unit 7 -- intro to work

Multiple Choice

What is the unit for energy?

• Newton

• meter

• speed

• joule

Multiple Choice

How much work is done by the robot if it applies a force of 200 N on the box and moves it 35 meters?

• 7000 meters

• 7000 N

• 7000 J

Multiple Choice

What is required in the physics definition of work?

• the force must be strong enough to use energy

• the object must move in the direction of the force

• the object must remain stationary

• the force must be measured in joules

Multiple Choice

Which forces do not do any work on the crate?

• friction and tension

• friction and air resistance

• normal force and weight

• weight and gravity

Multiple Choice

Which force does positive work on the crate?

• normal force

• friction

• weight

• tension

Multiple Choice

Why does friction do negative work on the crate?

• because this force acts in the opposite direction of the movement

• because it does not stop the crate

• because it does no work on the crate

• because it changes in different amounts of gravity

Drag and Drop

All physical changes are due to changes in ​ ​

Placeholder

Drag these tiles and drop them in the correct blank above

energy

weight

light

newtons

Multiple Choice

If 100 N of force is applied to the box as shown in the picture, how much work is done on the box?

• 1500 J

• 1500 N

• 1299.03 J

• 25.8 J