page 4 physics text book

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What is a force?

A type of energy

A type of motion

A push or a pull (correct)

A type of speed

What type of force acts perpendicular to a surface and away from it?

Thrust

Gravity

Reaction force (correct)

Electrostatic force

What is the force that slows down an object?

Drag or air resistance (correct)

Tension

Thrust

Lift

What type of force is responsible for the upward motion of an aeroplane?

Lift Signup and view all the answers

What type of force is responsible for the motion of a rocket?

Thrust Signup and view all the answers

What is the force that holds a rope or cable taut?

Tension Signup and view all the answers

What is the force that opposes motion?

Friction Signup and view all the answers

What happens to an object with no force propelling it along?

It decelerates Signup and view all the answers

Why do objects with weight not fall through the surface they're on?

Because of a reaction force Signup and view all the answers

What is the force that acts in the opposite direction to an object's motion in a fluid?

Drag Signup and view all the answers

What is required to maintain a steady speed?

A driving force Signup and view all the answers

Why does an object slow down and stop if it has no force propelling it?

Because of friction Signup and view all the answers

What is the purpose of a driving force when an object travels at a steady speed?

To counteract friction Signup and view all the answers

What is the result of friction between solid surfaces?

Wear of the surfaces in contact Signup and view all the answers

How can friction between solid surfaces be reduced?

By using a lubricant Signup and view all the answers

What is the most important factor in reducing drag in fluids?

The shape of the object Signup and view all the answers

What type of friction occurs when an object moves in a fluid?

Drag Signup and view all the answers

What is the main purpose of deflectors on lorries and caravans?

To reduce drag and make the vehicle more streamlined Signup and view all the answers

What happens to friction in a fluid as the speed increases?

It increases Signup and view all the answers

What is the opposite extreme to a sports car in terms of drag?

A parachute Signup and view all the answers

What is the purpose of a lubricant like oil or grease between two solid surfaces?

To reduce friction Signup and view all the answers

What is the main way to reduce drag in fluids?

By keeping the shape of the object streamlined Signup and view all the answers

What is the effect of a roof box on a car?

It decreases the car's speed Signup and view all the answers

What is the result of high drag on an object?

Lower top speed Signup and view all the answers

What is the relationship between drag and top speed for a given thrust?

Higher drag results in lower top speed Signup and view all the answers

What is the purpose of deflectors on lorries and caravans?

To reduce drag Signup and view all the answers

What is an example of an object with high drag?

Parachute Signup and view all the answers

What happens to the surfaces in contact when friction occurs?

They wear out Signup and view all the answers