E = mc²

Answer

a = vt

Answer

F = mg

Question 42

Which of the following is a scalar quantity?

Accepted Answer

Speed

Answer

Acceleration

Answer

Velocity