Unit 2: Forces and Newtons Laws

A 5 kg block is pushed along a frictionless surface with a net force of 15 N. What is the acceleration in m/s²?

A 10 kg block sits on a surface with coefficient of static friction μs = 0.4. What is the minimum horizontal force needed to start the block moving? (g = 10 m/s²)

A 10 kg box sits on a frictionless surface. A horizontal force of 50 N is applied. The acceleration is

A 5 kg block is pushed up a frictionless incline making a 30° angle with the horizontal. The magnitude of the force parallel to the incline needed to push the block at constant velocity is

Two blocks of masses 3 kg and 5 kg are connected by a massless string on a frictionless horizontal surface. A horizontal force of 40 N is applied to the 5 kg block. The tension in the string between the blocks is

A 2 kg book rests on a table. According to Newton's third law, the reaction force to the weight of the book is

A 4 kg block on a horizontal surface has a coefficient of kinetic friction of 0.3. If pulled by a rope at 37° above the horizontal with a force of 50 N, the acceleration of the block is approximately (sin 37° ≈ 0.6, cos 37° ≈ 0.8, g = 10 m/s²)

An elevator accelerates upward at 2 m/s². A person standing on a scale in the elevator has a true weight of 600 N. The reading on the scale is

A mass m hangs from two ropes making angles of 30° and 60° with the ceiling. The tension in the rope at 30° from the vertical is

A satellite orbits Earth in a circular orbit. The gravitational force on the satellite provides

A 5 kg block sits on a 10 kg block which rests on a frictionless surface. The coefficient of static friction between the blocks is 0.4. What is the maximum horizontal force that can be applied to the bottom block without the top block sliding? (g = 10 m/s²)

A 1000 kg car rounds a flat curve of radius 50 m at 20 m/s. The friction force providing centripetal acceleration is

A 3 kg block on a frictionless surface is connected by a string over a frictionless pulley to a hanging 2 kg block. The acceleration of the system is (g = 10 m/s²)

A 10 kg object hangs from two ropes making 30° and 60° with the horizontal. The tension in the rope at 30° is closest to (g = 10 m/s²)

A 10 kg object has a net force of 40 N acting on it. What is its acceleration?

A 5 kg box sits on a table. A person pushes down on the box with a force of 20 N. What is the normal force? (g = 10 m/s²)

A book sits on a table. Which is the Newton's third law pair to the gravitational force the Earth exerts on the book?

A block on a frictionless 30° incline has a mass of 4 kg. What is the acceleration down the incline? (g = 10 m/s²)

A 70 kg astronaut weighs less on the Moon than on Earth because:

Two forces of 3 N and 4 N act on an object at right angles. What is the magnitude of the resultant force?

A person weighing 600 N is in an elevator accelerating downward at 2 m/s². The scale reads: (g = 10 m/s²)

Static friction is generally _____ kinetic friction.

A ball on a string swings in a vertical circle. At the bottom of the circle, the tension in the string is:

A 3 kg block on a frictionless 30° incline is connected by a string over a pulley to a 5 kg hanging block. What is the system acceleration? (g = 10 m/s²)

A horse pulls a cart forward. The horse can accelerate because:

In an Atwood machine with masses 4 kg and 6 kg, what is the tension in the string? (g = 10 m/s²)

A 10 kg block is on a 37° incline. What is the normal force? (g = 10 m/s², cos 37° ≈ 0.8)

Three boxes (2 kg, 3 kg, 5 kg) are pushed across a frictionless surface by a 20 N force applied to the 2 kg box. What is the acceleration of the system?

What is the acceleration of the system?

What is the acceleration of the system?

What is the maximum static friction force before the block begins to slide?

What is the acceleration of the block down the incline?

According to Newton's third law, which statement is correct?

What is the tension in the string connecting the two blocks?

What does the scale read when the elevator accelerates upward?

What is the minimum speed at the top of the loop for the car to maintain contact with the track?

What is the magnitude of Force C needed for equilibrium?

What is the spring constant?

A 2.0 kg block sits on a 5.0 kg block, which sits on a frictionless table. A horizontal force of 21 N is applied to the bottom block. If the coefficient of static friction between the blocks is 0.40, does the top block slide? (g = 10 m/s²)

A 1500 kg car rounds an unbanked curve of radius 50 m at a constant speed of 15 m/s. What provides the centripetal force?

A 4 kg block is placed on a 30° incline with coefficient of kinetic friction [math]. The block slides down the incline. What is the acceleration? (g = 10 m/s²)

A 1200 kg car rounds an unbanked curve of radius 50 m at 15 m/s. What minimum coefficient of static friction is needed to prevent skidding?

An elevator accelerates upward at 2 m/s². A person standing on a scale inside the elevator has mass 60 kg. What does the scale read? (g = 10 m/s²)

Two blocks of masses 3 kg and 5 kg are connected by a string over a frictionless pulley (Atwood machine). What is the acceleration of the system? (g = 10 m/s²)