Forces

A kid applies a force of 70 N to a ball over 1.1 meters. How much work did he do on the ball? 

• 77 J

• 7.7 J 

• 0.7 J 

• 770 J 

A weightlifter lifts two 300 newton weights 1.5 meters off the ground. How much work has he done?

• 600 J 

• 660 J

• 900 J 

• 1200 J 

When a force causes an object to move in the direction of the force.

Tags

NGSS.MS-PS2-2

The formula for work.

• W=F*d

• W=F/d

• F=W*d

• W=F+d

Label the forces acting in this image.

a

c

d

b

friction

gravity

normal force

applied force

Tags

6-8.AG.7.1

Label the forces acting in this picture.

a

b

c

d

normal

applied force

gravity

tension

Tags

6-8.AG.7.1

Label the forces acting in this picture.

a

b

c

applied

gravity

air resistance

Tags

6-8.AG.7.1

The concept that if a machine makes work easier for you by multiplying the force, you must apply the force input over a longer distance.

• the force-distance tradeoff

• friction

• the Rube-Goldberg Effect

• the law of thermodynamics

• the multiplication principle

Tags

NGSS.MS-PS2-2

The name for the fixed point on a lever.

The type of lever in which the fulcrum and the input forces are on the end and the load is in the middle.

• 2nd class

• 1st class

• 3rd class

• fixed

• movable

Tags

NGSS.MS-PS2-2