Force and Motion Review

Front

What is friction and how does it affect motion on surfaces like snow-covered highways?

Back

Friction is a force that opposes the relative motion of two surfaces in contact. On snow-covered highways, increasing friction (e.g., by adding sand) can help vehicles maintain traction and prevent slipping.

Front

Describe the motion of a ball thrown straight up into the air and its speed changes.

Back

As the ball is thrown up, it slows down due to gravity until it reaches its highest point (where its speed is zero), and then it accelerates downwards, speeding up as it falls back to the ground.

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Front

How does reducing friction, such as oiling a bicycle chain, affect the ease of pedaling?

Back

Reducing friction on the bicycle chain allows for smoother movement of the gears and wheels, making it easier to pedal.

Front

When comparing two toy cars pushed with the same force, what factors determine which car travels faster?

Back

The mass of the toy car affects its acceleration; a lighter car (e.g., 15 grams) will accelerate faster than a heavier car when the same force is applied.

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Front

How does a plane's mass affect its speed during flight?

Back

A plane with a lower mass (e.g., after delivering bags) will require less force to maintain or increase its speed, allowing it to travel faster.

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Front

What is the relationship between mass and acceleration according to Newton's second law of motion?

Back

Newton's second law states that acceleration is directly proportional to the net force acting on an object and inversely proportional to its mass (F=ma). This means that for a given force, a lighter object will accelerate more than a heavier one.

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Front

What role does gravity play in the motion of objects?

Back

Gravity is a force that pulls objects toward the center of the Earth, affecting their motion by accelerating them downwards.

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Front

Explain how surface texture can influence friction. Give an example.

Back

Surface texture affects the amount of contact between two surfaces, influencing friction. For example, a rough surface has higher friction than a smooth surface.

Front

What is the effect of increasing the force applied to an object on its motion?

Back

Increasing the force applied to an object will increase its acceleration, causing it to move faster.

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Front

How does the concept of inertia relate to an object's motion?

Back

Inertia is the tendency of an object to resist changes in its state of motion. An object at rest will stay at rest, and an object in motion will continue in motion unless acted upon by an external force.

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