Question

question 5 (1 point) force was defined in section 3.10 as a push or a pull that acts on an object in order to make the object move or to make it move faster or slower. in other words, a force causes an object to accelerate (f = m*a).
question 6 (1 point) a block of wood has a mass of 1.25 kg. how much force does it exert on the ground? the normal force is mass (kg) multiplied by the acceleration due to gravity (g), where g = 9.8 m/s²
○ a 12.25 n
○ b 12n
○ c 1.25n
○ d 9.8m/s
question 7 (1 point) aside from the skid steering, friction in a robot is much more complicated and difficult to account for. at the wheels, static friction cannot be overcome, or else the robot will spin out. furthermore, static and kinetic friction are internal to the drive train and these are very difficult to quantify in terms of normal forces and coefficients of friction. often this type of friction can only be found indirectly.
○ true
○ false

Explanation:

Step1: Recall the formula for normal force

The normal force \(F_N\) on a horizontal surface is given by \(F_N = mg\), where \(m\) is the mass and \(g\) is the acceleration due to gravity.

Step2: Substitute the given values

Given \(m = 1.25\space kg\) and \(g=9.8\space m/s^{2}\). Then \(F_N=1.25\times9.8\).

Step3: Calculate the value

\(1.25\times9.8=(1 + 0.25)\times9.8=9.8+0.25\times9.8=9.8 + 2.45=12.25\space N\)

Answer:

a. 12.25N