Unit 3 Sem A Review

According to Newton's first law of motion, an object at rest will remain at rest and an object in motion will continue moving at a constant velocity unless acted upon by an external force. This is also known as:

• law of acceleration

• law of inertia

• law of motion

• law of gravity

Which of the following statements best describes Newton's second law of motion?

• The force acting on an object is equal to the mass of the object multiplied by its acceleration.

• The force acting on an object is equal to the product of its mass and gravitational acceleration.

• The force acting on an object is equal to the distance traveled by the object divided by the time taken.

• The force acting on an object is equal to the velocity of the object multiplied by its mass.

Which of the following is an example of Newton's third law of motion?

• Pushing against a wall and feeling it push back

• Sitting in a chair and feeling the weight of your body

• Running and feeling the wind against your face

• Throwing a ball and watching it fall to the ground

When solving problems with forces in 2D, what is the process of breaking a force into its components called?

• decomposing forces

• analyzing forces

• splitting forces

• resolving forces

What is the formula for universal gravitation?

Which of the following is an example of a contact force?

• Gravity

• Magnetism

• Electricity

• Friction

Which law of motion states that for every action, there is an equal and opposite reaction?

• Third Law of Motion

• Law of Inertia

• Second Law of Motion

• First Law of Motion

A block is placed on a ramp inclined at an angle of 30°. What is the component of the weight of the block parallel to the ramp?

• Weight * cos(30°)

• Weight * tan(30°)

• Weight * sin(30°)

• Weight * sin(60°)

Which of the following is NOT a contact force?

• Force of friction

• Force of tension

• Force of air resistance

• Force of gravity

What is the acceleration of an object with a mass of 5 kg and a net force of 10 N?

• 2 m/s²

• 0.5 m/s²

• 20 m/s²

• 5 m/s²