1) A car is driving on a level highway. It is acted upon by the following forces

Question

1) A car is driving on a level highway. It is acted upon by the following forces: a downward gravitational force of 12 kN, an upward contact force due to the road of 12 kN, another contact force due to the road of 7 kN directed west, and a drag force due to air resistance of 5 kN directed east. What is the net force acting on the car?
A) 7 kN east
B) 24 kN up
C) 2 kN west
D) 5 kN east
E) 2 kN east

2) A man who weighs 600 N is sitting in a chair with his feet on the floor and arms resting on the armrests. The chair weighs 100 N. Each armrest exerts an upward force of 25.0 N on his arms and the seat exerts an upward force of 500 N. What force does the floor exert on his feet?
A) 75 N upward
B) 500 N upward
C) 525 N upward
D) 50 N upward
E) 0 N

Explanation / Answer

1) The gravitational force and normal force balance. Therefore the net force is 2 kN West c is an answer 2) Upward force – Downward forces = 500 + 25 + 25 – 600 = -50N. d is an answer

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