GA S8P3.b Forces and Motion

Grace is driving her car at a constant speed on a straight highway. According to Newton's First Law of Motion, what can be inferred about the forces acting on Grace's car?

• The forces are unbalanced, causing the car to accelerate.

• The forces are balanced, resulting in no change in the car's motion.

• There are no forces acting on the car.

• The car is experiencing a net force in the direction of motion.

A book is resting on a table. Describe the forces acting on the book and explain why it remains at rest.

• The gravitational force is greater than the normal force, causing the book to stay at rest.

• The normal force is greater than the gravitational force, keeping the book stationary.

• The gravitational force and the normal force are balanced, so the book remains at rest.

• There are no forces acting on the book.

A soccer player kicks a ball, and it moves in a curved path. Using Newton's Laws, explain why the ball follows this path.

• The ball moves in a straight line due to balanced forces.

• The ball's path is curved because of unbalanced forces acting on it, such as gravity and air resistance.

• The ball's path is curved because it is not affected by any forces.

• The ball moves in a curved path due to balanced forces.

Avery pushes a shopping cart across the supermarket floor with a constant force, and the cart moves at a constant speed. What can be concluded about the forces acting on the cart?

• The applied force is greater than the frictional force.

• The applied force is equal to the frictional force.

• The frictional force is greater than the applied force.

• There are no forces acting on the cart.

A rocket is launched into space. Explain how Newton's Third Law of Motion applies to the motion of the rocket.

• The rocket moves upward because the forces are balanced.

• The rocket moves upward because the force of gravity is greater than the thrust.

• The rocket moves upward because the thrust force is greater than the gravitational force.

• The rocket moves upward because the thrust force and the gravitational force are equal.

Kai is cycling uphill and suddenly stops pedaling. What will happen to the motion of the bicycle, and why?

• The bicycle will continue moving uphill at the same speed due to balanced forces.

• The bicycle will stop immediately because there are no forces acting on it.

• The bicycle will slow down and eventually stop due to unbalanced forces, such as gravity and friction.

• The bicycle will accelerate uphill due to unbalanced forces.

A ball is thrown straight up into the air. Describe the forces acting on the ball at the highest point of its trajectory.

• Only the gravitational force is acting on the ball.

• Both gravitational and upward forces are balanced.

• No forces are acting on the ball.

• The upward force is greater than the gravitational force.

A skateboarder is moving at a constant speed on a flat surface. What can be inferred about the net force acting on the skateboarder?

• The net force is zero because the forces are balanced.

• The net force is in the direction of motion.

• The net force is opposite to the direction of motion.

• There is no net force acting on the skateboarder.

A car accelerates from rest. Using Newton's Second Law, explain the relationship between the net force acting on the car and its acceleration.

• The net force is inversely proportional to the acceleration.

• The net force is directly proportional to the acceleration.

• The net force is equal to the acceleration.

• The net force is unrelated to the acceleration.

Elijah is pushing a 2 kg cart along a smooth, level surface, and the cart is moving with a constant velocity. What can be said about the net force acting on the cart?

• The net force is 2 N.

• The net force is 0 N.

• The net force is equal to the weight of the cart.

• The net force is equal to the mass of the cart.