A see-saw is made by resting a long plank of wood with its centre of gravity on the barrel. A boy sits on one side of the barrel and a girl sits on the other side so that the see-saw is balanced. Which of the following statements must be true?

moments of the girl = moments of the boy

boy’s weight = girl’s weight

moment of the girl > moment of the boy

A nut can be loosened more easily with

a long spanner because a larger turning effect can be produced.

a short spanner because a larger turning effect can be produced.

a long spanner because a larger force can be produced.

a short spanner because a larger force can be produced.

What is the equation for moments?

Moment = force x perpendicular distance from pivot

Moment = force x parallel distance from pivot

When an object is in equilibrium, which equation is true?

Clockwise moment = anticlockwise moment

Clockwise moment + anticlockwise moment = 0

Clockwise moment / anticlockwise moment = 0

Clockwise moment + anticlockwise moment = resultant force

A wheeled cart is moving to the right at a constant speed. Two forces of equal magnitude are acting upon the cart. Which of the following best describes the forces and motion of the cart?

Balanced Forces, Constant Speed

Unbalanced Forces, Constant Speed

Unbalanced Forces, Acceleration

Which is true from Newton's Third law of motion?

For every action force there is an equivalent reaction force in the opposite direction.

For every action force there is a smaller reaction force in the opposite direction.

Forces and Moments

Physics

9th - 11th Grade

NGSS covered

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MULTIPLE CHOICE QUESTION

2 mins • 1 pt

1. A _________is a simple machine with a fulcrum and a rigid bar.

Pivot

Lever

Wedge

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the anticlockwise moment acting on this crane?

80,000Nm

100,000Nm

120,000Nm

140,000Nm

Tags

NGSS.HS-PS2-1

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Unit of force.

Meter

Centimeter

Newton

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the moment acting on the seesaw?

1.6Nm

15Nm

16N

4Nm

Tags

NGSS.HS-PS2-1

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the moment produced by the 15 N?

15 Nm (clockwise)

150 Nm (anti - clockwise)

1.5 Nm (anti - clockwise)

0.15 Nm (clockwise)

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A seesaw is unbalanced with two people of different masses sitting equal distances from the center. Which of the following will result in equilibrium?

The larger person moving further away from the center.

Moving the smaller person closer to the center.

Moving the smaller person further from the center.

Making the larger person do nothing.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The easiest way to open a heavy door is by applying the force

Near the hinges

In the middle of the door

At the edge of the door far from the hinges

At the top of the door

Tags

NGSS.HS-PS2-1

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Forces and Moments

1. A _________is a simple machine with a fulcrum and a rigid bar.

What is the anticlockwise moment acting on this crane?

Unit of force.

What is the moment acting on the seesaw?

What is the moment produced by the 15 N?

A seesaw is unbalanced with two people of different masses sitting equal distances from the center. Which of the following will result in equilibrium?

The easiest way to open a heavy door is by applying the force

A wrench is used to tighten a nut. A 15N perpendicular force is applied 50cm away from the axis of rotation, and moves a distance of 10 cm as it turns. What is the torque applied to the wrench?

This type of force is an attraction between two objects

This type of force resist motion between two surfaces that are pressed together

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