Gr 9 NATURAL SCIENCES: CH 3.1 Contact forces

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What is the net force calculated as when pushing a go-cart with forces of 7 N and 10 N forward, and friction of 5 N?

(7 N + 10 N) + 5 N

(7 N - 10 N) + 5 N

(7 N - 10 N) - 5 N

(7 N + 10 N) - 5 N (correct)

What is the purpose of friction between car tires and the road?

To improve the fuel efficiency of the car

To reduce the air resistance on the car

To increase the speed of the car

To prevent skidding (correct)

What type of force occurs when an object is being pulled by forces acting from opposite ends?

Normal Force

Tension (correct)

Compression

Friction

What is an example of compression force?

Crushing a ball of dough Signup and view all the answers

What type of forces do bridges experience due to the weight of vehicles passing over them?

Both compression and tension Signup and view all the answers

What is the force that occurs when an object is being squashed or deformed by forces acting towards each other?

Compression Signup and view all the answers

What is the purpose of the normal force?

To support the weight of an object Signup and view all the answers

What type of forces are friction, normal force, tension, and compression?

Contact forces Signup and view all the answers

What is the primary characteristic of contact forces?

They occur between objects that are physically touching each other Signup and view all the answers

What is the direction of frictional force in relation to an object's motion?

In the opposite direction to the motion Signup and view all the answers

What is the normal force acting on an object that rests on a flat surface?

A force perpendicular to the surface, equal in magnitude but opposite in direction to the weight of the object Signup and view all the answers

What is the relationship between friction and normal force?

Friction depends on the type of surface and the normal force Signup and view all the answers

What is the purpose of the normal force?

To prevent an object from penetrating a surface Signup and view all the answers

What is necessary to move an object?

A force greater than the frictional force Signup and view all the answers

What is the effect of friction on an object's motion?

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

What is the net result of frictional forces in the example of pushing a go-cart?

The go-cart maintains its current velocity. Signup and view all the answers

Which type of force is responsible for preventing skidding when driving a car?

Frictional force Signup and view all the answers

What type of force occurs when a rope is used to pull a block across the floor?

Tension force Signup and view all the answers

What happens to the shape of an object when it is subjected to compression force?

It becomes squashed or deformed. Signup and view all the answers

What type of force is responsible for a tennis ball's deformation when it is squeezed?

Compression force Signup and view all the answers

What type of forces act on a bridge due to the weight of vehicles passing over it?

Both compression and tension forces Signup and view all the answers

What is the difference between contact and non-contact forces?

Contact forces act with physical contact, while non-contact forces act without physical contact. Signup and view all the answers

What is the purpose of exploring the different types of forces in physics?

To understand the causes of object motion. Signup and view all the answers

What is the direction of frictional force?

Opposite to the direction of an object's motion Signup and view all the answers

What is the purpose of the normal force?

To prevent penetration of an object into the surface Signup and view all the answers

Which of the following is a factor affecting friction?

The normal force on an object Signup and view all the answers

What happens when a force greater than the frictional force is applied to an object?

The object begins to move Signup and view all the answers

What is the relationship between the normal force and the weight of an object on a flat surface?

The normal force is equal in magnitude but opposite in direction to the weight of the object Signup and view all the answers

What is the force that opposes motion between two surfaces in contact?

Friction Signup and view all the answers

What is the result of friction on an object's motion?

The object decelerates Signup and view all the answers

What is the effect of the normal force on the motion of an object on a flat surface?

It has no effect on the motion of the object. Signup and view all the answers

Which of the following is NOT a factor that affects the amount of friction between two surfaces?

The colour of the objects. Signup and view all the answers

What is the minimum force required to move an object that is in contact with a surface?

A force greater than the frictional force. Signup and view all the answers

In a free-body diagram of an object on a flat surface, what is the direction of the normal force?

Perpendicular to the surface. Signup and view all the answers

What is the relationship between the normal force and the frictional force?

The frictional force depends on the type of surface and the normal force. Signup and view all the answers

What is the result of applying a force less than the frictional force to an object?

The object will not move. Signup and view all the answers

What is the primary characteristic of contact forces?

They require physical contact between objects. Signup and view all the answers

In the example of pushing a go-cart, what is the net force acting on the go-cart due to?

The combined effect of the forces pushing it forward and friction Signup and view all the answers

Which of the following is a common result of compression force?

Squashing or deforming of an object Signup and view all the answers

What is the primary difference between tension and compression forces?

Tension occurs when an object is being pulled, while compression occurs when an object is being squashed Signup and view all the answers

Why do bridges experience both compression and tension due to the weight of vehicles passing over them?

Because the weight of the vehicles is transferred to the pillars, causing compression, and to the cables, causing tension Signup and view all the answers

What is a common characteristic of all contact forces?

They require physical contact between objects Signup and view all the answers

What is the purpose of exploring the different types of forces in physics?

To understand the characteristics and effects of different types of forces Signup and view all the answers

What determines the magnitude of the frictional force?

The normal force between the objects Signup and view all the answers

What is the relationship between the net force and an object's motion?

An object will move in the direction of the net force Signup and view all the answers

Gr 9 NATURAL SCIENCES: CH 3.1 Contact forces

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Questions and Answers

What is the net force calculated as when pushing a go-cart with forces of 7 N and 10 N forward, and friction of 5 N?

What is the purpose of friction between car tires and the road?

What type of force occurs when an object is being pulled by forces acting from opposite ends?

What is an example of compression force?

What type of forces do bridges experience due to the weight of vehicles passing over them?

What is the force that occurs when an object is being squashed or deformed by forces acting towards each other?

What is the purpose of the normal force?

What type of forces are friction, normal force, tension, and compression?

What is the primary characteristic of contact forces?

What is the direction of frictional force in relation to an object's motion?

What is the normal force acting on an object that rests on a flat surface?

What is the relationship between friction and normal force?

What is the purpose of the normal force?

What is necessary to move an object?

What is the effect of friction on an object's motion?

What is the net result of frictional forces in the example of pushing a go-cart?

Which type of force is responsible for preventing skidding when driving a car?

What type of force occurs when a rope is used to pull a block across the floor?

What happens to the shape of an object when it is subjected to compression force?

What type of force is responsible for a tennis ball's deformation when it is squeezed?

What type of forces act on a bridge due to the weight of vehicles passing over it?

What is the difference between contact and non-contact forces?

What is the purpose of exploring the different types of forces in physics?

What is the direction of frictional force?

What is the purpose of the normal force?

Which of the following is a factor affecting friction?

What happens when a force greater than the frictional force is applied to an object?

What is the relationship between the normal force and the weight of an object on a flat surface?

What is the force that opposes motion between two surfaces in contact?

What is the result of friction on an object's motion?

What is the effect of the normal force on the motion of an object on a flat surface?

Which of the following is NOT a factor that affects the amount of friction between two surfaces?

What is the minimum force required to move an object that is in contact with a surface?

In a free-body diagram of an object on a flat surface, what is the direction of the normal force?

What is the relationship between the normal force and the frictional force?

What is the result of applying a force less than the frictional force to an object?

What is the primary characteristic of contact forces?

In the example of pushing a go-cart, what is the net force acting on the go-cart due to?

Which of the following is a common result of compression force?

What is the primary difference between tension and compression forces?

Why do bridges experience both compression and tension due to the weight of vehicles passing over them?

What is a common characteristic of all contact forces?

What is the purpose of exploring the different types of forces in physics?

What determines the magnitude of the frictional force?

What is the relationship between the net force and an object's motion?

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