Forces Review

Which forces act on a person hanging from a rope swing?

• Gravitational force only

• Gravitational force and tension

• Tension only

• No forces act

Tags

NGSS.MS-PS2-4

Draw a free body diagram for the following situation: Your classmate doesn’t want to leave the fundamentals of chemistry and physics class. You apply a force to drag him to the left towards the cafeteria. Be sure to include all forces that would act on the object. Assume there is no air resistance for any situation where the object is not "falling" unless the problem indicates otherwise.

• What forces act on your classmate when you drag him to the left?

• What is the direction of the force applied to your classmate?

• What is the effect of air resistance in this scenario?

• What happens to your classmate when you apply force?

Tags

NGSS.MS-PS2-2

Which forces act on an egg falling from a nest in a tree, assuming there is no air resistance?

• Only gravitational force

• Gravitational force and air resistance

• Gravitational force and friction

• No forces act on the egg

Tags

NGSS.MS-PS2-4

Which of the following forces act on a car moving along the highway to the West at a constant velocity, assuming no air resistance?

• Gravitational force and normal force

• Gravitational force, normal force, and frictional force

• Gravitational force, normal force, frictional force, and air resistance

• Only gravitational force

Which forces should be included in a free body diagram for a skydiver descending with a constant velocity, assuming there is air resistance?

• Only gravitational force

• Only air resistance

• Both gravitational force and air resistance

• Neither gravitational force nor air resistance

A force is applied to a book to move it across the desk to the right. Which of the following describes the forces acting on the book?

• Only the applied force to the right

• Applied force to the right and frictional force to the left

• Applied force to the right and gravitational force downward

• Applied force to the right, frictional force to the left, and gravitational force downward

Tags

NGSS.MS-PS2-2

A person throws a baseball straight up in the air causing it to accelerate upwards. Assume there is no air resistance. What happens to the baseball after it is thrown?

• It continues to accelerate upwards indefinitely.

• It reaches a maximum height and then falls back down.

• It stops immediately after being thrown.

• It moves upwards and stays at the maximum height.

Tags

NGSS.MS-PS2-4

NGSS.MS-PS3-5

An object is in freefall. What is the primary force acting on the object?

• Gravity

• Air resistance

• Friction

• Magnetism

Tags

NGSS.MS-PS2-4

Challenge: A hockey puck moves at a constant velocity on frictionless ice. Why does the puck continue to move at a constant velocity?

• Because there is no net force acting on it

• Because it is being pushed continuously

• Because of air resistance

• Because of friction

Tags

NGSS.MS-PS2-2

For each of the following problems: 1. List ALL of the forces that would act on the object. 2. Draw the free body diagram. 3. Calculate net force in both the X and Y direction (if necessary). 4. Are the forces balanced or unbalanced? 5. Does it accelerate? What direction if so? Your fundamentals of chemistry and physics teacher falls off of a tall building (don’t get too excited, I have a parachute on☺). The gravity is pulling her down with a force of 124 N, while her parachute pushes her upwards with a force of 82 N.

• The forces are balanced, and there is no acceleration.

• The forces are unbalanced, and there is acceleration upwards.

• The forces are unbalanced, and there is acceleration downwards.

• The forces are balanced, and there is acceleration downwards.

Tags

NGSS.HS-PS2-1