Posted by **Maggie** on Thursday, March 29, 2012 at 4:29pm.

Each of the four wheels of a car push on the road with a force of 4.0*10^3 N [down]. The driving force on the car is 8.0*10^3 N [W]. The fictional resistance on the car is 6.0*10^3 [E]. Calculate the following

A) the mass of the car

B) the net force on the car

C) the cars acceleration

The answers are

A) 1.6*10^3 kg

B) 2.0*10^3 N [W]

C) 1.2m/s^2

I just don't understand how to get these correct answers

- physics -
**Elena**, Thursday, March 29, 2012 at 5:48pm
M•g =4•m•g= 4•4•10^3 N

M = 4•4•10^3/9.8 =1.63•10^3 kg

There are 4 forces: Mg (downwards), normal force N ( upwards), driving force(to the left), and resistance force (to the right) . Net force is their sum.

Since N=Mg, net force is 8•10^3 – 6•10^3 = 2•10^3 N (to the left).

Acceleration = net force/mass =2•10^3/1.63•10^3 = 1.23 m/s^2

## Answer This Question

## Related Questions

- PHYSICS - You are driving a car down a straight road at a constant 48 miles per ...
- physics - The wheels of a midsize car exert a force of 2100 N backward on the ...
- Physics - A CAR HAS A MASS OF 1200KG TRAVELLING ON A LEVEL ROAD. THE CAR ...
- Physics - A car is driving on a level highway. It is acted upon by the following...
- MATH - A car is towing a trailer along a horizontal straight road using a ...
- Physics Help, Please! - When a car goes around a curve (without skidding), on a...
- physics - a car of the mass m kg travels on a straight,level road. the driving ...
- Physics help - A car travels in a circle whose radius is 31 m, with a speed of ...
- PHYSICS - A 900 kg car pushes a 1900 kg truck that has a dead battery. When the ...
- Physics - A 1100 kg car is moving toward the north along a straight road at a ...

More Related Questions