89 Answered Questions for the topic Mechanics

05/21/22

Question about harmonic oscillation of a pendulum clock

A pendulum clock - is a clock that uses a pendulum, a swinging weight, as its timekeeping element.Pendulum's amplitude of oscillation decreases with the stretching of the spring. How does the... more

04/24/22

Linear velocity problem

The diameter of the back wheel of a tricycle is 1.5 times longer than the front wheel's diameter. When the tricycle is moving, the surface points of the back wheel move with the linear velocity of... more

03/06/22

Compare momentum of different moving objects

Two objects of the same volume, one is made of steel, the other is made of lead, are moving with the same velocity. Compare their momentum. The answer: the momentum of the lead object is 1.5 times... more

03/06/22

Find momentum given a motion equation

Given a motion equation x=5-8t+4t2, and the object of 2 kg mass, find its momentum after 2 s and 4 s. What is the average force?Answers: 16 kg*m/s, 48 kg*m/s, 16 N
Mechanics Physics Ap Physics

02/20/22

What will be the velocity of initially still cart of mass M, after someone of mass m jumped on it with velocity v0?

How to derive v for this problem?
Mechanics Science Physics

01/16/22

What are the examples that prove that interaction between different bodies is due to the acceleration, not the motion itself.

What are the examples that prove that interaction between different bodies is due to the acceleration, not the motion itself.
Mechanics Science Physics

01/16/22

Balls moving against each other

Ball made of steel and ball made of aluminum move against each other, one time both with 4 m/s, another time both with 2 m/s. Compare the ratio of accelerations and explain your answer.
Mechanics Science Physics

01/16/22

Question about inertia and frames of reference

A ball inside a truck is not moving. Will the first Newton's law hold as seen by the observer inside the truck, if the truck suddenly accelerated forward? Explain your answer. Is this frame of... more

Question on Dynamics. Finding the force

A man of 75kg is standing in the basket of a hot-air balloon. The balloon is rising at 5ms-1 and 4s later it is descending at 3ms-1. Assuming constant acceleration, find the normal contact force of... more

01/05/22

Push away problem

An 80 kg astronaut floating in space is 30 m away from his spaceship. He wants to return to his spaceship in 10 s. With how much speed must he throw his 2 kg space hammer, directly away from the... more

01/04/22

Generic physics knowledge test

An apple, a metal ball, and a paper is falling in a vacuum. Which one has the greatest acceleration?

01/03/22

Velocity of a bus during 12 s uniformly increased from 10 m/s to 15 m/s. Find the average velocity during 12 s

Velocity of a bus during 12 s uniformly increased from 10 m/s to 15 m/s. Find the average velocity of a bus during 12 s
Mechanics Physics Physics C

12/04/21

Basic Newtons Laws problem

Force F is applied to the front block (as shown below) in order for all three blocks to move at a constant velocity. All horizontal surfaces have a coefficient of friction of µ. What is the ratio... more

11/06/21

Question about the weight of an object in water

A rod made of aluminum is submerged in water. Water density is 1000 kg/m3, aluminum density is 2700 kg/m3. How many times the weight of the rod is greater in the air than in water. Correct answer:... more
Mechanics Physics Kinematics

11/06/21

Uniform acceleration

The velocity of a bus uniformly increased from 10 m/s to 15 m/s during 12 seconds. Find the average velocity of the bus during the first 12 seconds. Answer: 12,50 m/s

Spring Constant & Oscillatory Motion

A 500.0 gram mass is hung from a spring having a spring constant of 50.0 N/m. a) How much does the spring stretch when the mass is at rest and it is not oscillating? This is called the equilibrium... more

09/21/21

Short basic physics knowledge question

The resultant force of all forces acting on the body is opposite to the direction of velocity. How the body is moving?Four possible choices:A) Speeding upB) Slowing downC) UniformlyD) It is not... more

08/04/21

The force acting upon the spring to compress it by 3 cm is equal to 20 N. What is the work when compressing the spring

The force acting upon the spring to compress it by 3 cm is equal to 20 N. What is the work when compressing the spring

08/04/21

Momentum and kinetic energy

It is known that the momentum of the object is 8 kg*m/s and the kinetic energy is equal to 16 J. What is the mass and velocity of the object?

08/04/21

Physics problem: find work

A sled of mass 10 kg went down from a hill of height 5 m and stopped at the horizontal part of a road. Find the work done when dragging the sled up the hill. Answer is 1000 J

07/30/21

Interesting centre of gravity problem

Tom has cut the right end of a uniform shaft of 40 cm in length. How much and to which direction the center of gravity of the remaining shaft moved? The answer is 20 cm to the left.

07/29/21

Gravitational force between two objects

How will gravitational force between two objects change when one of the objects adds 3 times more mass and moves further 3 times the original distance

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