The motion does not change

The greater the mass, the greater the force necessary

Ice

Friction

The force increases with the increased mass.

Mass and Distance

2J Work = Force x Distance

Make work easier

Ax

Mechanical Advantage = Force out divided by Force in

Mechanical Advantage = Force out divided by Force in. 9N divided by 3N = 3

A. Reduce the amount of work that Is done.

2

The chair pushes on the baby

A. Input force is 40N and work done is 0J. B. Input force is 40N and work done is 600J. C. Output force is 40N and work done is 150J. D. D. Output force is 150N and work is 40J.

A. Input force is 40N and work done is 0J. B. Input force is 40N and work done is 600J. C. Output force is 40N and work done is 150J. D. D. Output force is 150N and work is 40J. A. Input force is 40N and work done is 0J.

Inertia

Acceleration

0.5 m/s

Because the child is constantly changing direction!

A. Gravity causes a net downward force on the block B. B. Gravitational attraction decreases as the block gets closer to the ground. C. C. Gravitational attraction causes the block to accelerate as it falls. D. D. Gravity causes an unbalanced force on the block.

A. Gravity causes a net downward force on the block B. B. Gravitational attraction decreases as the block gets closer to the ground. C. C. Gravitational attraction causes the block to accelerate as it falls. D. D. Gravity causes an unbalanced force on the block. B.

½ x5 kg x (2 m/s) 2 =1/2 x 5kg x 4m/s =1/2 x 20J =10J

Position

Motion

A force

Contact

Reference Point

Gravity

Friction

Relative Motion

Net force

Speed is distance divided by time

A. Increase force B. Decrease force C. Increase mass D. Increase inertia

A. Increase force B. Decrease force C. Increase mass D. Increase inertia A. Increase force

Reference point

Speed = distance divided by time 4 km/h Change the “half an hour” to 0.5 hours.

Size and direction

Newton

a. Zero b. The original momentum of the more massive marble c. The original momentum of the smaller marble d. Twice the momentum of the more massive marble

a. Zero b. The original momentum of the more massive marble c. The original momentum of the smaller marble d. Twice the momentum of the more massive marble B.

A = final velocity – initial velocity divided by m/s/s

The box moves toward John

Large rock, pencil feather, book

Feather, pencil, book, large rock.

a. No acceleration b. Positive acceleration c. Negative acceleration d. Constant velocity

a. No acceleration b. Positive acceleration c. Negative acceleration d. Constant velocity C.

pressure

Pressure = force divided by area

pascal

True

Increasing elevation decreases air pressure Increasing depth increases water pressure

friction

a. Force and speed b. Force and distance c. Energy and time d. Energy and distance

a. Force and speed b. Force and distance c. Energy and time d. Energy and distance B

No. Work requires movement in the direction of the force

a. Force b. Work c. Energy d. power

a. Force b. Work c. Energy d. Power D

Horsepower

They add together

a. Increase mass b. Decrease mass c. Decrease force d. Increase both mass and force proportionally

a. Increase mass b. Decrease mass c. Decrease force d. Increase both mass and force proportionally B

A. Your shoes on the sidewalk while walking. B. Bike tires on the road as you ride C. Ice skates while skating D. Lighting a match

A. Your shoes on the sidewalk while walking. B. Bike tires on the road as you ride C. Ice skates while skating D. Lighting a match B