Forces and Newton's Second Law

What happens when unbalanced forces act on an object at rest?

• the object remains at rest

• the object begins moving in an unpredictable direction

• the object begins moving in the direction of the net force

• the object begins moving opposite to the direction of net force

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

How much force is needed to accelerate a 2 kg physics book to an acceleration of 6 m/s/s?

• 36 N

• 12 N

• 3 N

• 0.33 N

Tags

NGSS.MS-PS2-2

Why would one ball accelerate more than the other when pushed with the same amount of force?

• Different weights

• Different forces

• Different masses

• Different sizes

Tags

NGSS.MS-PS2-2

Jenny applies a 60 N force to a 20 Kg cart, what is the acceleration of the cart if friction can be neglected?

• 1200 m/s²

• 0.33 m/s²

• 20 m/s²

• 3 m/s²

Tags

NGSS.MS-PS2-2

Newton's 2nd Law says that force = mass x acceleration. If you throw a tennis ball with more force, acceleration ​ (a)   .

• increases

• decreases

• stays the same

• divides in half

• triples

Tags

NGSS.MS-PS2-2

using the same force on different objects with different masses, the object with less mass

• will accelerate quicker

• will accelerate slower

• will not move

• will accelerate at the same speed

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which soccer ball(s) experienced the strongest force? How do you know?

• All three soccer balls experienced the same force because they changed speed by the same amount.

• The orange soccer ball; it has more mass and the fastest ending speed.

• The blue soccer ball; it takes a stronger force to slow down a more massive object than to speed it up.

• The blue and orange soccer balls; they have more mass than the black soccer ball, but changed speed by the same amount.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS3-1

In an experiment over force, four different students each push one of the boxes below. If each student pushes with the same amount of force, what would be the order of greatest acceleration to least acceleration for the boxes being pushed? Greatest acceleration ​ (a)   ​ ​ ​ ​ (b)   ​ (c)   ​ ​ (d)   Least acceleration

• Box 3

• Box 1

• Box 4

• Box 2

Tags

NGSS.MS-PS2-2

Look at the picture of a person about to kick a soccer ball. Then drag and drop the pins to correctly complete Newton’s Second Law as it is being applied to the soccer ball.​ ​ ​ ​

---

​ (a)   ​ ​ ​ ​ (b)   Mass ​ ​ (c)   ​ ​ ​ ​ (d)   ​

• Force

• Acceleration

• =

• X

• /

Tags

NGSS.MS-PS3-1

Three toy boats with the same mass were in a lake. Two boats were moving and one was stopped. Each boat got bumped by another boat, but not in the same direction. All the boats changed speed as a result of being bumped. Use the information in the diagram to answer. Which toy boat(s) experienced the strongest force when it was bumped? How do you know?

• The blue toy boat experienced the strongest force because it takes a stronger force to slow something down than it takes to speed something up.

• The gray toy boat experienced the strongest force because it had the fastest ending speed.

• The orange and gray toy boats experienced the strongest forces because they both gained the same force as they sped up. The blue boat lost force, so it slowed down.

• All three toy boats experienced the same strength force because they changed speed by the same amount.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2