Force

What is the unit for FORCE?

• N (Newtons)

• lbs (pounds)

• g (grams)

• m/s (meters per second)

What minimal force must be exerted by a mother to lift her 5kg baby?

• 0 N

• 5 N

• 49 N

• 10 N

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

While decorating her apartment, Becca pushes her 95 kg cabinet across the floor at a constant speed. The coefficient of friction between wood on wood is 0.75. what force must she exert to overcome friction?

• 698.25 N

• 584.67 N

• 1000 N

• 255.98

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

In problem # 3, why would it have been harder just to get the cabinet to move from a standstill?

• because the static coefficient of friction is greater than the sliding coefficient of friction.

• because the sliding coefficient of friction is greater than the static coefficient of friction.

• because Becca is stringer when she is standing still.

• because it is easier to push things across wood than it is to push things across carpet.

Tags

NGSS.MS-PS2-2

In the district finals, Vanessa kicks the 0.600 kg soccer ball with a force of 80 N. How much does she accelerate the ball?

• 122 m/s/s

• 50 m/s/s

• 133 m/s/s

• 48 m/s/s

Tags

NGSS.MS-PS2-2

Fernando is walking through the cafeteria but does not realize that the person in front of him has spilled their carton of milk. Fernando's weight is 800 N. He steps in the milk. The coefficient of friction between his shoe and the floor is reduced to 0.035. What is the force of sliding friction?

• 28 N

• 35 N

• 100 N

• 67 N

Tags

NGSS.HS-PS2-1

A 68 kg runner exerts a force of 59 N. What is the acceleration of the runner?

• 9.8 m/s/s

• 5 m/s/s

• 1.968 m/s/s

• 0.868 m/s/s

Tags

NGSS.MS-PS2-2

A crate is dragged across an ice covered lake. The box accelerates at 0.08 m/s/s and s pulled by a 47 N force. What is the mass of the crate?

• 587.5 kg

• 642.8 kg

• 58.75 kg

• 98.81 kg

Tags

NGSS.MS-PS2-2

3 women push a stalled car. Each woman pushes with a force of 425 N. What is the mass of the car if it accelerates at 0.85 m/s/s?

• 2500 kg

• 1500 kg

• 900 kg

• 425 kg

Tags

NGSS.MS-PS2-2

I thought that the acceleration of gravity was 9.8 m/s/s. Why does an object dropped from something high up, like from a plane, will reach a point where it won't accelerate anymore (terminal velocity)?

• because objects slow down as they fall.

• because the weight force is greater than the drag force.

• because the drag forces are more than the weight force.

• because the drag forces will balance out the weight.

Tags

NGSS.MS-PS2-2