Forces and Motion

A person pushes against a wall with a force of $50\text{ N}$. What is the magnitude of the force the wall exerts back on the person?

Force is a vector quantity because it has both:

Which of the following increases the braking distance of a car?

Which law states that an object at rest will stay at rest unless acted upon by an external force?

An object starts from rest and accelerates at a constant rate until it reaches a velocity of $20\text{ m/s}$ after $5\text{ seconds}$. It then travels at this constant velocity for an additional $5\text{ seconds}$. What is the total distance covered by the object during the entire $10\text{-second}$ interval?

An object moves in a straight line through two distinct phases of motion as shown in the diagram. During the first phase, it moves at a constant velocity. During the second phase, it undergoes constant acceleration. What is the total displacement of the object after the full $10\text{ seconds}$?

A box of mass $m$ is being pulled across a floor at a constant speed by a force $F$. What is the magnitude of the friction force?

An object moves from position $x = 0$ at $t = 0$. Its velocity is given by $v = kt$, where $k$ is a constant. What is the displacement $s$ of the object at time $T$?

A bullet of mass $0.01\text{ kg}$ is fired into a wooden block at $200\text{ m/s}$. It penetrates $0.1\text{ m}$ before stopping. What was the average resistive force exerted by the block?

A ball is thrown upwards. Taking upwards as positive, which of the following represents the acceleration-time graph of the ball while it is in the air?

If an object is moving at a constant velocity, the net force must be:

Which law describes why a rocket can propel itself in space where there is no air to push against?

What is the acceleration of a $5$ kg object when a net force of $0$ N is applied?

When a hammer hits a nail, the nail exerts a force on the hammer that is:

An object experiences two forces: $10$ N North and $10$ N South. What is the resulting motion of the object if it was initially at rest?

A person is standing on a scale in an elevator that is accelerating upwards. The scale reading will be:

If an object is moving at a constant velocity, the sum of all forces acting on it is:

An object moves in a straight line with a velocity that changes from $5$ m/s to $25$ m/s in $10$ seconds. If the mass of the object is $2$ kg, what is the net force acting on it?

A force $F$ is applied to mass $m_1$, giving it acceleration $a$. The same force $F$ is applied to mass $m_2$, giving it acceleration $3a$. If the two masses are fastened together and the same force $F$ is applied, what will be the acceleration?

A $100$ kg bungee jumper is momentarily at rest at the lowest point of their jump. At this instant, the upward force from the bungee cord is $1500$ N. What is the jumper's acceleration at this point? (Take $g = 10$ m/s$^2$)

Which of these is most likely to reduce the friction of a sliding box?

If you push a book across a table and then let go, why does it eventually stop?

What is the direction of the air resistance force on a car moving forward?

Why are mountain bike tires much wider and knobbier than road bike tires?

Which of the following would have the LEAST air resistance?

When you rub your hands together quickly, they feel warm. Which energy transfer is occurring?

If an object is moving through a fluid, the force of drag depends on which of the following?

A block of mass $5\ kg$ is on a horizontal surface. A force of $20\ N$ is applied at an angle of $60^\circ$ to the horizontal. If the block moves at constant velocity, what is the coefficient of kinetic friction?

A $10\ kg$ object is falling through the air. If the acceleration is $2.0\ m/s^2$ downwards, what is the magnitude of the air resistance force? (Use $g = 9.8\ m/s^2$)

What happens to the temperature of a sliding block and the surface it is on due to friction?

A car moves at $20\text{ m/s}$ for $5\text{ seconds}$. What is the shape of the area to be calculated on a velocity-time graph to find the distance?

Which physical quantity is represented by the slope of a velocity-time graph?

If you calculate the slope of a distance-time graph, what units will your answer be in?

Which of the following is true for an object with a constant velocity of $10\text{ m/s}$?

An object moves according to the velocity and time data points shown in the flowchart below. Assuming the velocity changes linearly between the recorded times, what is the total displacement of the object after $15\text{ seconds}$?

What happens to the gradient of a velocity-time graph when a constant force is applied in the direction of motion?

If an object travels at $5\text{ m/s}$ for $4\text{ seconds}$ and then $10\text{ m/s}$ for $2\text{ seconds}$, what is its total displacement on a velocity-time graph?

A graph of 'Acceleration vs Displacement' is provided. What does the area under this graph represent when multiplied by the mass of the object?

An object's velocity is given by $v = 10 + 2t^2$. What is the area under the Velocity-Time graph from $t = 0$ to $t = 3$ (representing displacement)?

If the Distance-Time graph is a curve with an increasing gradient, the corresponding Velocity-Time graph must have:

Which of these represents a change in velocity?

What is the SI unit for temperature?

In a distance-time graph, a steeper slope indicates:

What is the term for a push or a pull?

Which is the correct conversion for $1$ hour into seconds?

What is the primary cause of air resistance acting on a moving car?

A car accelerates at $3$ m/s$^2$ for $4$ seconds starting from rest. How far does it travel?

A body is in equilibrium. This means:

Newton's Third Law states that action and reaction forces act on:

If a graph of $s$ (displacement) vs $t^2$ (time squared) is a straight line through the origin, the acceleration is:

Why is it important to use a graduated cylinder rather than a beaker for measuring volume?

If you have two objects with the same volume, the one with more mass will have:

What is the density of a substance if $50\,cm^3$ has a mass of $150\,g$?

A block of wood has a mass of $150\,g$ and a volume of $200\,cm^3$. Its density is:

If you double both the mass and the volume of an object, what happens to its density?

A hydrometer is an instrument used to measure the density of liquids. If it sinks deeper into Liquid A than Liquid B, what can you conclude?

Which of these factors does NOT affect the density of a solid object?

A solid metal cube has a side length $L$ and density $\rho$. If it is melted and recast into a sphere, what will be the density of the sphere (assuming no mass loss)?

In a laboratory experiment to find the density of a gas, the mass of an evacuated flask is $120.45\ g$. When filled with a gas at STP, the mass is $121.25\ g$. If the flask volume is $500\ cm^3$, what is the density of the gas?

A tank is filled with water to the brim. A $5\ kg$ block of wood (density $500\ kg/m^3$) is placed gently on the water. How much water overflows?

If an object is falling freely under gravity, its acceleration is:

What is the result of dividing total displacement by total time?

In the equation $v = u + at$, if $a = 0$, then:

A car moves $100 \text{ m}$ East and then $100 \text{ m}$ West. What is its displacement?

A cyclist starts from rest and accelerates at a constant rate of $2\text{ m/s}^2$ for $6\text{ s}$. The cyclist then continues at this resulting constant velocity for an additional $10\text{ s}$. What is the total displacement of the cyclist for the entire $16\text{ s}$ journey?

An object is projected up a smooth ramp with an initial velocity of $12\text{ m/s}$. It experiences a constant deceleration of $4\text{ m/s}^2$ due to the slope. What is the total distance it travels along the ramp before it momentarily comes to a stop?

A car accelerates from rest at $2.5\text{ m/s}^2$ for $10\text{ seconds}$. How far has it traveled?

A body is dropped from a height $h$. If $t_1$ is the time to cover the first half of the height and $t_2$ is the time for the second half, what is the relationship between $t_1$ and $t_2$?

A car decelerates at $5\text{ m/s}^2$ and stops in $30\text{ m}$. What was its initial velocity?

A ball is thrown up with velocity $u$. At what height is its kinetic energy equal to its potential energy? (Assume ground is zero PE)

Hooke's Law applies to which of the following?

If $F = 20 N$ and $x = 0.5 m$, what is $k$?

What is the extension of a spring if its length changes from $20 cm$ to $25 cm$?

Which of these is the dependent variable in an experiment where you measure the extension for different forces?

If a force-extension graph is a straight line through the origin, we say the relationship is:

A spring has $k = 60\ N/m$. How much force is needed to produce an extension of $15\ cm$?

When a spring is stretched, where is the energy stored?

A $2.0\text{ kg}$ mass is dropped from a height of $0.5\text{ m}$ onto a vertical spring with $k = 2000\text{ N/m}$. What is the maximum compression of the spring? ($g = 10\text{ m/s}^2$, ignore the change in GPE during compression for this estimate).

A spring has a limit of proportionality at $F = 60\text{ N}$ and $x = 12\text{ cm}$. If the spring is stretched to $15\text{ cm}$, the force required is $85\text{ N}$. Which statement is true?

The 'stiffness' of a system with three springs of constant $k$ in series is $K_s$. The stiffness of three springs in parallel is $K_p$. What is the ratio $K_p / K_s$?

If an object's velocity is halved, its momentum is:

Airbags save lives by decreasing the _____ of impact by increasing the _____ of impact.

A $2\,kg$ object at $5\,m/s$ hits a stationary $2\,kg$ object and they stick together. What is their combined mass?

Conservation of momentum is based on which of Newton's Laws?

Two objects of different mass have the same kinetic energy. Which one has more momentum?

A $2\ kg$ object has a momentum of $16\ kg\cdot m/s$. What is its kinetic energy?

Why is it safer to land on a gym mat than on a concrete floor after a jump?

A $70\text{ kg}$ person is running at $5\text{ m/s}$ and jumps onto a stationary $30\text{ kg}$ cart. What is the final velocity of the cart and person?

If the net external force on a system is zero, the total momentum of the system:

A $2\text{ kg}$ block slides down a frictionless ramp from a height of $5\text{ m}$ and collides inelastically with a stationary $3\text{ kg}$ block. What is their final speed?

What is the primary purpose of a lever?

If a force of $50\text{ N}$ is applied $0.1\text{ m}$ from a pivot, the moment is:

Why do sports cars have very low ground clearance?

In physics, 'Equilibrium' means the object is:

What happens to the center of mass of a person when they lift their arms up?

Calculate the force needed to produce a $40\ N\ m$ moment at a distance of $400\ mm$.

A see-saw is balanced. If a person on the right moves closer to the pivot, what happens to the see-saw?

A heavy uniform beam is supported by two people. If one person moves closer to the center of the beam, what happens to the force they must exert?

A wrench is used to apply a torque. Why is it easier to loosen a bolt if you grip the wrench further from the bolt?

A uniform square lamina of side $10\text{ cm}$ has a mass of $100\text{ g}$. A small $50\text{ g}$ mass is placed at one of its corners. How far from the center of the square is the new center of mass?

A manometer is used to measure:

Why do deep-sea divers need special suits?

If a pressure of $200\ Pa$ acts on an area of $0.1\ m^2$, what is the force?

Suction cups stick to a wall because:

A metal brick with a mass of $6\ kg$ has dimensions of $0.05\ m \times 0.10\ m \times 0.20\ m$. What is the difference between the maximum pressure and the minimum pressure that the brick can exert when placed on a flat horizontal table? (Take $g = 10\ m/s^2$)

A U-tube is used to compare the density of an unknown oil with water, which has a density of $1000\ kg/m^3$. As shown in the diagram, the height of the oil column above the interface level is $25\ cm$, while the height of the water column above the same interface level is $20\ cm$. What is the density of the unknown oil?

A cube of metal sits on a table. If the side length of the cube is doubled, how does the pressure it exerts on the table change? (Assume the density remains the same)

An object of volume $0.5\text{ m}^3$ is $50\%$ submerged in water. What is the buoyant force acting on it? (Density of water $= 1000\text{ kg/m}^3$, $g = 10\text{ m/s}^2$)

If the density of a liquid is tripled and the depth is halved, how does the hydrostatic pressure at that point change?

A hydraulic lift has a small piston of area $A$ and a large piston of area $10A$. If a $100\text{ N}$ force is applied to the small piston, it can lift a load of weight: