1. Forces Test 1 Review
Academic Physics

2. Problem 1
A pencil (m = 0.01kg) is dropped from some height. Focus on the point the pencil is released.
Calculate the weight of the pencil
Draw an FBD for the pencil
Is the situation representative of equilibrium or nonequilibrium?
What will happen to the motion of the pencil as it falls?
Consider Velocity
Consider Forces
Consider Acceleration

3. Problem 2
A piece of paper (m = 0.001kg) is falling at its terminal velocity towards the ground.
Calculate the weight of the paper
Draw an FBD for the paper
Is the situation representative of equilibrium or nonequilibrium?
What is the net force and acceleration on the paper?
What is the force of air resistance on the paper?

4. Problem 3
A hockey puck (m = 0.300kg) is being struck on an icy and flat surface with a force of 20N from the hockey stick.
Calculate the weight of the puck
Draw an FBD for the puck
Is the situation representative of equilibrium or nonequilibrium?
What is the net force on the puck?
What is the acceleration of the puck?

5. Problem 4
A crate (m = 15kg) is being pushed across a floor (m = 0.03) with a force of 20N applied.
Calculate the weight of the crate
Draw an FBD for the crate
Calculate the force of friction on the sliding crate
Is the situation representative of equilibrium or nonequilibrium?
What is the net force on the crate?
What is the acceleration of the crate?

6. Problem 5
A brick (m = 2kg) is sliding across a concrete floor (m = 0.6), having been released and allowed to slide freely.
Calculate the weight of the brick
Draw an FBD for the brick
Calculate the force of friction on the sliding brick
Is the situation representative of equilibrium or nonequilibrium?
What is the net force on the brick?
What is the acceleration of the brick?

7. Now for some Solutions!

8. Problem 1
A pencil (m = 0.01kg) is dropped from some height. Focus on the point the pencil is released.
Calculate the weight of the pencil
Draw an FBD for the pencil: below
Is the situation representative of equilibrium or nonequilibrium?
What will happen to the motion of the pencil as it falls?
Consider Velocity
Consider Forces
Consider Acceleration

9. Problem 2
A piece of paper (m = 0.001kg) is falling at its terminal velocity towards the ground.
Calculate the weight of the paper
Draw an FBD for the paper: below
Is the situation representative of equilibrium or nonequilibrium?
What is the net force and acceleration on the paper?
What is the force of air resistance on the paper?

10. Problem 3
A hockey puck (m = 0.300kg) is being struck on an icy and flat surface with a force of 20N from the hockey stick.
Calculate the weight of the puck
Draw an FBD for the puck: below (side view)
Is the situation representative of equilibrium or nonequilibrium?
What is the net force on the puck?
What is the acceleration of the puck?

11. Problem 4
A crate (m = 15kg) is being pushed across a floor (m = 0.03) with a force of 20N applied.
Calculate the weight of the crate
Draw an FBD for the crate: below
Calculate the force of friction on the sliding crate
Is the situation representative of equilibrium or nonequilibrium?
What is the net force on the crate?
What is the acceleration of the crate?

12. Problem 5
A brick (m = 2kg) is sliding across a concrete floor (m = 0.6), having been released to the right and allowed to slide freely.
Calculate the weight of the brick
Draw an FBD for the brick: below
Calculate the force of friction on the sliding brick
Is the situation representative of equilibrium or nonequilibrium?
What is the net force on the brick?
What is the acceleration of the brick?