ForcesGR5

Which of the following is an example of non-contact force?

• Frictional force

• Magnetic force

• Tension force

• Spring force

Which of the following is an example of balanced forces?

• A ball rolling down a hill

• A bus moving at a constant speed to the same direction

• A car accelerating from rest

• A bird flying in the air

Which of the following can be used to reduce friction?

• Rough surfaces

• Oiling the surface

• Using heavier objects

• Reducing the force applied

Air resistance is a kind of:

• Magnetic force

• Gravitational force

• Tension force

• Frictional force

Which of the following factors does not affect the air resistance?

• Speed of the body

• Size of the body

• Shape of the body

• Colour of the body

Which of the following is an example of increasing friction?

• Walking on an icy surface

• Wearing smooth-soled shoes

• Using a treaded tyre on a car

• Using lubricants on a surface

What is the direction of the frictional force?

• In the direction of motion

• In the opposite direction of motion

• Perpendicular to the direction of motion

• None of these

What happens to the speed of a body when the air resistance increases?

• It increases

• It decreases

• It remains constant

• It cannot be determined

Which of the following is an example of a contact force?

• Magnetic force

• Gravitational force

• Electrostatic force

• Frictional force

What is the purpose of making ships and aeroplanes streamlined?

• To increase air resistance

• To reduce air resistance

• To increase the gravitational force

• To increase the frictional force