Question 1:

The resultant of a 3000 N force to the right and a 2000 N force to the left is a 1000 N force to the right. This is beacuse force is a vector quantity - it has size and direction, so the resultant force is given by:

F_total = F₁ + F₂  = 3000 - 2000 = 1000 N to the right

This matches option C

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 2:

The correct answer is:

C. Velocity

Explanation:

• A. Magnetism → a non-contact force (attraction/repulsion from magnetic fields)

• B. Air resistance → a contact force (drag force from air opposing motion)

• D. Friction → a contact force (opposes motion between surfaces)

C. Velocity → not a force; it is a vector quantity describing speed in a given direction (rate of change of displacement).

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 3:

The correct answer is:

A. change the mass of the ball.

Explanation:
An unbalanced force can cause:

• B. change in speed → accelerate or decelerate the ball

• C. change in shape → squash ball deforms upon impact (elastic deformation)

• D. change in direction → alter the ball's path (e.g., hitting a wall)

A. change in mass → NOT possible by applying a force. Mass is a measure of the amount of matter in an object and remains constant unless matter is added or removed (e.g., eating, cutting). Forces do not change mass.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 4 to 8:

Here are the missing words in the passage:

As the ball accelerates, the downwards force of gravity on it stays the same (or remains constant), whilst the air resistance increases. Eventually the two forces are balanced (or equal). The resultant force on the ball is now zero. This means it stays at a constant speed, called the terminal velocity.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 9:

Based on the description of the squash ball falling (gravity constant, air resistance increasing until it balances weight, then terminal velocity):

Shape of the velocity–time graph:

1. Starts at zero (released from rest)

2. Curved section at the beginning –

   • Velocity increases rapidly at first (steep positive slope) because initially only gravity acts.

   • As speed increases, air resistance grows, so acceleration decreases.

   • The curve is concave down (slope becoming less steep over time).

3. Eventually becomes a horizontal straight line –

   • When air resistance equals weight, resultant force = zero, acceleration = zero.

   • Velocity becomes constant (terminal velocity).

   • Horizontal line continues from that point onward.

   This matches option D

Summary:
A curved line starting steep, becoming less steep, then flattening into a horizontal line → the classic "terminal velocity" curve on a velocity–time graph.

(It starts at the origin if dropped from rest, rises with decreasing slope, and levels off at terminal velocity.)

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 10:

If accelerating to the right, the forward (to the right) force must be larger than the backwards drag/friction force. This eliminates A and C as both arrows look equal.

The 2 upwards forces from the wheel bases must match the downwards force of gravity, when added together. This matches option D.

Final answer: Car D

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.