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Physics Problems: Normal Forces and Frictional Forces, Exams of Physics
Several physics problems related to normal forces and frictional forces. The problems involve calculating the normal force of a ramp on a block, the normal force of a platform on a cow, and the frictional force of a platform on a cow. Additionally, there are questions about the forces that cause a skateboard to accelerate and the direction of frictional forces on tires. Diagrams are provided to help solve the problems.
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A 10kg block slides down a 30
^ incline, as shown. Write an expression for the normal
force of the ramp on the block.
m = 10 kg
An 800kg cow is lowered on a level platform, as shown. If the platform acceleratesupward at 10m/s, what is the normal force of the platform on the cow?
An 800kg cow is lowered on a level platform, as shown. If the platform acceleratesupward at 10m/s, what is the frictional force of the platform on the cow?
You ride your skateboard around the quad. Which force(s) directly cause(s) theskateboard to accelerate forward?a.
The ground on your foot. b.
Your foot on the ground. c.
The skateboard on your foot. d.
Your foot on the skateboard. e.
The wheels on the ground. f.^
The ground on the wheels.
A skateboarder rides around the quad. Is the frictional force on the wheels (by theground) forward or backward?
You decide to go for a bicycle ride. On your way up Centerville Road,a) which direction does the frictional force on your front tire point?b) which direction does the frictional force on your back tire point?
Use the approximation that
g=~10 m/s
2 to fill in the blanks in the following diagram.
m = 8 kg
^
= 0.
30°
Fperson on block
= 60 N
FEarth on block
= ___ N
N^ table on block
= ___ N
FEarth on block
= ___ N
m = 8 kg
^
= 0.
30°
Fperson on block
= 60 N
Use the approximation that
g=~10 m/s
2 to fill in the blanks in the following diagram.
N^ table on block
= ___ N
FEarth on block
= ___ N
m = 8 kg
ftable on block
= ___ N
^
= 0.
30°
Fperson on block
= 60 N
Use the approximation that
g=~10 m/s
2 to fill in the blanks in the following diagram.
Use the approximation that
g=~10 m/s
2 to fill in the blanks in the following diagram.
N^ table on block
= 50 N
FEarth on block
= 80 N
m = 8 kga = ___ m/s
2
ftable on block
= 25 N
^
= 0.
30°
Fperson on block
= 60 N
Use the approximation that
g=~10 m/s
2 to fill in the blanks in the following diagram.
Tstring
= ____ N
a = 25 m/s
2 right
^
= 0.
Fperson on 6block
= ____ N
3 kg
6 kg