This physics problem tests your understanding of fundamental physical laws and their applications. The step-by-step solution below breaks down the problem using relevant equations and physical reasoning.
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Question 25: In the gravitational force investigation, the formula F = mg is used. What does 'g' represent? A) Gravitational field strength (9.8 m/s^2) In the formula F = mg, F represents the gravitational force (weight), m is the mass of the object, and g is the acceleration due to gravity or gravitational field strength. Its approximate value on Earth is 9.8 m/s^2. The correct answer is A). Question 26: Velocity differs from speed because velocity: B) Includes both magnitude and direction Speed is a scalar quantity, meaning it only has magnitude. Velocity is a vector quantity, meaning it has both magnitude (speed) and direction. The correct answer is B). Question 27: A car travels 300 km in 5 hours. What is its average speed? Step 1: Use the formula for average speed. Average speed = Total distanceTotal time Step 2: Substitute the given values. Average speed = 300 km5 hours = 60 km/h The average speed is 60 km/h. The correct answer is B). Question 28: Acceleration is defined as: B) The change in velocity per unit time Acceleration is the rate at which an object's velocity changes over time. The correct answer is B). Question 29: If a car accelerates from 0 m/s to 20 m/s in 5 seconds, what is its acceleration? Step 1: Identify the given values. Initial velocity (u) = 0 m/s Final velocity (v) = 20 m/s Time (t) = 5 s Step 2: Use the formula for acceleration. a = (v - u)/(t) Step 3: Substitute the values and calculate. a = 20 m/s - 0 m/s5 s = 20 m/s5 s = 4 m/s^2 The acceleration of the car is 4 m/s^2. The correct answer is B). Question 30: Cohesive force refers to: B) The attraction between molecules of same substance Cohesive forces are the attractive forces between molecules of the same type. Adhesion refers to the attraction between molecules of different types. The correct answer is B). Question 31: In the capillary action experiment with water in a glass tube, water rises because: B) Adhesion and cohesion work together to pull water up Capillary action occurs due to the combined effects of adhesive forces (attraction between water molecules and the glass tube) and cohesive forces (attraction between water molecules themselves). Adhesion pulls the water up the sides of the tube, and cohesion pulls the rest of the water column along. The correct answer is B). Question 32: Which real-life application of force involves friction allowing us to perform an action? B) Gripping an object Friction is essential for gripping an object, as it provides the necessary resistance to prevent the object from slipping out of your hand. The correct answer is B). Question 33: Fossil fuels are best described as: B) Non-renewable resources derived from ancient plants and animals Fossil fuels (like coal, oil, and natural gas) are formed over millions of years from the remains of dead organisms and are considered non-renewable because they are consumed much faster than they are formed. The correct answer is B). Question 34: Which of the following is NOT an example of a fossil fuel? D) Solar energy Coal, natural gas, and crude oil are all types of fossil fuels. Solar energy is a renewable energy source derived from the sun. The correct answer is D). 3 done, 2 left today. You're making progress.