Friction
Describe an action that is made easier due to the addition of friction.
Swimming, Driving etc...
If you weigh 50 kilograms and the acceleration due to gravity on Jupiter is 24.5 m/s2 what is your weight on Jupiter?
2450 N
An object is pulled against a 20 N force of friction with a rope using a 36 N tension. What is the magnitude of the net force on the object?
What is 16 N
Which of Newton's Laws states: That for every action there is an equal and oppostite reaction?
What is Newtons 3rd Law
True or False: An unbalanced force doesn't affect motion.
What is False
What are the units used for coefficient of friction?
There are none
Less
A 70 kg person stands in an elevator. The elevator exerts a 1000 N force on the person. What is the acceleration of the elevator?
What is 4.48 m/s2
An object in motion stays in motion and an object at rest stays at rest unless acted upon by an outside force.
Newtons 1st Law
What is the definition for inertia?
What is The tendency of matter to resist a change in it's state of motion.
On a level ice surface a rubber sled is pulled at constant velocity with an applied force of 20 N. What is the weight of the sled in newtons?
133.3 Newtons
If an equal force acts on a pencil and a text books, which one will have GREATER acceleration?
The pencil
A 10 N block is pulled using a rope angled at 20 degrees from the horizontal using a tension of 10 N. There is no friction present. Draw a force diagram for this situation and calculate the normal force.
What is 6.58 N
True or False: On an incline your force of gravity will change.
False
A balanced force can either be stationary or...
Moving at constant velocity.
True or False. Using snow tires on an icy road is an example of increasing friction.
What is True
Fill in the blank. On an incline the magnitude of the normal force will be _______ the force of gravity of an object.
Less than
A 50 N big wheel tricycle is rolling down a 30 degree hill at constant velocity. Calculate the magnitude of the force of friction of the tricycle.
Wearing seat belts to protect passengers when a car stops quickly is an example of which law?
Newtons 1st Law
On the moon your mass would be
a. Larger
b. Less
c. The same
The same
A 20 kg object is pulled up a slope 20 degrees to the horizontal at constant velocity. Determine the coefficient of kinetic friction.
0.364
A horse pulls a cart with a slight acceleration. Create a to scale force diagram. Be sure to label all vectors. Vector length matters.
...
A 5 kg object is pushed against a wall with a force of 20 N. What is the magnitude of the normal force and the force of friction?
Normal force = 20 N
Force of Friction = 50 N
If I am sitting in my chair, gravity pushes down on me. What is the opposite and equal force in this scenario?
Describe what is acting on what like we did at the beginning of the unit.
The chair pushing up on me.
True or False: Acceleration is the rate at which inertia changes over time.
False