Unit 4 Physics Review

Front

What is the relationship between tension force and friction force when an object is speeding up?

Back

The friction force must be less than the tension force in the direction of motion.

Front

How do you calculate the height of a horizontal projectile that takes 3 seconds to hit the ground?

Back

Use the formula: height = 0.5 * g * t^2, where g = 9.8 m/s². For t = 3s, height = 0.5 * 9.8 * 3^2 = 44.1 m.

Front

State the Pythagorean Theorem.

Back

a² + b² = c², where c is the hypotenuse of a right triangle.

Front

Does an object projected horizontally from a cliff take the same time to hit the ground as an object dropped vertically?

Back

Yes, both take the same amount of time to hit the ground.

Front

What does a cart rolling down an inclined plane with constant speed indicate about the forces acting on it?

Back

The net force acting on the cart is zero; the gravitational force is balanced by the frictional force.

Front

Define frictional force.

Back

Frictional force is the force that opposes the relative motion of two surfaces in contact.

Front

What is the formula for calculating the force of gravity acting on an object?

Back

F = m * g, where F is the force, m is the mass, and g is the acceleration due to gravity (approximately 9.8 m/s²).

Front

Explain the concept of projectile motion.

Back

Projectile motion is the motion of an object thrown into the air, subject to only the acceleration of gravity.

Front

What is the significance of the x and y components of a force?

Back

The x-component affects horizontal motion, while the y-component affects vertical motion.

Front

How does the angle of projection affect the range of a projectile?

Back

The optimal angle for maximum range is 45 degrees.