Force Work

Identify the simple machine

• Wheel and axle

• Lever

• Pulley

• Wedge

Work is done only when a force moves an object over a distance.

• True

• False

What will happen to the book if no other forces act upon it?

• book will stay at rest

• book will begin to move

• mass of the book will increase

• gravity on the book will increase

Tags

NGSS.MS-PS2-2

The picture shows an athlete hitting a ball with a tennis racquet. What is the athlete demonstrating in the picture?

• Doing work by pushing the ball and changing its motion and position

• Changing the position but not the motion of the ball

• Doing work by pulling the racquet and changing the ball's position but not its motion

• Changing the position and motion of the ball without doing any work

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Work is done when opposing forces acting on the same object are

• balanced

• unbalanced

• equal

• created

When would more work be done?

• When an object is stable.

• When an object moves over a short distance

• When the object moved is very heavy

• When the object is very light.

A push or pull that causes an object to move, stop, or change direction.

• force

• friction

• gravity

• weight

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

What kind of energy is in a moving skateboard?

• Potential

• Kinetic

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Which of the following statements is true about work done by a force?

• Work is done only when the force is perpendicular to the direction of motion.

• Work is done only when the force is parallel to the direction of motion.

• Work is done only when the force is at an angle to the direction of motion.

• Work is done only when there is no motion.

A force of 10 N is applied to move a box 5 meters across the floor. How much work is done?

• 50 J

• 5 J

• 15 J

• 500 J

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5