Dynamics Learning Quizzes: Master Newton's Laws and Motion

Question 1

A block of mass 5 kg is placed on a horizontal frictionless surface. A force of 20 N is applied to the block for 4 seconds. Calculate the displacement of the block in meters (m).

Accepted Answer

10 m

Answer

5 m

Answer

20 m

Answer

40 m

Question 2

A spring of spring constant 100 N/m is stretched by 0.2 m. Calculate the energy stored in the spring in Joules (J).

Accepted Answer

2 J

Answer

1 J

Answer

4 J

Answer

8 J

Question 3

Which of these is NOT a Newton's law of motion?

Accepted Answer

Every object attracts every other object with a force proportional to their masses and inversely proportional to the square of the distance between them.

Answer

An object at rest remains at rest unless acted upon by an external force.

Answer

The rate of change of momentum of an object equals the net force acting on it.

Answer

Every action has an equal and opposite reaction.

Question 4

A ball is thrown vertically upwards with a velocity of 10 m/s. What's its maximum height?

Accepted Answer

5 m

Answer

2.5 m

Answer

10 m

Answer

20 m

Question 5

A car travels 100 km in 2 hours. What's its average speed?

Accepted Answer

50 km/h

Answer

25 km/h

Answer

75 km/h

Answer

100 km/h

Question 6

Which of these is a unit of force?

Accepted Answer

Newton

Answer

Joule

Answer

Watt

Answer

Pascal

Question 7

A ball is thrown vertically upward with a velocity of 15 m/s. What is its maximum height (in meters) reached before falling back down?

Accepted Answer

22.5 m

Answer

11.25 m

Answer

33.75 m

Answer

45 m

Question 8

Which of the following is a scalar quantity?

Accepted Answer

Temperature

Answer

Displacement

Answer

Velocity

Answer

Acceleration

Question 9

Which of the following forces is a non-contact force?

Accepted Answer

Gravitational force

Answer

Friction

Answer

Tension

Answer

Normal force

Question 10

The coefficient of restitution for a perfectly elastic collision is:

Accepted Answer

1

Answer

0.5

Answer

0

Answer

-1

Question 11

Which of the following forces is conservative?

Accepted Answer

Gravitational force

Answer

Air resistance

Answer

Frictional force

Answer

Tension force

Question 12

What is the unit of momentum?

Accepted Answer

kg m/s

Answer

W

Answer

N

Answer

J

Question 13

Which of the following quantities is a scalar?

Accepted Answer

Speed

Answer

Force

Answer

Acceleration

Answer

Energy

Question 14

Which of the following forces is a fundamental force of nature?

Accepted Answer

Gravitational force

Answer

Normal force

Answer

Frictional force

Answer

Tension force

Question 15

A block of mass 2 kg is moving with a velocity of 4 m/s. Calculate its momentum.

Accepted Answer

8 kg m/s

Answer

4 kg m/s

Answer

16 kg m/s

Answer

2 kg m/s

Question 16

Identify the force that is NOT conservative:

Accepted Answer

Friction

Answer

Gravity

Answer

Elastic potential energy

Answer

Electrical force

Question 17

Define the work done by a force F acting on an object over a displacement d in the direction of the force.

Accepted Answer

W = Fd

Answer

W = d/F

Answer

W = F/d

Answer

W = F^2d

Question 18

A spring is stretched by 10 cm. Calculate the potential energy stored in the spring if its spring constant is 100 N/m.

Accepted Answer

5 J

Answer

20 J

Answer

10 J

Answer

40 J

Question 19

Define impulse.

Accepted Answer

I = Ft

Answer

I = F/t

Answer

I = t/F

Question 20

A spring has a spring constant of 100 N/m. How much force is needed to stretch it by 0.1 m?

Accepted Answer

10 N

Answer

5 N

Answer

20 N

Answer

15 N

Question 21

A particle with a mass of 0.5 kg moves in a circle with a radius of 2 m at a constant speed of 10 m/s. What is the magnitude of the centripetal force acting on the particle?

Accepted Answer

25 N

Answer

12.5 N

Answer

37.5 N

Answer

50 N