A man pushes a box with a force of 100 N to the right, and friction exerts a force of 100 N to the left. What will happen to the box?

The box will remain stationary.

The box will accelerate to the left.

The box will accelerate to the right.

The box will move at a constant velocity.

A car is accelerating on a straight road. Analyze the forces acting on the car. Which of the following is true?

The forward force exerted by the engine is greater than the resistive forces.

The resistive forces are greater than the forward force.

There are no forces acting on the car since it is already in motion.

The resistive forces (e.g., air resistance and friction) equal the forward force.

A box is being pulled to the right with a force of 50 N while experiencing a frictional force of 20 N to the left. Which of the following free-body diagrams correctly represents the situation?

A box with one arrow pointing to the right (50 N) and another arrow pointing to the left (20 N).

A box with one arrow pointing to the left (50 N) and another arrow pointing to the right (20 N).

A box with two arrows pointing in the same direction to the right.

A box with only one arrow pointing to the right (30 N).

An object is suspended in the air at rest. Which free-body diagram represents the forces acting on it?

An upward arrow (tension) equal in length to a downward arrow (gravity).

An upward arrow (tension) is longer than a downward arrow (gravity).

Two downward arrows of different lengths.

Only a downward arrow (gravity).

A car is accelerating forward. Which of the following free-body diagrams best represents the forces acting on the car, considering friction, gravity, and the engine force?

A forward arrow (engine force) longer than a backward arrow (friction), with equal upward (normal force) and downward (gravity) arrows.

A backward arrow (friction) longer than a forward arrow (engine force), with equal upward (normal force) and downward (gravity) arrows.

All arrows (forward, backward, upward, and downward) are equal in length.

No arrows, since forces cancel out.

A book is sliding down an inclined plane at a constant velocity. Analyze the forces acting on the book. Which free-body diagram correctly represents the forces?

A downward arrow (gravity), an upward arrow (normal force), and a backward arrow (friction) all balanced.

A downward arrow (gravity) longer than an upward arrow (normal force) and a backward arrow (friction).

Only a downward arrow (gravity) and an upward arrow (normal force).

A forward arrow (applied force) and a backward arrow (friction).

Create a free-body diagram for a block being pushed up an inclined plane at an accelerating rate. Which of the following elements must be included in the diagram?

A downward arrow (gravity), an upward arrow (normal force), a forward arrow (applied force), and a backward arrow (friction).

Only a forward arrow (applied force) and a backward arrow (friction).

A forward arrow (gravity) and a backward arrow (normal force).

A downward arrow (friction) and an upward arrow (gravity).

Which of the following situations demonstrates unbalanced forces?

A box sliding at constant speed.

Why do unbalanced forces cause a change in an object's motion?

Because the forces acting on the object do not cancel out, resulting in acceleration.

Because they increase the object's weight.

Because the net force acting on the object is zero.

Because the forces acting on the object are equal in magnitude and opposite in direction.

A ball is kicked and starts moving forward but slows down after a few seconds. Which unbalanced force is primarily causing the ball to slow down?

Friction between the ball and the ground.

Gravity pulling the ball upward.

A toy car is pushed and starts moving. After the push, the car gradually slows down and stops. Analyze the forces acting on the car after it has been pushed. Which statement is true?

The force of friction opposes the motion, causing the car to slow down.

The force of the push continues to act on the car, but it decreases over time.

The forces acting on the car are balanced after the push, so it stops.

Gravity is the only force acting on the car after the push.

A cyclist is pedaling on a flat road and suddenly stops pedaling. Analyze the motion of the bicycle. Which statement correctly explains why the bike slows down?

The unbalanced force of air resistance and friction acts on the bike, reducing its speed.

The force of gravity is greater than the forward force, causing the bike to slow down.

The bike slows down because there are no forces acting on it.

Balanced forces act on the bike, so it gradually slows down.

What is the key difference between distance and displacement?

Distance is the total path traveled, while displacement is the shortest straight-line distance from the starting point to the ending point.

Displacement is always greater than distance.

Distance considers direction, while displacement does not.

Distance is measured in meters, while displacement is measured in kilometers.

If a person walks 3 km east and then 4 km west, how would you describe the relationship between distance and displacement?

Distance is 7 km, and displacement is 1 km.

Distance is 7 km, and displacement is 7 km.

Distance is 1 km, and displacement is 7 km.

Distance and displacement are the same in this scenario.

A delivery driver travels 5 km north, 3 km east, and 5 km south. What is the driver’s total distance traveled and displacement?

Distance is 13 km, displacement is 3 km.

Distance is 8 km, displacement is 3 km.

Distance is 8 km, displacement is 5 km.

Distance is 13 km, displacement is 5 km.

A person walks from Point A to Point B, which is 4 km east, and then to Point C, which is 3 km north of Point B. Analyze the motion. What is the total distance traveled and the displacement?

Distance is 7 km, displacement is 5 km.

Distance is 7 km, displacement is 7 km.

Distance is 5 km, displacement is 7 km.

Distance is 5 km, displacement is 5 km.

What is the primary difference between speed and velocity?

Speed is a scalar quantity, while velocity is a vector quantity.

Speed measures displacement, while velocity measures distance.

Speed is always positive, while velocity is always negative.

Speed includes direction, while velocity does not.

If a car is traveling at 60 km/h in a straight line to the east, what is true about its speed and velocity?

Speed and velocity have the same magnitude and direction.

Speed is zero, but velocity is 60 km/h east.

Speed and velocity have different magnitudes but the same direction.

Speed has magnitude and direction, while velocity only has magnitude.

A cyclist travels 5 km north in 15 minutes, then turns and travels 5 km south in 15 minutes. What is the cyclist’s average speed and average velocity for the entire trip?

Average speed: 20 km/h, Average velocity: 0 km/h

Average speed: 10 km/h, Average velocity: 0 km/h

Average speed: 10 km/h, Average velocity: 20 km/h

Average speed: 20 km/h, Average velocity: 10 km/h north

A runner completes a straight 100 m sprint in 10 seconds and then walks back to the starting point in 40 seconds. Analyze the motion. What is the difference between the runner's average speed and average velocity for the entire trip?

Average speed is 2.5 m/s, and average velocity is 0 m/s.

Average speed and average velocity are both 2.5 m/s.

Average speed is 5 m/s, and average velocity is 0 m/s.

Average speed is 5 m/s, and average velocity is 2.5 m/s.

What does uniform velocity mean?

An object moves with constant speed in a straight line.

An object moves with increasing speed over time.

An object moves with varying speed in a straight line.

An object moves in a circular path with constant speed.

In a distance-time graph for an object moving with uniform velocity, how does the graph look?

A straight line with a constant positive slope.

A straight line with a changing slope.

An object is moving with a uniform velocity of 10 m/s. How far will it travel in 5 seconds, and how would this be represented on a distance-time graph?

The object travels 50 m, and the graph is a straight line with a constant slope.

The object travels 5 m, and the graph is a straight line with a constant slope.

The object travels 5 m, and the graph is a horizontal line.

The object travels 50 m, and the graph is a curved line.

Two objects, A and B, move with uniform velocities, but A's distance-time graph has a steeper slope than B's graph. What can you infer about their velocities?

Object A has a higher velocity than Object B.

Object B has a higher velocity than Object A.

Both objects have the same velocity since they move uniformly.

The velocity of each object cannot be determined from the slope of the graph.

What is the main difference between heat and temperature?

Heat is the transfer of thermal energy, while temperature is a measure of the average kinetic energy of particles.

Heat is the energy stored in an object, while temperature is the total energy of all particles.

Heat is measured in Kelvin, while temperature is measured in Joules.

Heat and temperature are the same physical quantity.

You have two metal blocks made of the same material. One block has a mass of 5 kg, and the other has a mass of 10 kg. Both are heated to the same temperature. Which statement best explains the difference in heat energy between the two blocks?

The larger block contains more heat energy.

Heat energy is independent of mass.

The smaller block contains more heat energy.

Both blocks contain the same amount of heat energy.

A metal rod and a wooden block are at the same temperature, but the metal rod feels hotter to the touch. Why?

The metal rod transfers heat more efficiently to your hand due to its higher thermal conductivity.

The wooden block has more heat energy than the metal rod.

The metal rod has less thermal energy than the wooden block.

The metal rod has a higher temperature than the wooden block.

If you heat 1 liter of water and 2 liters of water to the same temperature, which of the following is true?

The 2 liters of water have more heat energy because it contains more particles.

Both have the same amount of heat energy.

The 1 liter of water has more heat energy because it is smaller.

Neither contains any heat energy, as they have the same temperature.

Two objects of the same material and mass are heated. One increases in temperature by 20°C, and the other increases by 40°C. Analyze the heat transfer in this situation. Which of the following is correct?

The object with the 40°C increase absorbed twice as much heat as the other.

Both objects absorbed the same amount of heat energy.

The heat absorbed is independent of temperature change.

The heat absorbed depends only on the mass, not the temperature change.

How would you explain the transfer of heat from water to the spoon?

Heat is moving from the hotter object to a cooler object

Metal has a closely packed atoms that allows the transfer of energy from one to another

Hot object has direct contact with the cooler object

Hot water rises and reaches a uniform temperature

Which heating method—conduction, convection, or radiation—is least efficient in keeping a hot beverage warm, and why?

Convection, because it creates air currents that carry heat away from the surface.

Conduction, because it only works in solids.

Radiation, because it loses energy in all directions, even in a vacuum.

Conduction, because it transfers heat away to the surrounding container.

The best way to manage convection and lower the energy required to cool the house is to do one of the following.

Proper roof insulation creates a barrier that slows down the heat flow.

Large, well-placed windows are the most effective way to introduce natural light.

Ceiling fans can circulate warm air in cold weather (by reversing the fan direction) and cool air in summer

Solar energy provides free energy from the sun, reducing dependence on energy sources like natural gas, electricity, or oil.

Which heating method—conduction, convection, or radiation—is least efficient in keeping a hot beverage warm, and why?

Convection, because it creates air currents that carry heat away from the surface.

Conduction, because it transfers heat away to the surrounding container.

Radiation, because it loses energy in all directions, even in a vacuum.

Conduction, because it only works in solids.

Design an effective way to reduce heat loss in a home. Which combination of strategies addresses conduction, convection, and radiation?

Use reflective materials on walls (radiation), seal gaps around windows (convection), and install double-glazed windows (conduction).

Insulate walls with thick fabric (conduction), use a fan to circulate air (convection), and place metallic foil inside walls (radiation).

Paint walls a darker color (radiation), leave windows open (convection), and use single-pane glass (conduction).

Allow air circulation (convection), avoid reflective surfaces (radiation), and use metal walls (conduction).

What happens to particles during conduction in a solid?

Particles vibrate and pass kinetic energy to neighboring particles.

Particles move freely to transfer heat.

Particles radiate heat in the form of waves.

Particles expand and rise, creating a current.

Why does a metal spoon placed in hot soup feel warm at the other end after a while?

The particles in the spoon vibrate and transfer energy to neighboring particles by conduction.

Particles of heat travel through the spoon.

The spoon emits radiation, which heats it uniformly.

The soup creates a convection current in the spoon.

Explain why warm air rises and cool air sinks in a room heated by a radiator.

The warm air becomes less dense, rises, and cooler air moves down to replace it, creating a convection current.

The warm air becomes denser and moves upward, while cooler air becomes lighter and sinks.

The particles in warm air stop moving, causing the cooler air to sink.

The particles in warm air slow down, reducing the density of the air.

Evaluate which is more efficient for heating a room and explain why: a radiant heater or a convection heater.

A convection heater is more efficient because it heats the air, creating a uniform temperature in the room.

A radiant heater is more efficient because it heats the air evenly in all directions.

Both are equally efficient, as they use the same particle processes to transfer heat.

A radiant heater is more efficient because it directly transfers heat to objects and people in its path.

How do thermoelectric generators transform heat into electricity?

By creating a temperature gradient across thermoelectric materials, which generates an electric current

By using heat to spin a turbine connected to an electrical generator

By heating a liquid that expands and drives a piston to produce electricity

By using electromagnetic induction to directly convert heat into an electric field

A researcher is comparing two innovative devices for converting heat energy into electricity: a thermoelectric generator and a heat engine. The thermoelectric generator directly converts a temperature difference into electrical energy, while the heat engine uses heat to drive a mechanical process. Which of the following is a key advantage of thermoelectric generators overheating engines?

Thermoelectric generators have no moving parts, making them more reliable and suitable for small-scale applications.

Thermoelectric generators are more efficient than heat engines in all cases.

Thermoelectric generators produce more energy than heat engines under the same conditions.

Thermoelectric generators require a larger temperature difference than heat engines to operate effectively.

SCIENCE

Authored by Hermi Taulo

Other

6th - 8th Grade

Used 2+ times

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50 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the SI unit of force?

Joule

Newton

Pascal

Watt

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following best explains the force of friction?

A force that always acts upward.

A force that opposes the motion of an object.

A force that only acts in the direction of motion.

A force that is independent of surfaces in contact.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A car of mass 1,000 kg accelerates at 2 m/s². What is the net force acting on the car?

500 N

1,000 N

2,000 N

5,000 N

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following scenarios involves both contact and non-contact forces?

A book resting on a table.

A ball being thrown upward.

A car moving on a rough road.

A magnet attracting a piece of iron.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which statement about gravitational and magnetic forces is more accurate?

Both forces can only act when objects are in direct contact.

Gravitational forces are generally stronger than magnetic forces.

Gravitational forces depend on mass, while magnetic forces depend on charge or material.

Magnetic forces only act over small distances, but gravitational forces act over infinite distances.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following is an example of balanced forces?

A fruit falling from a tree

A person jumping into the air

A box resting on a flat surface

A car accelerating on a highway

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Why does an object moving with constant velocity demonstrate balanced forces?

Because no forces are acting on the object

Because only unbalanced forces can act on moving objects

Because the force of gravity is greater than any opposing force

Because all the forces acting on the object are equal and cancel out

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SCIENCE

What is the SI unit of force?

Which of the following best explains the force of friction?

A car of mass 1,000 kg accelerates at 2 m/s². What is the net force acting on the car?

Which of the following scenarios involves both contact and non-contact forces?

Which statement about gravitational and magnetic forces is more accurate?

Which of the following is an example of balanced forces?

Why does an object moving with constant velocity demonstrate balanced forces?

A man pushes a box with a force of 100 N to the right, and friction exerts a force of 100 N to the left. What will happen to the box?

Some fruit falls freely from a tree. Which force is acting unbalanced on the fruit?

A car is accelerating on a straight road. Analyze the forces acting on the car. Which of the following is true?

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