Force & Motion

What best describes what forces do?

• They make things speed up, slow down, or change directions
• They only start things moving
• They only stop things moving
• They have no effect on objects

Predict what would happen to the Moon if Earth’s gravity did not act on the moon?

• The moon would fly off into space in a straight line
• The moon would crash into Earth
• The moon would weigh more than it does
• The moon would orbit the Earth faster

An object is moving at a constant speed. The object changes direction & continues moving at the same speed. What caused the object to change direction?

• Inertia & gravity 
• Momentum 
• Change in speed 
• An outside force acted upon it

Tags

NGSS.MS-PS2-2

A soccer player kicks a ball toward the goalie. The goalie kicks the ball & sends it flying away from the goal. What caused the object to change directions? 

• The acceleration of the kicker
• The force of the goalie
• The mass of the ball
• The inertia of the kicker

Why can an astronaut jump higher on the moon than on Earth?

• There is less gravitational pull on the moon, making their weight lighter
• There is more gravitational pull on the moon, making their weight greater

A truck is moving at a speed 25 mph. It's speed then increases to 35 mph. What must be true of the car? 

• It's direction of travel changed 
• It's velocity decreased
• It's mass increased
• It accelerated

When a car started going faster, what causes the increase in speed?

• Speed made it go faster
• Velocity made it go faster
• An outside force made it go faster
• Inertia made it go faster

TJ is pushing a shelf across the floor to move to the other side of the room. Mac decides to help him. What is the result? 

• Friction is reduced by half
• The box moves faster
• The mass of the box decreases
• The box has less inertia

If I caused two grocery carts, a heavy, full cart and an empty, light cart to move with the same push, what would be the effect?

• They would travel the same distance
• The heavy cart would travel a shorter distance than the light weight cart
• The heavy cart would travel further than a light weight cart
• The carts will not stop moving

What would happen to the speed of the cart that’s moving when mass is added? 

• The cart would slow down 
• The cart would speed up
• The speed would not change
• The cart would stop moving