Cracking the SAT Physics Subject Test

(E) 9 m/s^2 The coefficient of static friction between a box and a ramp is 0.5. The ramp’s incline angle is 30°. If the box is ...

Assuming a frictionless, massless pulley, determine the acceleration of the blocks once they are released from rest. (A) ...

(B) (C) (D) (E) If all of the forces acting on an object are balanced (net force is zero), then (A) the object must be at rest ...

static friction between the crate and the floor is 0.4, and the coefficient of kinetic friction is 0.3. A force F of magnitude 3 ...

(B) its mass is m and its weight is (C) its mass is and its weight is (D) its mass is m and its weight is (E) its mass is m and ...

Key Terms dynamics force tension gravitational force air resistance normal force frictional force electrostatic force Newton’s l ...

Summary Newton’s first law: An object at rest stays at rest, and an object in motion stays in motion. No force means no change i ...

distance between them. A uniform sphere attracts another body as if all of the sphere’s mass were concentrated at its center. ...

Chapter 4 Work, Energy, and Power It’s difficult to give a precise definition of energy. Loosely speaking, energy is a quantity ...

constant—that is, it will be conserved. For example, electrical energy can be converted into light and heat (this is how a light ...

WORK When you lift a book from the floor, you exert a force on it over a distance, and when you push a crate across a floor, you ...

When the formula for work works W = Fd cosθ only works when the Force does not change as the object moves. A 15 kg crate is mov ...

(a) How much work is done by the normal force? (b) How much work is done by the friction force? Here’s How to Crack It (a) Clear ...

Where F|| is the component in the direction of motion (or opposite if it is negative) and F⊥ is the component perpendicular to t ...

How much work is done by gravity? How much work is done by the normal force? How much work is done by friction? What is the tot ...

Notice that the work done by gravity is positive, as we would expect it to be, since gravity is helping the motion. Also, be car ...

WORK DONE BY A VARIABLE FORCE If a force remains constant over the distance through which it acts, then the work done by the for ...

The force exerted by a spring when it’s displaced by x from its natural length is given by the equation F(x) = −kx, where k is ...

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KINETIC ENERGY Consider an object at rest (v 0 = 0), and imagine that a steady force is exerted on it, causing it to accelerate. ...