Physical Sciences Grade 11 Test Week Ending 14Feb

Which of the following pairs of physical quantities are BOTH vectors?

• Displacement and speed

• Acceleration and force

• Force and mass

• Distance and electric field

Consider the motion of a driver of a car when he stops the car suddenly. The driver is wearing a seat belt. When the brakes are applied, the driver moves forward, but is restricted by the seat belt. How does the force that the driver exerts on the seatbelt compare to the force that the seatbelt exerts on the driver?

• Greater than and in the same direction.

• Greater than and in the opposite direction.

• Equal to and in the same direction.

• Equal to and in the opposite direction.

The diagram below shows a car covering equal displacements in equal time intervals. Which ONE of the following statements is true for the motion of the car?

• The car speeds up uniformly.

• The car slows down uniformly.

• The car is travelling at constant velocity.

• A net force acts on the car in the forward direction.

A body of mass m is in a state of weightlessness. Which ONE of the following statements concerning the weight and inertia of the body is TRUE?

• The body has weight and experiences inertia.

• The body has no weight and does not experience inertia.

• The body has weight and does not experience inertia.

• The body has no weight and experiences inertia.

Four forces A, B, C, and D of magnitudes 45 N, 50 N, 22 N, and 30 N respectively, act on a point O in the directions shown below. The forces are NOT drawn to scale. Define the term resultant vector.

• The vector sum of all individual vectors acting on a point.

• The difference between the largest and smallest vector.

• The average of all vectors acting on a point.

• The product of all vectors acting on a point.

Newton's Second Law of motion states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. Which of the following best describes this law?

• The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.

• The acceleration of an object is directly proportional to its mass and inversely proportional to the net force acting on it.

• The acceleration of an object is directly proportional to the net force acting on it and directly proportional to its mass.

• The acceleration of an object is inversely proportional to the net force acting on it and inversely proportional to its mass.

2.1 It is a single vector that can represent a number of vectors acting on an object in both magnitude and direction. What is the correct answer?

• Resultant vector

• Scalar quantity

• Unit vector

• Displacement

4.1 If a non-zero resultant force acts on an object at rest, the object accelerates in the direction of the resultant force. This acceleration is directly proportional to the force and inversely proportional to the mass of the object. What does this relationship explain?

• Newton's First Law of Motion

• Newton's Second Law of Motion

• Newton's Third Law of Motion

• Law of Conservation of Energy

Consider the questions and answer them and attach the solutions

Consider the diagram on the picture below and attempt the questions, attach the solutions below