Momentum, Energy, Power and Machines

What is the formula for mechanical advantage?

• MA = Resistance Force / Effort Force
• MA = Length of Effort Arm / Length of Resistance Arm
• MA = Work Input / Work Output
• All of the above

Tags

NGSS.MS-ETS1-1

After a collision, an object moves at 6 m/s at an angle of 45°. If its mass is 4 kg, what are the x and y components of its momentum?

• 12 kg·m/s
• 24 kg·m/s
• 18 kg·m/s
• 30 kg·m/s

Tags

NGSS.HS-PS2-2

What is the angular displacement of a fan blade that rotates at 6 degrees per second for 4 seconds?

• 24 degrees
• 30 degrees
• 36 degrees
• 40 degrees

An objects momentum can be calculated by multiplying the velocity of the object by its_____.

• time
• mass
• acceleration
• length

Tags

NGSS.HS-PS2-2

Which has a greater momentum a semi-truck at rest or a bicycle in motion?

• truck
• bicycle
• neither has momentum
• same

Tags

NGSS.HS-PS2-2

Applying a force for a longer time increases the change in _________.

• mass
• gravity
• momentum
• time

Tags

NGSS.HS-PS2-2

_______ is a change in momentum.

• Impulse
• Gravity
• Mass
• Distance

Tags

NGSS.HS-PS2-2

When a golf club hits a golf ball, the change in momentum of the club is_______the change in momentum of the ball.

• less than
• greater than
• equal to
• none of the answers

Tags

NGSS.HS-PS2-2

The momentum of a 225 g softball moving at 35 m/s is

• 7.9 kg m/s
• 3.5 N
• 5.0 m/s
• 2.1 kg m/s

Tags

NGSS.HS-PS2-2

An 81 kg football player moving 6.5 m/s tackles and collides with a stationary 140 kg football player. What speed will the football players have the moment after impact?

• 0 m/s
• 4.8 m/s
• 2.4 m/s
• 3.8 m/s

Tags

NGSS.HS-PS2-2