0625s23#1 first 20 from 0625/22 Feb/Mar 2023

Question 1 Which list contains two scalar quantities and two vector quantities?

• A distance, speed, time, velocity
• B force, velocity, distance, mass
• C mass, energy, temperature, momentum
• D weight, acceleration, momentum, speed

Question 2

• A at rest, moving with constant speed
• B moving with constant speed, at rest
• C moving with changing speed, at rest
• D moving with changing speed, moving with constant speed

Question 3

• A 5, 5, 5, 5
• B 5, 6, 7, 8
• C 5, 7, 10, 14
• D 5, 8, 14, 26

Question 4 The drag force on a car increases with speed. At 20 m / s, the total drag force is 400N. The mass of the car is 1200 kg and the driving force is constant at 700N. Which statement about the acceleration of the car at 20 m / s is correct?

• A The acceleration is 0.25 m/s² but will decrease as time passes.
• B The acceleration is 0.25 m/s² but will increase as time passes.
• C The acceleration is 0.0.58 m/s² but will decrease as time passes.
• D The acceleration is 0.0.58 m/s² but will increase as time passes.

Question 5 A rectangular swimming pool is 50m long and 25 m wide. It contains water at a depth of 2 m. The density of the water is 1000 kg /m³ . What is the mass of the water in the pool?

• A 2.5 kg
• B 2500 kg
• C 77 000 kg
• D 2 500 000 kg

Question 6 An object is rising vertically at constant speed through water. There are three vertical forces acting on it: the weight W, the drag force D, and the upward force U. Which diagram shows the magnitude and direction of the vertical forces acting on the object?

• A
• B
• C
• D

Question 7 Two boys of equal weight sit on one side of a see-saw, as shown. Their father, of weight 1000N, sits on the other side. The see-saw is balanced and is being used so that it moves up and down. During one part of the cycle, the father descends through a distance of 40 cm. At the same time, the boy nearest the pivot rises through 20 cm, while the other boy rises through 80 cm. What is the weight of each boy?

• A 200 N
• B 400 N
• C 600 N
• D 800 N

Question 8 A student measures the length of a spring. She then attaches different weights to the spring. She measures the length of the spring for each weight. The table shows her results. What is the extension of the spring with a weight of 3.0 N attached to it?

• A
• B
• C
• D

Question 9 The momentum of a body is changed by a force acting on it for a period of time. Which action increases the change in momentum?

• A doubling the force and halving the time
• B doubling the force for the same time
• C halving both the force and the time
• D halving the force and doubling the time

Question 10

• A mass, gravitational field strength
• B gravitational field strength, density
• C density, speed
• D speed, mass