Forces and Motion

An apple falls from a tree. Which force is pulling the apple down?

Which force is exerted by the tires of a car on the road to allow the car to move forward?

What is the direction of the electrostatic force between two objects with the same (like) charge?

Which of these is NOT a non-contact force?

A Maglev train travels by hovering slightly above its tracks, ensuring there is no physical touch between the train and the rail. While it moves, three primary forces act on it:

• Force $A$: Magnetic repulsion from the track
• Force $B$: Gravitational pull from the Earth
• Force $C$: Air resistance (drag) from the surrounding air

Which of these are classified as non-contact forces?

When a person jumps off a diving board, they accelerate towards the water. Which statement is true during the fall?

Which of the following is an example of a contact force being used to change the direction of an object?

A metal ball is placed on an insulating stand. A strongly charged rod is brought close but does not touch it. What happens to the charges in the ball?

Why does a rough surface generally have more friction than a smooth surface?

An object is in 'Free Fall' when:

If you lift a $2 \text{ kg}$ box at a constant speed, about how much force in Newtons are you applying upwards?

Which of these is a unit of mass, often incorrectly used by people when they mean weight?

Why is the Newton meter often made with a transparent casing?

If an object is stationary (not moving) on a table, the upward support force from the table is:

If an object has a mass of $400\ g$ on Earth, what is its mass on the Moon?

Which force is used when you stretch a bow to fire an arrow?

A spring extends $0.5\ cm$ for every $1\ N$ of force. What is the extension if a $10\ N$ force is applied?

A steel bolt is attracted to a magnet with a force of $0.5\ N$. If the bolt has a mass of $20\ g$, what is the total downward force acting on the bolt when the magnet is held directly above it? (Use $g = 10\ N/kg$)

Which of the following describes a situation where the resultant force is NOT zero?

A spring has a natural length of $20\ cm$. When a force of $10\ N$ is applied, its length becomes $25\ cm$. If the force is increased to $30\ N$, and the spring remains within its elastic limit, what is the new length?

If an object has a net force of $0\ N$ acting on it, it must be:

When you squeeze a piece of clay, the forces you apply are:

What is the net force of a $12\ N$ force pushing North and a $4\ N$ force pushing South?

A girl is pushing a box with $40\ N$ of force, but the box doesn't move. How much friction is acting on the box?

Newton’s First Law of Motion is also known as the Law of:

A box is being pushed across a floor. The applied force is $50\text{ N}$ and the friction force is $20\text{ N}$. What is the net force?

If an object is moving at $10\text{ m/s}$ and an unbalanced force is applied in the opposite direction of its motion, the object will:

A ship is floating in the ocean. If more cargo is added to the ship and it sinks slightly lower into the water but remains floating, what is true about the new buoyant (upthrust) force?

If you are pushing a box with $10 \text{ N}$ and your friend is pulling it in the same direction with $5 \text{ N}$, and the friction is $12 \text{ N}$, what is the net force?

A rocket is traveling at a constant velocity in space. If the rocket fires its side thrusters briefly, how does the path of the rocket change?

A bus travels $100$ km in $5$ hours. What is its speed?

If speed is distance divided by time, what is $25$ meters divided by $5$ seconds?

Which of the following would usually be measured in km/h?

A swimmer covers $50$ meters in $25$ seconds. What is the swimmer's speed?

A remote control car travels $48\ meters$ in $12\ seconds$. What is its speed?

If distance is on the y-axis and time is on the x-axis, the gradient (slope) of the line represents:

A car travels $30\ km$ at $60\ km/h$ and then $30\ km$ at $30\ km/h$. What is the total time for the journey?

A drone covers a square field with a side length of $100\ meters$. If it flies along the perimeter at a speed of $4\ m/s$, how long does it take to return to the starting point?

A sound wave takes $0.5\ seconds$ to travel through a certain material that is $750\ meters$ long. What is the speed of sound in this material?

A car travels $60\ km$ at $40\ km/h$ and then $60\ km$ at $60\ km/h$. What is the average speed for the $120\ km$ journey?

What is the name for the 'gripping' force that allows a climber to hold onto a rock wall?

A book sits perfectly still on a flat table. Is there any sliding friction acting on it?

Why do competitive swimmers wear tight, smooth caps over their hair?

How does smoothing out a rough wooden board with sandpaper affect the friction it produces?

A heavy truck is parked on a steep hill. Force A represents the pull of gravity acting down the slope, and Force B represents the friction between the tires and the road surface. If the truck remains perfectly still and does not slide, which of the following must be true about the strengths of these two forces?

A hovercraft travels on a cushion of air. This design is mainly intended to:

A box is being pushed across a floor. If you place the box on a trolley with wheels, it becomes much easier to move. This is because:

A ship is moving through the ocean. To increase its fuel efficiency, engineers design the hull to be as smooth as possible. Which type of friction are they primarily trying to minimize?

In which direction does the air resistance force act on an object moving horizontally to the left?

What happens to the acceleration of a falling object as it approaches terminal velocity?

What is the weight of a $0.5\ kg$ loaf of bread on Earth?

Which celestial body has the strongest gravitational pull at its surface?

To convert mass in $kg$ to weight in $N$ on Earth, you should approximately:

A spring scale measures an object's weight by looking at how much the internal spring is:

What is the weight of a $0.02\ kg$ feather on Earth ($g = 9.8\ N/kg$)?

On Earth, a person's weight is $600\ N$. If they travel to a planet with a $g$ value of $5\ N/kg$, what will their mass be? (Use $g = 10\ N/kg$ for Earth)

Calculate the gravitational field strength ($g$) on a moon where a $10\ kg$ rock weighs $12\ N$.

A $1200\ kg$ car is transported to the Moon. How much force would be required to accelerate it at $2\ m/s^2$ horizontally across the lunar surface (ignoring friction)?

Which of the following statements about the Earth's gravitational field is true?

A $200\ g$ mass is used to calibrate a spring. On Planet X, the spring stretches $10\ cm$ when the mass is hung. If $g$ on Planet X is $5\ N/kg$, what is the spring constant $k$ in $N/m$? ($Force = k \times extension$)