Force and Motion 1 Whole Group

Force, Mass, and Motion

Multiple Choice

What is force?

• a push or a pull.

• something used in Star Wars

• the amount of space between two points.

• the amount of matter in an object.

Multiple Choice

Something with a greater mass requires a(n) _____ force to move it. 

• greater
• lesser
• equal
• opposite

Friction

Friction-a force that slows objects down, when two objects rub together. Example: When you hit the brakes in a car, the friction from the tire causes you to stop moving or slow down.

Inertia

When traveling in a train or any other vehicle, have you noticed how you continue to move forward when it stops. You just experienced INERTIA! Inertia is the tendency of a body to resist a change in motion or rest. When a vehicle stops, you tend to jerk forward before coming to a complete stop. In the same way, you will jerk backwards when the vehicle begins to move.

The phenomenon occurs because of Newton’s First Law of Motion: An object at rest (or motion ) will continue to be in the same state unless acted upon by an external force. Which means objects tend to “keep on doing what they’re doing,” unless disturbed.

Multiple Choice

Why does the seatbelt stop you from going into the windshield of your car?

• Inertia

• Velocity

• Condensation

Multiple Choice

If these boys are pulling with the same amount of force. What will happen?

• The boy in blue will win.

• They will not move at all.

• The boy in red will win.

• Both will fall down.

Multiple Choice

Which term describes the motion of a ball?

• shape

• size

• speed

• weight

Multiple Choice

Four solid balls, each with a different mass, are moving at the same speed. Which ball would require the most force to stop its motion?

• ball with a mass of 5 kg

• ball with a mass of 10 kg

• ball with a mass of 15 kg

• ball with a mass of 20 kg

Multiple Choice

What can cause a moving object to increase its speed in a forward direction?

• a force pushing on the object from the opposite direction
• a force that continually acts on the object in the direction the object is moving
• an increase in the mass of the object
• a decrease in the mass of the object

Multiple Choice

A student uses the same force to launch a golf ball, a ping pong ball, a bowling ball, and a baseball on a track.    Which object will move the fastest?

• The golf ball
• The ping pong ball
• The bowling ball
• The baseball

Multiple Choice

Which best describes the speed of a ball as it is thrown straight up into the air and comes back down?

• The ball goes up at a constant speed, stops, then comes down at a constant speed.

• The ball goes up at a constant speed, stops, and increases speed as it comes down

• The ball goes slower and slower as it goes up, stops, and then goes faster and faster as it comes down.

• The ball goes slower and slower as it goes up, stops, and then comes down at a constant speed.

Multiple Choice

Students investigate force. The masses they used begin at rest on the ramp. The setup he students use is shown. Which change will reduce the amount of force needed to move the masses?

• A. Decrease the height of the ramp

• B. Increase the height of the ramp

• C. Add an additional mass

• D. Pull the spring scale with two hands