Learning Suite
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lain Hunter
Exams
Practice Chapter 1: Forces: Scoring
Student:
1.
IStudent #1 - Attempt #1 - Score: 10.00/10 I~ I
A sprinter is coming out of the starting block, and only one
foot is touching the block. The sprinter pushes back
(horizontally) against the block with a force of 400 Nand
down (vertically) against the ground with a force of 800 N.
What is the magnitude of the resultant force?
1.
11
rrJ
/1 Points
comments
Less than 800 N
Between 800 Nand 900 N
Between 900 Nand 1000 N
More than 1000 N
2.
A sprinter is coming out of the starting block, and only one
foot is touching the block. The sprinter pushes back
(horizontally) against the block with a force of 400 Nand
down (vertically) against the ground with a force of 800 N.
What is the direction of the resultant force relative to the
ground?
2.
11
rrJ
/1 Points
comments
Less than 50 deg
Between 50 and 55 deg
Between 55 and 60 deg
Greater than 60 deg
3.
A 60-kg ice skater is gliding across the ice. The coefficient of
dynamic friction is 0.07. Ignoring the effect of air resistance,
what will the frictional force on the skater be?
3.
rrJ
/1 Points
comments
Less than 50N
Between 50N and 60N
Between 60N and 70N
More than 70 N
4.
The ground reaction force acting on a long jumper is 4300N
acting forward and upward at an angle of 72 deg from
horizontal. What is the vertical component of this ground
reaction force?
Less than 1000N
4.
rrJ
/l Points
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Between 1000N and 2000N
Between 2000N and 3000N
Between 3000N and 4000N
More than 4000N
5.
A 65-kg runner exerts 200N of horizontal force as he pushes
off the ground. The vertical ground reaction force at this
time is 950N. There are 75N of air resistance working
against his motion. What is the direction of the resultant
external force relative to the ground7
5.
11
~ /1 Points
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Between 0 and 20 deg
Between 20 and 40 deg
Between 40 and 60 deg
Between 60 and 80 deg
6.
A 75-kg skier glides down a 20 deg slope. There is a
frlC1lonal force of 105 N and air resistance of 75 N. What is
the resultant force working on the skler7
6.
11
~ /1 Points
comments
Between 50 and 60 N in the direction of motion
Between 60 and 70 N in the direction of motion
Between 70 and 80 N in the direction of motion
Between 80 and 90 N in the direction of motion
7.
The coefficient of static friction between Tammy's hand and
her tennis racquet is 0.48. How hard must she squeeze the
racquet If she want to exert a force of 180 N along the
longitudinal axis of the racquet7
7.
11
~ /1 Points
comments
Les s than 400N
Between 400N and 4s0N
Between 4s0N and SOON
More then 500 N
8.
The mass of an astronaut is 84 Kg on the surface of the
earth. What will be his mass in outer space (use 51 units for
mass even though units are not given In the answers)?
8.
11
~ /1 Points
comments
Zero
Between 1 and 200
Between 201 and 400
Between 401 and 600
More than 600
9.
The ground reaction force acting on a long jumper is 4300N
acting forward and upward at an angle of 72deg from
horizontal. What is the horizontal component of this ground
9.
11
~ /1 Points
comments
reaction force?
Less than lOOON
Between 1000N and 2000N
Between 2000N and 3000N
Between 3000N and 4000N
More than 4000N
10.
A cheerleader does a handstand on another cheerleaders
hands. If the lower cheerleader weights 160lb and the
vertical ground reaction force is 1211N. what must the top
cheerleader's mass be to have equilibrium?
Between 50 and 60kg
Between 60 and 70kg
Between 70 and 80kg
Between 80 and 90kg
10.
~ /1 Points
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