⚡ Dynamics — Unit Quiz

A 10 kg object is in free fall (no air resistance). What is the net force on it? (g = 10 m/s²)

A free body diagram of a book resting on a table should show which forces?

According to Newton's First Law, an object at rest will remain at rest unless:

A 4 kg block is pushed across a frictionless surface with a net force of 20 N. What is the block's acceleration?

A skydiver reaches terminal velocity. Select ALL statements that are true at that moment.

A 5 kg object is pushed by a 25 N applied force on a surface with 10 N of kinetic friction. What is the acceleration?

A book sits on a table. Which of these is the Newton's Third Law pair to the weight of the book (Earth pulling the book down)?

Two boxes are connected by a rope on a frictionless surface. Box A (3 kg) is pulled forward with F = 24 N, dragging Box B (5 kg) behind it. What is the tension in the rope between them?

An object moves at constant velocity. Select ALL that must be true.

A 60 kg person stands in an elevator that accelerates upward at 2 m/s². What is the normal force from the floor on the person? (g = 10 m/s²)

A 20 kg box is on a surface with μ_s = 0.4 and μ_k = 0.3 (g = 10 m/s²). A 70 N force is applied horizontally. What is the box's acceleration?

A 2 kg block sits on top of a 5 kg block, which sits on a frictionless table. The coefficient of static friction between the blocks is 0.3. What is the maximum horizontal force that can be applied to the 5 kg block so that both blocks accelerate together? (g = 10 m/s²)

A block is on an incline angled at θ. It slides down at constant velocity. Select ALL correct statements.

A 10 kg box is on a ramp inclined at 30° with μ_k = 0.2. The box is given a push and slides down. (a) Draw a complete free body diagram with all forces labeled. (b) Calculate the acceleration of the box down the ramp. (g = 10 m/s², sin 30° = 0.5, cos 30° = 0.87)

A 3 kg block (Block A) sits on a frictionless table, connected by a string over a frictionless pulley to a hanging 2 kg block (Block B). (a) Draw free body diagrams for each block. (b) Find the acceleration of the system and the tension in the string. (g = 10 m/s²)