174 Answered Questions for the topic Forces

Forces

04/18/18

Why is it difficult to ride a bike against the wind?
I am studying about forces and having trouble with this problem.
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02/19/18

Mechanics Question - Finding speed reduction time
A car of mass 1000 kg has its speed reduced from 81 km/h to 54 km/h by brakesproducing a force of 1250 N. How long does this take? Determine the work done bythe brakes on the car. Determine... more
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01/21/18

Force of the charge
Two charges of 10-6 C are located 1cm apart (a) What is the force on a charge +10-8 halfway between them? (b) What is the force on a charge of -10-8 C at the same place?  
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01/18/18

Physics Power and Work
A 49kg bicycle rider delivers an average of 0.28 hp. The mass of the bicycle is 2.1kg and the hill she is climbing is 245m tall. How much time will this take?
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Forces Physics Friction

12/14/17

Forces on inclines
Why is it easier to pull an object up an incline rather than pushing?
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12/14/17

A 2kg block is resting on a rough incline which is at a 30 degree angle.
Which is larger, the normal force or the force of friction?
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12/11/17

Newton's law in 2D
A 1.5 kg book is held against the wall by an applied force. The applied force is 60° above the horizontal. Given that the static coefficient of friction between the block and the wall of 0.65,... more
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12/05/17

How do i use the energy equation to answer the question below?
A particle of mass m = 10kg moves along a straight line under the action of force F =λ/x4, where λ is some constant. A measurement shows that the particle passes the pointx = 1m with the velocity... more
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11/18/17

Find the acceleration of the books:
A Student moves a box of books with a rope by pulling the rope with a force of 90 N at an angle of 30°.   The books have a mass of 20 kg and a coefficient of friction between the box and floor is... more
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11/16/17

Newton's gravity and weight qs
An astronaut has a mass of 80 kg, but on an unknown planet, the bathroom scale reads 15 kg when the astronaut stands on it. What is the astronaut's weight and the gravitational field strength on... more
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Forces

11/13/17

can someone tell me how to solve this?
A block of mass 7.33 kg lies on a frictionlesshorizontal surface. The block is connected bya cord passing over a pulley to another blockof mass 2.45 kg which hangs in the air, asshown. Assume the... more
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Forces

11/13/17

What is the force on the skier parallel to the slope? The acceleration of gravity is 9.8 m/s 2 . Answer in units of N.
A skier of mass 87.8 kg comes down a slopeof constant angle 44◦ with the horizontal.What is the force on the skier parallel to theslope? The acceleration of gravity is 9.8 m/s2.Answer in units of N.
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Forces

09/23/17

What is the friction force
A 25 kg wooden crate is being pushed against a large spring with a spring constant of 1200 N/m. If the coefficient of friction between the crate and the ground is 0.68, how much does the spring... more
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Forces Physics Momentum

07/24/17

Dynamics and Forces - Conservation of Momentum
After a 1.30 x 10^2kg astronaut (incl. equipment) connects a safety line (length = 22.0m) to herself and to the spacecraft (mass = 2.80 x 10^3kg), she pushes against the craft and moves away at a... more
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07/20/17

Force between two objects
The force of gravity between two small masses A and B when placed very near each other is 3.24x10^-7 N. What will the force between these objects be if both of their masses are doubled and the... more
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Forces Physics

06/27/17

A 1 kg model rocket is launched at a 30 degree angle from the floor.
A 1 kg model rocket is launched at a 30 degree angle from the floor. The small rocket burns for 5.00 s and has a steady thrust of 20.0 N. What maximum altitude does the rocket reach and range of... more
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03/16/17

Impulse and force
I've been stuck on this question forever and I keep getting it wrong :( Please help!   A truck of mass 3 tonnes is travelling at 105km/h when it hits a car of mass 1.5 tonne travelling in the... more
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02/14/17

Calculating momentum, velocity, impulse and force.
A car (m=900kg) travelling at 70km/h hits a pedestrian (m=60kg) who is travelling at 1m/s in the same direction. After the collision the car has a velocity of 30km/h in the same direction it was... more
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01/31/17

Calculating forces given mass, acceleration and time
A 650kg car travelling 5m/s1 NORTH EAST turns so that it is travelling 4m/s1 NORTH in 2 seconds. Calculate the magnitude of the force required to make such a turn.
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Forces Science Physics

01/31/17

Calculating the net force given velocity, acceleration and a frictional force.
A 1t car initially travelling at 60kmh^-1 experiences a force of 1000N from the engine, and a frictional force of 130N in the opposite direction. A) Calculate the net force on the car. B) If the... more
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Forces

01/09/17

calculating mass
A net force acts on mass m1 and creates an acceleration.A mass m2 is added to mass m1.The same net force acting on two mass together creates one-third the acceleration.Determine the ratio m2/m1
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10/30/16

equilibrium of turning moments
https://postimg.org/image/m5vobypg3/
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10/14/16

A 50N sofa is inclined on a ramp at 250. Both µk and µs are 0.6
a.) What is the smallest force parallel to the incline needed to keep the sofa from sliding down? b.) What parallel force is required to keep the sofa moving up the incline at a constant speed?c.)... more
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09/27/16

Motion and Force doubt
When I calculating resultant force in equilateral triangle why there is square root vector formula we will put?
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05/29/16

Decreasing Centripetal Force
You are a roller coaster engineer, and safety inspectors tell you that your roller coaster has too much centripetal force. What can you do to decrease the centripetal foce acting on your roller... more
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