1. Which of the following, when present, is NOT and external force applied to a

Question

1. Which of the following, when present, is NOT and external force applied to a runner?
a. gravitational force
b. weight
c. Friction
d. Muscle force
e. All of above are external forces.

2. When drawing a free body diagram of a dancer pushing off in a jump, which of the following is NOT a force to be considered?
a. the dancer's weight
b. the push of the floor on the dancer's foot
c. the speed of the dancer across the floor
d. the friction of the floor on the dancer's shoe

3. If a normal force of 500N is acting on two surfaces in contact with a coefficient of friction equal to 0.5, what would be the maximum force of static friction?
a. 1000N
b. 500N
c. 250N
d. need more information to calculate

4. The coefficient of friction between the grass and a 2000N football blocking sled is 0.20. If a 1000N football player only pushes horizontally against the sled, what is the minimum force necessary to move the sled?
a. 100N
b. 200N
c. 300N
d. 400N
e. 600N

Explanation / Answer

1)a. gravitational force 2)c. the speed of the dancer across the floor 3)b. 500N $)d. 400N

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