Lesson 1: Introduction to Forces Answers

A ball is dropped from the top of a building. It initially moves at 4.0 m/s. After 0.5 seconds, it moves at 3.8 m/s.

A ball is falling at terminal velocity. Terminal velocity occurs when the ball is in equilibrium and the forces are balanced.Which free body diagram shows the ball falling at terminal velocity?

A box is being pulled to the right. The free body diagram is shown.

A box at rest is in a state of equilibrium half way up on a ramp. The ramp has an incline of 42° . What is the force of static friction acting on the box if box has a gravitational force of 112.1 N ?

A book is sitting on a desk. What best describes the normal force acting on the book?

What is the purpose of a free body diagram?

A box is at rest on a ramp at an incline of 22°. The normal force on the box is 538 N.

A box is pulled to the right with a force of 65 N at an angle of 58 degrees to the horizontal. The surface is frictionless. The free body diagram is shown.

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A ball is dropped from rest from the top of a building. What force is responsible for the downward motion of the ball?

A box is pushed down at an angle of 32 degrees on a rough surface. The box moves to the right.

Two teams are playing tug of war. Team A pulls to the right with a force of 450 N. Team B pulls to the left with a force of 415 N.

Which describes a positive or negative net force acting on an object? Check all that apply.It can cause an object to accelerate.It can cause an object to stop moving.It can cause an object to start moving.It can cause an object to change directions.It can cause an object at rest to remain at rest.